PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
Technical Specificaitons for Terminal
Equipment for Connection to Public
Switched Telephone Network
NATIONAL COMMUNICATIONS COMMISSION
1
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
Technical Specificaitons for Terminal Equipment for Connection to Public
Switched Telephone Network
CONTENTS
Catalog ...........................................................................................................................................................2
1、Scope...........................................................................................................................................................................5
1.1 Accordance .......................................................................................................................................................5
1.2 Application .........................................................................................................................................................5
2、Definition、Symbols and Abbreviations ....................................................................................................................9
2.1 Definition ..........................................................................................................................................................9
2.2 Symbols ...........................................................................................................................................................10
2.3 Abbreviations...................................................................................................................................................10
3、EMC Requirement ....................................................................................................................................................10
4、Safety Requirement ................................................................................................................................................... 11
5、Telecommunication requirement ............................................................................................................................... 11
5.1 Public switch telephone network interface requirement .................................................................................. 11
5.1.1 Basic requirement .................................................................................................................................... 11
5.1.2 Surge Protection....................................................................................................................................... 11
5.1.2.1 Telephone Line Surge Test: ..............................................................................................................12
5.1.2.1.1 Metallic Surge Test ...................................................................................................................12
5.1.2.1.2 Longitudinal Surge Test ...........................................................................................................12
5.1.2.2 AC Power Line Surge Test ...............................................................................................................13
5.1.3 Line Polarity ............................................................................................................................................14
5.1.4 Leakage current limitations .....................................................................................................................14
5.1.5 Insulation resistance .................................................................................................................................15
5.1.6 Characteristics of TE for ringing signals .................................................................................................16
5.1.6.1 Response to ringing signal ...............................................................................................................16
5.1.6.2 Ringing Impedance ..........................................................................................................................17
5.1.6.3 On-hook AC impedance ...................................................................................................................17
5.1.7 Off-hook DC resistance ...........................................................................................................................19
5.1.8 Sending level limitations of signals .........................................................................................................20
5.1.9 Transverse balance limitations .................................................................................................................21
5.1.10 Return loss .............................................................................................................................................23
5.1.11 Pulse dialing ...........................................................................................................................................23
5.1.12 Dual tone multiple frequency (DTMF) dialing ......................................................................................25
5.1.12.1 Frequency combination ..................................................................................................................25
5.1.12.2 Signaling level ...............................................................................................................................26
5.1.12.3 Signaling level difference.........................................................................................................26
5.1.13 Series
2
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
equipment ……………………………………………………………………………………..............28
5.1.13.1 DC voltage drop of series equipment .............................................................................................28
5.1.13.2 Insertion loss of series equipment ..................................................................................................29
5.2 Handset function..............................................................................................................................................30
5.2.1 Transmission objective reference equivalent ...........................................................................................30
5.2.1.1 Sending objective reference equivalent (According to OREM-A specification) .............................30
5.2.1.2 Receiving objective reference equivalent (According to OREM-A specification) ..........................31
5.2.2 Transmission characteristics frequency response ....................................................................................32
5.2.2.1 Sending frequency response (According to OREM-A specification) ..............................................32
5.2.2.2 Receiving frequency response (According to OREM-A specification) ...........................................32
5.2.3 Side-tone objective reference equivalent (OREM-A method) .................................................................34
5.2.4 Distortion .................................................................................................................................................35
5.2.4.1 Sending distortion ............................................................................................................................35
5.2.4.2 Receiving distortion (According to OREM-A specification) ...........................................................36
5.2.5 Receiver volume control ..........................................................................................................................37
5.2.6 Continuous sound pressure level of receiver ...........................................................................................37
5.3 Cordless Phone function in connecting to PSTN.............................................................................................38
5.3.1 Radio frequency requirement ...................................................................................................................38
5.3.2 Security code requirement .......................................................................................................................39
5.3.3 Transmitter requirement ...........................................................................................................................39
5.3.3.1 Carrier frequency .............................................................................................................................39
5.3.3.2 Modulation sensitivity…….. ............................................................................................................40
5.3.3.3 Audio distortion ...............................................................................................................................40
5.3.4 Receiver requirement ...............................................................................................................................41
5.3.4.1 Useable sensitivity ...........................................................................................................................41
5.3.4.2 Useable bandwidth ...........................................................................................................................42
5.3.4.3 Audio distortion ...............................................................................................................................42
5.3.4.4 Signal and noise ratio .......................................................................................................................43
5.3.4.5 Adjacent channel rejection ...............................................................................................................43
5.3.4.6 Spurious response rejection .............................................................................................................44
5.3.5 Radiated Field Intensity and Interference Test.........................................................................................45
5.4
Transmission characteristics of public automatic switching exchange .........................................................46
5.4.1 General function ......................................................................................................................................46
5.4.1.1 AC Power Failure .............................................................................................................................46
5.4.1.2 Release of the PSTN Line ................................................................................................................46
5.4.2 Quiescent state noise ................................................................................................................................47
5.4.3 Transmission Loss ...................................................................................................................................48
5.4.4 Cross talk .................................................................................................................................................49
3
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
5.5 Protocol requirement… ………………………………………………………………………………….….49
5.6 Caller ID requirement… …………………………………………………………………………………….50
5.6.1 FSK signals inspection standard ..............................................................................................................50
5.6.1.1 AC / DC Termination .......................................................................................................................50
5.6.1.1.1DC Termination .........................................................................................................................50
5.6.1.1.2 AC Termination ........................................................................................................................50
5.6.1.2 Timing ..............................................................................................................................................51
5.6.1.2.1 Alerting case .............................................................................................................................51
5.6.1.2.2 Start Time .................................................................................................................................52
5.6.1.2.3 End Time ..................................................................................................................................52
5.6.1.3 Signaling case ..................................................................................................................................53
5.6.1.3.1 Frequency, Level, Twist and Interference tolerance .................................................................53
5.6.1.4 Packet case .......................................................................................................................................53
5.6.1.4.1 Channel seizure ........................................................................................................................53
5.6.1.4.2 Mark .........................................................................................................................................54
5.6.1.4.3 Message type ............................................................................................................................54
5.6.1.4.4 Checksum .................................................................................................................................54
5.6.1.5 Presentation layer messages case .....................................................................................................55
5.6.2 DTMF signaling Test criteria ...................................................................................................................56
5.6.2.1 DC resistance in the NIT state .........................................................................................................56
5.6.2.2 Leaving the NIT state .......................................................................................................................56
5.6.2.3 DTMF signaling ...............................................................................................................................57
5.6.2.4 DTMF Code / Number .....................................................................................................................58
5.6.2.5 Guarding against interference from the parallel equipment .............................................................58
5.7 Automatic redialing function requirement .......................................................................................................59
5.7.1 Automatic dialing function requirement ..................................................................................................59
5.7.1.1 Automatic repeated call attempts .....................................................................................................59
5.7.1.2 Disconnection Time of automatic dialing ........................................................................................60
5.7.2 Automatic answer function requirement ..................................................................................................60
Appendix I FSK Test Status and Test Data .....................................................................................................................62
Appendix II DTMF Test Status and Test Data ................................................................................................................69
Appendix III Recommentations of Test Environment and Test Equipments ..................................................................70
4
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
1.Scope
1.1 Accordance
The specification is issued pursuant to paragraph 1 of Article 42 of the Telecommunications
Acts.
1.2 Application
This Technical Standard related to Terminal Equipment (TE), Series Equipment or Bridging equipment which
is used in connecting to Public Switched Telephone Network (PSTN). It defines the general technical condition
and requirements for inter-working and non-interference for Customer Equipment connected to PSTN.
The Terminal Equipment is defined in types A to I by their interface types. The following 3 pages is Test
Matrix with the individual types:
A. TE in connecting to PSTN: with Telephone Functions.
B. TE in connecting to PSTN: with Answering Systems Functions.
C. TE in connecting to PSTN: with Cordless Phone Functions.
D. TE in connecting to PSTN: with FAX Machine Functions.
E. TE in connecting to PSTN: with Modem Functions.
F.
TE in connecting to PSTN: with Caller ID Functions.
G. TE in connecting to PSTN: with PBX Functions.
H. TE in connecting to PSTN: with Key System Functions.
I.
TE in connecting to PSTN: Functions other than Typpe A to H.
5
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
Test requirement product types list
Sec.
Titles
A
B
C
D
E
F
G
H
I
3.
EMC requirement
Y
Y
Y
Y
Y
Y
Y
Y
Y
4.
Safety requirement
Y
Y
Y
Y
Y
Y
Y
Y
Y
5.1
Public switch telephone network
Y
Y
Y
Y
Y
Y
Y
Y
Y
interface requirement
5.1.1
Basic requirement
Y
Y
Y
Y
Y
Y
Y
Y
Y
5.1.2
Surge Protection
Y
Y
Y
Y
Y
Y
Y
Y
Y
5.1.2.1
Telephone Line Surge Test
Y
Y
Y
Y
Y
Y
Y
Y
Y
5.1.2.2
AC Power Line Surge Test
※
※
※
※
※
※
※
※
※
5.1.3
Line polarity
Y
Y
Y
Y
Y
Y
Y
Y
Y
5.1.4
Leakage current limitations
Y
Y
Y
Y
Y
Y
Y
Y
Y
5.1.5
Insulation resistance
Y
Y
Y
Y
Y
Y
Y
Y
Y
5.1.6
Characteristics of TE for ringing
Y
Y
Y
Y
Y
Y
Y
Y
Y
signals
5.1.6.1
Response to ringing signal
Y
Y
Y
Y
Y
Y
Y
Y
Y
5.1.6.2
Ringing impedance
Y
Y
Y
Y
Y
Y
Y
Y
Y
5.1.6.3
On-hook AC impedance
Y
Y
Y
Y
Y
Y
Y
Y
Y
5.1.7
Off-hook DC resistance
Y
Y
Y
Y
Y
Y
Y
Y
Y
5.1.8
Sending level limitation of
Y
Y
Y
Y
Y
Y
Y
Y
Y
signals
5.1.9
Transverse balance limitations
Y
Y
Y
Y
Y
Y
Y
Y
Y
5.1.10
Return loss
Y
Y
Y
Y
Y
Y
Y
Y
Y
5.1.11
Pulse dialing
※
※
※
※
※
※
※
※
※
5.1.12
Dual tone multiple frequency (DTMF)
Y
Y
Y
Y
Y
Y
Y
Y
Y
dialing
5.1.12.1
Frequency combination
Y
Y
Y
Y
Y
Y
Y
Y
Y
5.1.12.2
Signaling level
Y
Y
Y
Y
Y
Y
Y
Y
Y
5.1.12.3
Signaling level difference
Y
Y
Y
Y
Y
Y
Y
Y
Y
5.1.12.4
Tone duration
Y
Y
Y
Y
Y
Y
Y
Y
Y
5.1.12.5
Pause duration
Y
Y
Y
Y
Y
Y
Y
Y
Y
5.1.13
Series equipment
※
※
※
※
※
※
※
※
※
5.1.13.1
DC voltage drop of series equipment
※
※
※
※
※
※
※
※
※
5.1.13.2
Insertion loss of series
※
※
※
※
※
※
※
※
※
equipment
6
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
Test requirement product types list
Sec.
Titles
A
B
C
D
E
F
G
H
I
5.2
Handset function
Y
※
※
※
※
※
※
※
※
5.2.1
Transmission objective reference
Y
※
※
※
※
※
※
※
※
Y
※
※
※
※
※
※
※
※
Y
※
※
※
※
※
※
※
※
Y
※
※
※
※
※
※
※
※
equivalent
5.2.1.1
Sending objective reference
equivalent
5.2.1.2
Receiving objective reference
equivalent
5.2.2
Transmission characteristics
frequency response
5.2.2.1
Sending frequency response
Y
※
※
※
※
※
※
※
※
5.2.2.2
Receiving frequency response
Y
※
※
※
※
※
※
※
※
5.2.3
Side-tone objective reference
Y
※
※
※
※
※
※
※
※
equivalent
5.2.4
Distortion
Y
※
※
※
※
※
※
※
※
5.2.4.1
Sending distortion
Y
※
※
※
※
※
※
※
※
5.2.4.2
Receiving distortion
Y
※
※
※
※
※
※
※
※
5.2.5
Receiver volume control
Y
※
※
※
※
※
※
※
※
5.2.6
Continuous sound pressure level of
Y
※
※
※
※
※
※
※
※
※
※
Y
※
※
※
※
※
※
receiver
5.3
Cordless phone function in connecting
to PSTN
5.3.1
Radio frequency requirement
※
※
Y
※
※
※
※
※
※
5.3.2
Security code requirement
※
※
Y
※
※
※
※
※
※
5.3.3
Transmitter requirement
※
※
Y
※
※
※
※
※
※
5.3.3.1
Carrier frequency
※
※
Y
※
※
※
※
※
※
5.3.3.2
Modulation sensitivity
※
※
Y
※
※
※
※
※
※
5.3.3.3
Audio distortion
※
※
Y
※
※
※
※
※
※
5.3.4
Receiver requirement
※
※
Y
※
※
※
※
※
※
5.3.4.1
Useable sensitivity
※
※
Y
※
※
※
※
※
※
5.3.4.2
Useable bandwidth
※
※
Y
※
※
※
※
※
※
5.3.4.3
Audio distortion
※
※
Y
※
※
※
※
※
※
5.3.4.4
Signal and noise ratio
※
※
Y
※
※
※
※
※
※
5.3.4.5
Adjacent channel rejection
※
※
Y
※
※
※
※
※
※
5.3.4.6
Spurious response rejection
※
※
Y
※
※
※
※
※
※
5.3.5
Radiated Field Intensity and
※
※
Y
※
※
※
※
※
※
Interference Test
7
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
Test requirement product types list
Sec.
5.4
Titles
A
B
C
D
E
F
G
H
I
Transmission characteristics of public
※
※
※
※
※
※
Y
Y
※
automatic switching exchange
5.4.1
General function
※
※
※
※
※
※
Y
Y
※
5.4.2
Quiescent state noise
※
※
※
※
※
※
Y
Y
※
5.4.3
Transmission loss
※
※
※
※
※
※
Y
Y
※
5.4.4
Cross talk
※
※
※
※
※
※
Y
Y
※
5.5
Protocol requirement
※
※
※
Y
Y
※
※
※
※
5.6
Caller ID requirement
※
※
※
※
※
Y
※
※
※
5.6.1
FSK signals inspection standard
※
※
※
※
※
Y
※
※
※
5.6.1.1
DC / AC Termination
※
※
※
※
※
Y
※
※
※
5.6.1.2
Timing
※
※
※
※
※
Y
※
※
※
5.6.1.3
Signaling case
※
※
※
※
※
Y
※
※
※
5.6.1.4
Packet case
※
※
※
※
※
Y
※
※
※
5.6.1.5
Presentation layer messages case
※
※
※
※
※
Y
※
※
※
5.6.2
DTMF signaling Test criteria
※
※
※
※
※
Y
※
※
※
5.6.2.1
DC resistance in the NIT state
※
※
※
※
※
Y
※
※
※
5.6.2.2
Leaving the NIT state
※
※
※
※
※
Y
※
※
※
5.6.2.3
DTMF signaling
※
※
※
※
※
Y
※
※
※
5.6.2.4
DTMF Code/Number
※
※
※
※
※
Y
※
※
※
5.6.2.5
Guarding against interference from
※
※
※
※
※
Y
※
※
※
※
※
※
※
※
※
※
※
※
※
※
※
※
※
※
※
※
※
the parallel equipment
5.7
Automatic dialing function
requirement
5.7.1
Automatic dialing function
requirement
5.7.1.1
Automatic repeated call attempts
※
※
※
※
※
※
※
※
※
5.7.1.2
Disconnecting Time of automatic
※
※
※
※
※
※
※
※
※
※
※
※
※
※
※
※
※
※
dialing
5.7.2
Automatic answer function
requirement
Notes:
1).Y means the item of requirements which Terminal Equipment should comply with.
2).※means the item of requirements which Terminal Equipment should comply with if the function is provided.
3).Terminal Equipment should comply with item 5.4.4 Cross talk requirements.
8
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
2.Definition、Symbols and Abbreviations
2.1 Definition
Terminal Equipment: Equipment which is used in connecting to public switched telephone network for
getting telephone communication service.
Loop Simulator: Simulated Circuit used in supplying DC loop current for testing.
Reference Load Impedance: A reference load impedance used in general test case of this technical
requirement. 600Ω is used in general case, unless defined in special case of test. See
Appendix.
Artificial Transmission Line: A simulated circuit used in test case to simulate the impedance and loss of
telephone network.
Automatic dialing: Automatic dialing is defined as the process whereby the dialing information is
automatically transmitted after seizure of a line.
Automatic line seizure: Automatic line seizure refers to seizure of the line not immediately succeeding a
manual operating procedure:
Automatic repeat call attempts : An automatic repeated call, of the same number that is failure at last call.
Call attempt: A procedure of TE in sending the call address number.
Communication state: The communication state commences after dialing, in the case of an outgoing call, or
commences after answering of the call, in the case of an incoming call and ends with the
transition of the terminal equipment to the quiescent state.
Connection to earth: A terminal of equipment used in connecting with Ground wire of power outlet or a
connection point on the equipment used in connecting to Ground while been test.
Dialing: Dialing begins with the emission of the first digit and ends with the last digit necessary for
establishment of the call.
Dialing state: The dialing state is the operating state from the beginning to the end of the transmission of
dialing information.
Inter-digital state: The inter-digital state commences on conclusion of the emission of one digit and ends
when emission of the next digit commences or with the beginning of the communication states,
as appropriate.
Longitudinal Conversion Loss: The measure of impedance is balanced to earth.
Network Termination Point (NTP): The physical connecting points to the Network.
Off hook condition: The off-hook condition commences when the terminal equipment has reached the
stationary dc resistance level and ends with the transition to the dialing state or the quiescent
state.
Operating states: The following operating states exist: quiescent state, off-hook condition, dialing state,
inter-digital state, communication state, ringing state as well as the transitions to these states.
Quiescent state: The quiescent state is characterized by the fact that the terminal equipment is neither in a
transient state nor in the dialing, ringing, off-hook, inter-digital or communication states.
Return Loss: Of the TE, a description of impedance is matching to PSTN.
Ringing state: The ringing state commences with the reception of the first ringing signal and ends with the
answering of the call or when no further ringing signals are received.
Switching signals: Switching signals are electrical characters for signaling between terminal equipment and
equipment of the telephone network.
Telecommunication messages: Telecommunication messages are electrical signals generated by terminal
9
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
equipment and which are not required for communication with the telephone network.
Transient states: From the quiescent state to the off-hook condition of outgoing call, from the ringing state
to the communication state incoming call or from the communication state to the quiescent
state of call clearing.
Metallic voltage: The potential difference between the tip and ring connections.
Longitudinal voltage: One half of the vector sum of the potential difference between the tip connection and
earth ground, and the ring connection and earth ground.
2.2 Symbols
Ω
:
ohm
dB
:
decibell
dBspl.
:
dB sound pressure level
a.c.
:
alternating current
d.c.
:
direct current
dBm
:
dB miliwatt
dBV
:
dB Volt
DTMF
:
Dual Tone Multiple Frequency
V
:
Voltage
mA
:
miliampare
R
:
Resistance
ZR
:
Reference impedance
ERP
:
Ear Reference Point
MRP
:
Mouth Reference Point
r.m.s
:
root mean square
RL
:
Return Loss
2.3 Abbreviations
ACTE
: Automatic Call Transfer Equipment
DTMF
: Dual Tone Multi-Frequency
HGP
: DTMF High frequency Group Power
LGP
: DTMF Low frequency Group Power
PBX
: Private Branch Exchange system
PSTN
: Public Switched Telephone Network
RVA
: Recorded Voice Announcement
TE
: Terminal Equipment
10
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
3.EMC Requirement
TE should comply with requirements of CNS 13438 C 6357(Information technology equipment, Radio)
Disturbance characterstics-Limits and methods of measurement) as EMC’s technolody requirement and testing
standard.
4.Safety Requirement
TE should comply with requirements of CNS14336 C 5268(Safety of information technology equipment)
Including overvoltage and sound pressure testing items as electric safety technology requirement and testing
standard.
5.Telecommunication requirement
5.1 Public switch telephone network interface requirement
5.1.1 Basic requirements
1.
The TE shall be an independent entity not belongs to Type 1 telecommunications enterprises and
prohibited to modify Type 1 telecommunications enterprises equipment.
2.
Any additional functions shall not impact public telecom equipment switching, testing, transport
and billing functions when TE is connected to Network.
3.
While the TE is damaged or malfunctioning, other connected equipment should be influenced
continue to function properly.
5.1.2 Surge Protection
Voltage Wave-shape of Surge
Front Time ( Tf ) = 1.67 × T , where T is time from 30% to 90% of peak voltage.
Decay Time ( Td ): Time from virtual origin to 50% of peak voltage on trailing edge
The circuit diagram of Surge Generator:
S1
C1=20μF
*R3=25Ω
R2=15Ω
S2
C2=0.2μF
R1=50Ω
Open circuit voltage waveshape:
T：time from 30% to 90% of peak voltage
Tf = 1.67 × T
Td：Time from virtual origin to 50% of peak
voltage on trailing edge
11
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
12
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
5.1.2.1 Telephone Line Surge Test:
5.1.2.1.1 Metallic Surge Test:
Requirement: After applying the metallic surge test, all the operational functions must work well.
1. Metallic surge wave form:Front time〔Tf〕≦10μs、decay time 〔Td〕≧560μs and peak
voltage≧800V, the surge generator should support over 100A peak current.
2. Apply the above surge wave form on the tip and ring of telephone line, while EUT is at
on-hook and any operational mode, and then change the polarity to test it again.
Purpose: To simulate induced metallic surge voltage on a telephone line which could result from
lightning.
Test Method:
1. Figure 1 shows the metallic surge test configuration.
2. The method of metallic surge test
(1) Set the front time(Tf)、decay time(Td) and peak voltage of metallic surge wave form.
(2) Set EUT at on-hook mode.
(3) Apply one surge of each polarity between two leads.
(4) Record and check the functions of EUT.
(5) Set the EUT under each operational mode and repeat step (3) to (4).
Test equipment:
1. Surge Generator.
2. Loop Simulator.
EUT
Surge
Generator
Earth terminal
Loop Simulator
Figure 1
Surge test configuration
5.1.2.1. 2 Longitudinal Surge Test:
Requirement: After applying the metallic surge test, all the operational functions must work well.
1. Longitudinal surge wave form:Front time〔Tf〕≦10μs、decay time〔Td〕≧160μs and peak
voltage≧1500V, the surge generator should support over 200A peak current.
2. Apply the above surge wave form on the shorted tip and ring of telephone line about earth,
while EUT is at on-hook and any operational mode, and then change the polarity to test it
again.
Purpose: To simulate induced longitudinal surge voltage on a telephone line which could result from
13
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
lightning.
Test Method:
1. Figure 1 shows the longitudinal surge test configuration.
2. The method of metallic surge test
(1) Set the front time(Tf)、decay time(Td) and peak voltage of longitudinal surge wave
form.
(2) Set EUT at on-hook mode.
(3) With two leads connected together, apply one surge of each polarity between leads and
ground.
(4) Record and check the functions of EUT.
(5) Set the EUT under each operational mode and repeat step (3) to (4).
Test equipment:
1. Surge Generator.
2. Loop Simulator.
5.1.2.2 AC Power Line Surge Test:
Requirement: After applying the AC power surge test, all the operational functions must work well.
1. AC power surge wave form:Front time (Tf)≦2μs、decay time (Td)≧10μs and peak
voltage ≧2500V, the surge generator should support over 1000A peak current.
2. Apply the above surge wave form on the tip and ring of telephone line, while EUT is
powered on and off , and then change the polarity to test it three times.
Purpose: To simulate induced AC power surge voltage on a telephone line which could result from
lightning.
Test Method:
1. Figure 2 shows the AC power surge test configuration.
Surge
AC Power Line
Simulator
Figure.2
EUT
AC Power line surge test configuration
2. The method of AC power surge test
(1) Set the front time(Tf)、decay time(Td) and peak voltage of AC power surge wave form.
(2) Power on EUT.
(3) Apply three times surge of each polarity between two leads.
(4) Record and check the functions of EUT.
14
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
(5) Power off EUT and repeat step (3) to (4).
Test equipment:
1. Surge Generator.
2. AC Power Source.
5.1.3 Line Polarity:
Requirement: The two polarity connections of TE to PSTN shall comply with the requirements of
this technical standard.
Purpose: To make sure TE can work with the PSTN in two polarity connections.
Test method: Where tests with both polarity connections are needed for this regulation.
5.1.4 Leakage current limitations
Requirement: TE shall have a voltage applied to the combination of test points listed in the table 1.
(1) test point:All telephone connections.
(2) test point:All power connections.
(3) test point:All possible combinations of exposed conductive surfaces on the exterior of
such equipment.
Gradually increase the voltage from zero to the values listed in Table 1 over a 30 seconds
time period, then maintain the voltage for one minute. The current in the mesh formed by
the voltage source and these points shall not exceed 10mA peak at any time during this
90-second interval.
Table 1: Voltages applied for various combinations of connection points
Voltage source connected between:
AC voltage value
(1) and (3)
1000V/60Hz
(1) and (2)
1500V/60Hz
(2) and (3)
1500V/60Hz
Purpose: To verify the integrity of the dielectric barrier between the network and power line and the
equipment connections of the EUT.
Test method:
1. Leakage current limitations Test Configuration as Fig.3.
2. Leakage current limitations test method:
(1) Select the appropriate EUT test point, according to the table 1.
(2) Set EUT at on-hook.
(3) Gradually increase the test voltage from 0 to the level required for the connections
under test in reference to Table 1(i.e. V1), over a 30-second period. Maintain the
maximum voltage level during 60 seconds.
(4) Record the maximum current measured during this period.
(5) Calculate the the maximum leakage current = V2 ÷ 1000
(6) Repeat step (3) to (5) in each operational states.
(7) Change the different test point in table 1, repeat step (2) to (6).
Test equipment:
15
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
1. Isolated Adjustable High Voltage Source.
2. Voltmeters (V1 and V2).
V2
Isolated Adjustable
50 kΩ
1kΩ
EUT
High Voltage Source
Generator:
V1
0 to 1500 VAC/60 Hz
Figure 3
Leakage current limitation test configuration
5.1.5 Insulation resistance
Requirement: The insulation resistance between the following test points shall be greater than 5 MΩ
while apply 100 Vdc on th EUT.
1. TE with 2 wires:
(1) Telephone line, tip to ring.
(2) Telephone line, short tip with ring v.s. AC power.
(3) Telephone line, short tip with ring v.s. earth.
2. Leased line TE with 4 wires:
(1) Telephone line, short tip with ring v.s. shorting of T1 with R1.
(2) Telephone line, short T/ T1 with R/R1 v.s. earth ground.
(3) Telephone line, short T/ T1 with R/R1 v.s. AC power.
Purpose: To check whether the TE presents a higher resistance characters between ground and power
line and the equipment connections of the EUT.
Test method：
1.
Insulation resistance Test Configuration as Fig.4.
2.
Insulation resistance test method:
(1) Set EUT at on-hook state.
(2) Set the voltage to 100 Vdc.
(3) Connect output point to the tip an ring of telephone line.
(4) Measure and record the current. Calculate the insulation resistance = 100÷Idc.
(5) Connect output point to the test pints specified above one by one.
(6) Measure and record the current. Calculate the insulation resistance for each test
point.
Test equipment:
1.
100V DC Power Supply.
2.
Voltmenter. (V)
16
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
3.
Currentmeter (A)
T
1kΩ
A
EUT
T1
R
100V
DC Power
V
Supply
R1
AC power line
Figure 4
Insulation resistance test configuration
Earth Connecting
5.1.6 Characteristics of TE for ringing signals
5.1.6.1 Response to ringing signal
Requirement: If a ring detect function is provided and enabled, the TE shall be able to response to
ringing signals of 45 V rms at 20 Hz with a cadence of 1 sec. on and 2 sec. off
superimposed on a 48 VDC feeding voltage and series 5 kΩresistor.
Purpose: To verify the TE has to provide a minimum ringing response characters.
Test method：
1.
Response to ringing signal Test Configuration as Fig.5.
2.
Response to ringing signal test method:
(1)
The EUT should be at on-hook state.
(2)
Set AC signal generator to 20Hz and adjust the ring signal level to 45Vrms.
(3)
Check to see that the EUT provides an audible acoustic output or other response
states.
5 kΩ
48VDC
EUT
Ring signal
Generator
Figure 5
Response to ringing signal test configuration
Test equipment:
1.
DC power supply.
2.
Ring signal generator : Frequency generator + Ringing amplifier
17
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
5.1.6.2 Ringing Impedance
Requirement: Requirement: The ringing impedancce of the terminal equipment at ringing signal
20Hz, 75Vrms shall not be less than 5kΩ and capacitance shall be less than 3.0μF.
Purpose: It is assured by requiring the TE to present a impedance to ringing signals that is
sufficiently high.
Test method：
1.
Ringing Impedance Test Configuration as Fig.6.
2.
Ringing Impedance test method:
(1) The EUT should be at on-hook state.
(2) Set AC signal generator to 20Hz and adjust the signal level until the reading of V1
in EUT is 75Vrms.
(3) Measure the AC voltage, V2.
(4) Calculated the ringing impedance of the EUT. Z = V1  V2  1000.
(5) Digital storage oscilloscope monitor and record the waveform of V1 and V2.
(6) Calculate the phase angleθof impedance and the capacitance of EUT.
(a) θ= △t 50ms  360
(b) C = 1 /ω Z  sin
whereω= 2π f
θ : phase angle of impedance
△t : time different of V1 and V2
Digital Storage Oscilloscope
Ch1
GND
Ch2
1 kΩ
48VDC
V2
V1
Ring signal
Generator
Figure 6
Ringing Impedance Test Configuration
Test equipment:
1. Digital storage oscilloscoge.
2. Ring signal generator : Frequency generator + Ringing amplifier
3. DC power Supply.
4. AC Voltmeter(V1 and V2).
18
EUT
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
5.1.6.3 On-hook AC impedance
Requirement: While EUT is at on-hook state loaded with 3Vrms, 200Hz ~ 3200Hz AC signal on the
telephone line, the AC impedance shall be in the acceptable region of Figure 7.
Purpose: To prevent the interference to other TE connecting with in parallel.
Test method：
1.
On-hook AC impedance test configuration as Fig.8.
2. On-hook AC impedance test method:
(1)
EUT set on-hook state.
(2)
Set the AC signal generator to 200 Hz and adjust the output level to let V2 be 3
Vrms reading.
(3)
Measure and record the V1.
(4)
Calculate the AC impedance Z = V2  V1 x 10 kΩ.
(5)
Vary the AC signal generator slowly from 200 Hz to 3200 Hz, keeping V2 at 3
Vrms reading.
(6)
Repeat step (3) to (4) .
AC Impedance (kΩ)
Acceptable Area
(697, 100)
(1633, 100)
100
Unacceptable Area
50
(3200, 60)
(200, 30)
200
300
500
1000
2000
3200(Hz)
Fig.7 AC Impedance for On-hook Mode
10kΩ
V1
AC Signal
V2
Generator
Figure 8
On-hook AC impedance test configuration
19
EUT
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
Test equipment:
1.
AC Signal Generator.
2.
AC Voltmeter  2.
5.1.7 Off-hook DC resistance
Requirement: The DC voltage to loop current characteristics of the TE during the any operating
function of off-hook state shall appear on the acceptable region shown in Fig.9.
DC Voltage on T/R wires of TE
15
Unacceptable
10
(26, 10.6)
8
(20, 8)
6
(10, 6)
5
Acceptable
0
20
10
26 30
Loop Current (mA)
Figure 9: DC Voltage and Current limits
Purpose: To verify that the steady state DC loop characteristics. The test only applies to TE which
are capable of reaching the loop state.
Test method：
1.
Off-hook DC resistance Test Configuration as Fig.10.
2.
Off-hook DC resistance test method:
A
VR
48VDC
V
Figure 10
Off-hook DC resistance Test Configuration
(1) The EUT should be at off-hook state.
20
EUT
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
(2) Adjust the VR to let A be 10mA and 20mA readings separately, then record
the corresponding DC voltage and map the point into Fig.9. Each current
reading shall stay at least 5 seconds interval.
(3) Adjust the VR to let V be 10.6V reading, then record the DC current and map
the point into Fig.9.
(4) Repeat step (2) to (3) for each operating functions states of EUT.
Test equipment:
1. DC Power Supply.
2. DC Voltmeter.
3. DC Currentmeter.
4. Variable Resistor.
5.1.8 Sending level limitations of signals
Requirement: All the output level s of internal signals transmitted from TE except the DTMF, which
will be sent to the public switched telephone network, should follow:
(1) The mean sending level in the frequency range 200 Hz to 4000 Hz over a one-minute
period shall not be greater than –10dBm when the TE interface is terminated with the
reference impedance 600 ohms. Output level shall be not adjustable to over this limit
range by the user. This requirement does not apply to DTMF signals.
(2) The mean sending level in the frequency range 4kHz to 8kHz over a one-minute period
shall not be greater than –20dBm when the TE interface is terminated with the
reference impedance 600 ohms.
(3) The mean sending level in the frequency range 8kHz to 12kHz over a one-minute
period shall not be greater than –40dBm when the TE interface is terminated with the
reference impedance 600 ohms.
(4) The mean sending level on the 4kHz bandwidth over the frequency range 12kHz to
40kHz over a one-minute period shall not be greater than –60dBm when the TE
interface is terminated with the reference impedance 600 ohms.
The leased line equipment have to meet this requirement.
Purpose: To verify that the voice band signal power and out-band noise from internal sources, other
than DTMF, which will be sent to public switched telephone network are properly limited.
Test method：
1.
EUT
Sending level limitations of signals Test Configuration as Fig.11.
Loop
R
Simulator
Bandpass
AC RMS
Fielter
Voltmeter
Figure 11 Sending level limitations of signals Test Configuration
21
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
2.
Sending level limitations of signals test method:
(1) Place the EUT in the desired state and transmit a signal at maximum power.
(2) Set band-pass filter in 200Hz to 4000Hz,
(3) Measure and record the maximum averaged output signal power level in dBm.
(4)
Band-pass filter to bandwidth 4kHz~8kHz/ 8kHz~12kHz…… /36kHz~40kHz.
(5) Measure and record the maximum averaged output signal power level in dBm for
each bandwidth.
(6) Repeat step (2) to step (5) for other internal output signals.
Test equipment:
1.
Loop Simulator.
2.
Bandpass Fielter.
3.
AC RMS Voltmeter.
4.
R : Reference Load of 600Ω
5.1.9 Transverse balance limitations
Requirement: TE are at on-hook, off-hook and tip-ring reverse states test, the minimum transverse
balance requirements as TABLE 2.
State
Frequency
Balance
Off-hook
200Hz≦f≦4000Hz
40dB
On-hook
200Hz≦f＜1000Hz
60dB
On-hook
1000Hz≦f≦4000Hz
40dB
Technical description: The transverse balance coefficient is expressed as:
Transverse Balance m-1 = 20 log10 Vm / V1
V1: is the longitudinal voltage produced across a longitudinal termination R2(500Ω) Vm
(0.775V): is the metallic voltage across the tip and ring interface of the input port when a
voltage at frequency band 200Hz to 4000 Hz is applied from a balance source with a
metallic impedance R0 (a corrective circuit) . The source voltage should be set such that
Vm = 0.775 Volts when a termination of R0 is substituted for TE.
Purpose: To ensure that the impedance unbalance about earth, expressed as output signal balance.
Test method：
1. Test Configuration of Transverse balance limitations is as Fig.12.
2. Transverse balance limitation test method:
(1) Set the AC signal generator to 200 Hz.
(2) Connect R0 ( corrective circuit) to the test circuit Fig.12.
(3) Adjust the output voltage (Vm) of AC signal generator to the frequency selective
voltmeter, which acrosses R0 , to be setted at 10Hz bandwidth and 0.775V.
(4) Connect the frequency selective voltmeter to across the R2 and test Vl.
(5) Adjust variable capacitors C3 and C4 until the minimum signal level of V l is
obtained. (The result of this balance calibration must be at least 20dB greater than
the balance requirement for the EUT at the frequency.)
(6) Replace R0 with EUT and set EUT at on-hook.
22
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
(7) Measure the metallic reference voltage (Vm) and the transverse voltage (V1).
(8) Calculate the balance using the following formula :
Transverse Balance = 20 log Vm / V1
(9) Reverse the tip and ring connections of the EUT and repeat step (7) to (9). The
lesser of the two results is the transverse balance of the EUT at 200 Hz.
(10) Repeat step (2) to (10) for at least each of the following frequencies : 500, 1000,
2000, 3000 and 4000 Hz.
(11) Repeat step (1) to (10) for each operational states.
T1
Tip
C1
C3
R1
Loop
R2
Simulator
R0
Vm
EUT
AC Signal
Earth
Generator
Vl
C2
C4
Ring
200 ~4000Hz
Earth metal
Figure 12 Test Configuration of Transverse balance limitations
Tip
300Ω
300 kΩ
350Ω
300Ω
Ring
Figure 13 Ro Corrective circuit
Test equipment:
1. AC Signal Generator.(ZOSC must be less or equal to 600Ω)
2. Loop Simulator.
3. R0：Corrective circuit as Figure 13.
23
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
4. R2：500Ωfor longitudinal resistor
5. T1：600Ω：600Ωsplit audio transformer
6. C1/C2：8mF±0.1%, 400V
7. C3/C4：100 ~ 500pF adjustable trimmer capacitors
8. R1：ZOSC+R1=600Ω
5.1.10 Return loss
Requirement: For all operational states of TE at 0 KM simulative loop, the return loss of TE shall
meet the following requirement:
(1) The return loss shall be greater than an echo return loss (ERL) of 8dB over a frequency
band of 500 Hz to 2500 Hz when measured against to 600Ω.
(2) The return loss in the frequency band 200 Hz to 3200 Hz shall be greater than 6dB
when measured against to 600Ω.
Purpose: To assured by requiring the TE to present a impedance which allows proper functioning of
call control and to maintain stability in the PSTN.
Test method：
1.
Return loss Test Configuration as Fig.14.
2.
Return loss test method:
(1) Set the EUT not to transmit any signals in the off-hook state.
(2) Put EUT in the off-hook state with the simulative loop be set at 0 KM.
(3) Vary the oscillator frequency from 200 Hz to 3200 Hz and record the minimum
value of return loss and frequency at which it occurs.
(4 )Set EUT to be at each off-hook operational states, then repeat step (3).
Oscillator
600Ω
C
EUT
Loop
Simulator
Return Loss Tester
Figure 14
Return loss Test Configuration
Test equipment:
1. Loop Simulator.
2. Return Loss Tester.
3. Oscillator.
4. C: 125μF±10%
24
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
5.1.11 Pulse dialing
Requirement: TE shall send normal pulse when TE be dialed the specifications are as follows.
(1) Pulse speed：10±1 P.P.S.
(2) Make / Brake ratio：33±3%.
(3) Minimum Inter-digit time：600msec.
Pulse dialing trigger current: High = 18 mA, Low = 6mA.
Purpose: To assure effective pulse dialing of TE to PSTN.
Test method：
1.Pulse dialing test configuration as Fig.15.
Adjustable artificial line
EUT
Loop
Storage
Simulator
Type
Oscilloscope
Figure 15 Pulse dialing test configuration
2. Pulse dialing test method:
(1) Set artificial line at 0 kM.
(2) Let TE send out Pulse Dial signals.
(3) Measure and record the DC Voltage of Pulse Dial signals.
(4) Set artificial line at 5 kM, repeat steps (2) to (3).
(5) Use the below fomula to calculate the average pulse speed, M/B ratio and minimum
interdigital time.
Idc
T3
(mA)
T4
T2
T1
t (μs)
T1 & T2 : Time at low trigger current
T3 & T4 : Time at high trigger current
Make interval
: begins≧T3
ends≦T4
Brake interval
: begins≦T1
ends≧T2
Rise time
: begins≧T2
ends≧T3
Fall time
: begins≦T3
ends≦T1
Period
: begins≧T4
ends≧T3
25
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications

P.P.S. = 1 ÷Period.

Make / Brake ratio = Make interval ÷Period x 100%.

Minimum Interdigital Interval Pause:
The minimum pause time between any two pulse dial digits.
Test equipment:
1.Adjustable artificial line.
2.Loop Simulator.
3.Storage Type Oscilloscope.
5.1.12 Dual tone multiple frequency (DTMF) dialing
5.1.12.1 Frequency combination
Requirement: The TE shall use DTMF signaling characters according to table 3. The tolerances on
the frequencies for the characters supported shall be ±1.5 % when artificial line at 0 kM
and 5 kM.
Purpose: To verify whether the TE sends appropriate DTMF signal frequency combination to PSTN.
The allowed combinations are listed in the table3.
Table 3 : Frequency of DTMF signals
LGP(Hz)
HGP (Hz)
1209
1336
1477
1633
697
1
2
3
A
770
4
5
6
B
852
7
8
9
C
941
*
0
#
D
Test method：
1. Frequency combination test configuration as Fig.16.
2. Frequency combination test method:
(1) The artificial line set to 0 KM.
(2) Let the EUT transmit DTMF signal "1"to line.
(3) Measure and record the frequency of DTMF signals.
(4) Calculate the frequency deviation.
(5) Repeat for each of the other dialer number that the EUT is equipped to generate.
Repeat step (3) to (4).
(6) Set artificial line to 5 KM, Repeat step (2) to (5).
Adjustable artificial line
EUT
26
Loop
Spectrum
Simulator
Analyzer
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
Figure 16 Frequency combination test configuration
Test equipment:
1. Adjustable Artificial line.
2. Loop Simulator.
3. Spectrum Analyzer.
5.1.12.2 Signaling level
Requirement:
(1) The level of any tone in the DTMF high frequency group shall be –6 ±2dBm and the
level of any tone in the low frequency group shall be –8 ±2dBm when the TE interface
is terminated with the reference impedance 600 ohms and artificial line at 0 KM.
(2) The level of any tone in the DTMF high or low frequency group shall be ≧-21dBm
when the TE interface is terminated with the reference impedance 600 ohms and
artificial line at 5 KM.
Purpose: To check whether the TE sends appropriate DTMF signals.
Test method：
1.
Signaling level test configuration as Fig.17.
2.
Signaling level test method:
(1) The artificial line set to 0 KM.
(2) Let the EUT transmit DTMF signal "1"to line.
(3) Measure and record the frequency of DTMF signals power level.
(4) Repeat for each of the other dialer number that the EUT is equipped to generate.
Repeat step (3).
(5) Set artificial line to 5 KM, Repeat step (2) to (4).
Adjustable artificial line
EUT
Spectrum
Loop
Simulator
R
Figure 17 Signaling level test configuration
Test equipment:
1. Adjustable Artificial line.
2. Loop Simulator.
3. Spectrum Analyzer.
4. R: 600Ω Reference Load.
27
Analyzer
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
5.1.12.3 Signaling level difference
Requirement: During sending of any DTMF frequency combination, the level of the tone in the high
frequency group shall be 0 to 3 dB high than the level of the tone in the low frequency
group when artificial line at 0KM.
Purpose: To check whether the TE sends appropriate DTMF signals.
Test method：
1. Signaling level difference test configuration as Fig.17.
2. Signaling level test method:
(1) The artificial line set to 0 KM.
(2) The EUT set in the off-hook stated, transmitting DTMF signal to line.
(3) Send dialer no. 1 signal, measure and record the frequency of DTMF signals power
level.
(4) Calculate the signal level difference.
(5) Repeat for each of the other dialer number that the EUT is equipped to generate.
Repeat step (2) to (4).
Test equipment:
1. Adjustable Artificial line.
2. Loop Simulator.
3. Spectrum Analyzer.
5.1.12.4 Tone duration
Requirement: The TE shall provide a setting whereby the duration for which any individual DTMF
tone combination sent is not less than 40 ms. This requirement applies only to a TE with an
automatic dialing function. It applies when the TE is in automatic dialing mode.
Purpose: To check whether the TE sends DTMF signals of the appropriate duration.
Test method：
1. Tone duration test configuration as Fig.18.
2. Tone duration test method:
(1) The artificial line set to 0 KM.
(2) The EUT set in the off-hook stated and automatic dialing mode.
(3) Transmitting DTMF signal to line.
(4) Measure and record the all DTMF signal.
(5) Calculate and record the minimum tone duration.
(6) Adjust the artificial line to 5KM, Repeat step(2) to (5).
Adjustable artificial line
EUT
Loop
Storage
Simulator
Type
Oscilloscope
28
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
Figure 18
Tone duration test configuration
Test equipment:
1. Adjustable Artificial line.
2. Loop Simulator.
3. Storage Type Oscilloscope.
5.1.12.5 Pause duration
Requirement: The TE shall provide a setting whereby the duration of the pause between any
individual DTMF tone combination is not less than 50 ms. This
requirement applies only to a TE with an automatic dialing function.Purpose: To check
whether the TE sends DTMF signals of the appropriate duration. This requirement applies
only to a TE with an automatic dialing function. It applies when the TE is in automatic
dialing mode.
Purpose: To check whether the TE sends DTMF signals of the appropriate duration.
Test method：
1. Pause duration test configuration as Fig.18.
2. Pause duration test method:
(1) The artificial line set to 0 KM.
(2) The EUT set in the off-hook stated and automatic dialing mode.
(3) Transmitting DTMF signal to line.
(4) Measure and record the all DTMF signal.
(5) Calculate and record the minimum pause duration between any individual DTMF
signal.
(6) Adjust the artificial line to 0 KM and repeat step (2) to (5).
Test equipment:
1. Adjustable Artificial line.
2. Loop Simulator.
3. Storage Type Digital Oscilloscope.
5.1.13 Series equipment
5.1.13.1 DC voltage drop of series equipment
Requirement: The DC voltage drop across the line connections shall be less than 3V with loop
current at 30mA and shall be less than 6V with loop current at 60mA.
Purpose: Series equipment which is connected and operates with another TE which is in the
off-hook condition, or which remain in the circuit at all times.
Test method：
1. DC voltages drop of series equipment test configuration as Fig.19.
2. DC voltage drop of series equipment test method:
(1) Adjust variable resistor to give a loop current 30mA.
(2) Measure and record DC voltmeter V1.
(3) EUT set to be at on-hook state and connect to the configuration as fig.19.
29
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
(4) Measure and record DC voltmeter V2.
(5) Calculate DC voltage drop = V2 – V1.
(6) Adjust variable resistor to give a loop current 60mA and repeat step (2) to (5).
Test equipment:
1. Loop Simulator.
2. Currentmeter A.
3. DC Voltmeter V1 and V2.
4. VR：variable resistor
A
VR
Loop
V
Simulator
Figure 19
EUT
600Ω
DC voltages drop of series equipment test configuration
5.1.13.2 Insertion loss of series equipment
Requirement: The Insertion Loss of Series Equipment shall be less than 1.5 dB at frequency 1500
Hz when test with signal level of – 10dBV and reference load 600Ω.
Purpose: Series equipment which is connected and operates with another TE which is in the
off-hook condition, or which remain in the circuit at all times.
Test method：
1. Insertion loss of series equipment test configuration as Fig.20.
2. Insertion loss of series equipment test method
(1) Set the frequency generator to 1500 Hz and adjust to an output level of –10dBV as
measured by the AC voltmeter across 600 ohms resistor.
(2) EUT set to on-hook state and connect EUT to the test circuit Fig.20.
(3) Measure and record the AC voltmeter V (dBV).
(4) Calculate insertion loss = –10dBV – V.
C: 2μF±10%
Signal
Loop
Generator
Simulator
AC
Zs = 600
30
Voltmeter
EUT
600
Ω
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
Figure 20
Insertion loss of series equipment test configuration
Test equipment:
1. Signal Genterator.
2. Loop Simulator.
3. AC Voltmeter.
5.2 Handset function
5.2.1 Transmission objective reference equivalent
5.2.1.1 Sending objective reference equivalent (According to OREM-A specification)
Requirement: According to OREM-A specification, the sending objective reference equivalent shall
be +11~ -2 dB when measured with the artificial line set to 0KM and +11 ~ 0 dB when
measured with the artificial line set to 5KM.
Purpose: The TE have a objective reference equivalent compatible with other telephones connected
to the network so as to be capable of providing adequate speech performance.
Test method：
1. Sending objective reference equivalent test configuration as Fig.21.
2. Sending objective reference equivalent test method:
(1) The Sending objective reference equivalent value shall be determined from
measured frequency response curve using the calculation method described in
OREM-A.
(2) The frequency response curve shall be measured over a range from at least 200Hz to
5000Hz in accordance with OREM-A method.
(3) The handset setup on artificial ear and mouth accordance with OREM-A method.
(4) Artificial line set to 0KM.
(5) The nominal sound pressure level produced by the artificial mouth shall be
0.6dBPa.
(6) Measure and record the Sending objective reference equivalent value from objective
equivalent tester.
(7) Artificial line set to 5KM and Repeat step (5) to (6).
C=2μF±10%
T
dB meter
600 Ω
R
Tx
31
Loop simulator
Artificial line
Artificial
mouth
Telephone handset
Speech network
Signal
Generator
Rx
Sound
attenuation
cover
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
C=2μF±10%
Amplifier
Figure 21 Sending objective reference equivalent test configuration
Test equipment:
1. Signal Generator.
2. Amplifier.
3. Artificial mouth.
4. Sound attenuation cover.
5. Telephone handset Speech network.
6. Artificial line.
7. Loop simulator.
8. dB meter : Objective reference equivalent meter or level recorder
5.2.1.2 Receiving objective reference equivalent (According to OREM-A specification)
Requirement: According to OREM-A specification, the receiving objective reference equivalent
shall be 5 ~ -6 dB when measured with the artificial line set to 0KM and 5 ~ -4 dB when
measured with the artificial line set to 5Km.
If the telephone handset has adjustable receive gain, it shall be set to provide the nominal
output level.
Purpose: The TE have a objective reference equivalent compatible with other telephones connected
to the network so as to be capable of providing adequate speech performance.
Test method：
1. Receiving objective reference equivalent test configuration as Fig.22.
2. Receiving objective reference equivalent test method:
(1) The receiving objective reference equivalent value shall be determined from
measured frequency response curve using the calculation method described in
OREM-A.
(2) The frequency response curve shall be measured over a range from at least 200Hz to
5000Hz in accordance with OREM-A method.
(3) The handset setup on artificial ear and mouth accordance with OREM-A method.
(4) Artificial line set to 0 KM.
(5) AC Signal generator be sent 285mv to artificial ear.
(6) Measure and record the receiving objective reference equivalent value from
objective equivalent meter.
(7) Artificial line set to 5KM and Repeat step (5).
C=2μF±10%
Amplifier
AC signal
generator
Loop simulator
R
Tx
32
Artificial line
Artificial
ear
T
Telephone handset
Speech network
Rx
dB
Meter
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
Sound
attenuation
cover
Figure 22
C=2μF±10%
Receiving objective reference equivalent test configuration
Test equipment:
1. dB meter : Objective reference equivalent meter or level recorder
2. Amplifier.
3. Sound attenuation cover.
4. Artificial ear.
5. Telephone handset Speech network.
6. Artificial line.
7. Loop simulator.
8. AC signal generator.
5.2.2 Transmission characteristics frequency response
5.2.2.1 Sending frequency response (According to OREM-A specification)
Requirement: According to OREM-A specification, the sending frequency response, as a function of
frequency, shall be not greater than the upper limit and not less than the lower limit shown
in figure 23 between 180 Hz to 5000 Hz. The 1000 Hz point on the frequency response
graph is to be placed at the 0dB level on Fig.23 when measured with the artificial line set to
0KM.
Purpose: The TE have a frequency response compatible with the network and with other telephones
connected to the network so as to be capable of providing adequate speech performance.
Test method：
1. Sending frequency response test configuration as Fig.21.
2. Sending frequency response test method:
(1) The handset setup on artificial ear and mouth accordance with OREM-A method.
(2) Artificial line set to 0KM.
(3) The nominal sound pressure level produced by the artificial mouth shall be
0.6dBPa.
(4) The frequency response curve shall be measured in a range of 200 Hz to 5kHz in
according to OREM-A method.
(5) Measure and record the sending frequency response.
Test equipment:
1. Signal Generator.
2. Amplifier.
3. Artificial mouth
4. Sound attenuation cover
5. Telephone handset Speech network.
6. Artificial line.
7. Loop simulator.
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PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
8. dB meter: Objective reference equivalent metor (OREM) or level recorder.
5.2.2.2 Receiving frequency response (According to OREM-A specification)
Requirement: According to OREM-A specification, the receiving frequency response, as a function
of frequency, shall be not greater than the upper limit and not less than the lower limit
shown in figure 24 between 240 Hz to 5000 Hz. The 1000 Hz point on the frequency
response graph is to be placed at the 0dB level on Fig.24 when measured with the artificial
line set to 0KM.
If the telephone handset has adjustable receive gain, and when the volume control is set to
nominal output level and maximum output level shall be meet this requirement.
Purpose: The TE have a frequency response compatible with the network and with other telephones
connected to the network so as to be capable of providing adequate speech performance.
Test method：
1. Receiving frequency response test configuration as Fig.22.
2. Receiving frequency response test method:
(1) The handset setup on artificial ear and mouth accordance with OREM-A method.
(2) Artificial line set to 0KM.
dB
+20
14dB
+10
18dB/Oct.
12dB/Oct.
2dB
0
-4dB
12dB/Oct.
6dB/Oct.
12dB/Oct.
-10
-11dB
-14.5dB
-20
Frequency (Hz)
180
200
300
1000
2000 3000
Figure 23: Frequency Response of Sending
34
4500 5000
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
dB
+20
8.5dB
+10
5.5dB
2dB/Oct.
0
3dB/Oct.
3dB/Oct.
18dB/Oct.
-2dB
5dB/Oct.
-10dB
18dB/Oct.
-10
24dB/Oct.
2dB
-20
Frequency (Hz)
240
500
1000
3000
4500 5000
Figure 24: Frequency Response of Receiving
(3) AC Signal generator be sent 285mv to artificial ear.
(4) The frequency response curve shall be measured in a range of 200 Hz to 5kHz in
accordance with OREM-A method.
(5) Measure and record the receiving frequency response.
Test equipment:
1. dB meter : Objective reference equivalent meter or level recorder
2. Amplifier.
3. Sound attenuation cover.
4. Artificial ear.
5. Telephone handset Speech network.
6. Artificial line.
7. Loop simulator.
8. dB meter: Objective reference equivalent meter (OREM) or level recorder.
5.2.3 Side-tone objective reference equivalent (According to OREM-A specification)
Requirement: According to OREM-A specification, the side-tone objective reference equivalent
shall be ≧ 4 dB when measured with the artificial line set to 0KM and 5KM.
If the telephone handset has adjustable receive gain, it shall be set to provide the nominal
output level.
Purpose: The TE have a side-tone performance which neither disturbs the user nor interferes with
the speech levels to such an extent as to render the telephone incompatible with adequate
speech performance.
Test method：
1. Side-tone objective reference equivalent test configuration as Fig.25.
C= 2μF±10%
35
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
Amplifier
600 ohms
R
Tx
Signal
Generator
Loop simulator
Amplifier
Artificial line
Artificial
ear
T
Telephone handset
Speech network
Rx
dB Meter
C =2μF±10%
Artificial
mouth
Figure 25 Side-tone objective reference equivalent test configuration
2. Side-tone objective reference equivalent test method:
(1) The side-tone objective reference equivalent shall be measured according to
OREM-A method.
(2) The handset setup on artificial ear and mouth accordance with OREM-A method.
(3) The sound presure level of artificial mouth be produced 0.6dBa, frquency is from
200Hz to 5kHz
(4) Artificial line set to 0KM.
(5) Measure and record the side-tone objective reference equivalent value from
objective equivalent tester.
(6) Artificial line set to 5KM and Repeat step (4).
Test equipment:
1. Sinal generator.
2. Amplifier  2.
3. Artificial ear.
4. Artificial mouth.
5. Telephone handset Speech network.
6. Artificial line.
7. Loop simulator.
8. dB meter: Objective reference equivalent meter (OREM) or level recorder.
5.2.4 Distortion
5.2.4.1 Sending distortion (According to OREM-A specification)
Requirement: The total distortion in the electric output signal of transmitter to telephone line shall
not exceed 5% when measured with the artificial line set to 0KM.
Purpose: The TE not to produce distortion of the transmitted speech signals sufficient to interfere
with adequate speech performance.
Test method：
1. Sending distortion test configuration as Fig.26.
2. Sending distortion test method:
(1) The handset setup on artificial ear and mouth accordance with OREM-A method.
36
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
(2) Artificial line set to 0KM.
(3) The artificial mouth sound pressure level shall be set to 0dBPa at 1000 Hz.
(4) Measure and record the sending distortion from distortion meter.
C = 2μF±10%
Distortion
analyzer
600 ohms
Loop simulator
Artificial line
R
Tx
Signal
Generator
T
Amplifier
Telephone handset
Speech network
Rx
Sound
attenuation
cover
C = 2μF±10%
Artificial
mouth
Figure 26 Sending distortion test configuration
Test equipment:
1. Signal Generator.
2. Amplifier.
3. Artificial Ear.
4. Artificial mouth.
5. Telephone handset Speech network.
6. Loop simulator
7. Distortion analyzer.
8. Artificial line
5.2.4.2 Receiving distortion (According to OREM-A specification)
Requirement: The total distortion of receiver shall not exceed 7% when measured with the artificial
line set to 0KM.
If the telephone handset has adjustable receive gain, the total distortion of receiver shall not
exceed 10% when the volume control set to maximum output level.
Purpose: The TE not to produce distortion of the received speech signals sufficient to interfere with
adequate speech performance.
Test method：
1. Receiving distortion test configuration as Fig.27.
2. Receiving distortion test method:
(1) The handset setup on artificial ear and mouth accordance with OREM-A method.
(2) Artificial line set to 0KM.
(3) The signal generator shall be set to –12dBv / 1000 Hz. Sine wave to EUT.
(4) Measure and record the receiving distortion from distortion meter.
(5) If the EUT has the function of increasing receiver gain, set the voice level in the
37
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
maximum and repeat step(4).
C =2μF±10%
Artificial Ear
T
AC signal
generator
Loop simulator
Artificial line
R
Tx
Sound
attenuation
cover
Telephone handset
Speech network
Rx
Amplifier
Distortion
meter
C =2μF±10%
Figure 27 Receiving distortion test configuration
Test equipment:
1. Signal Generator.
2. Distortion meter
3. Amplifier
4. Artificial era
5. Sound attenuation cover
6. Telephone handset speech network
7. Loop simulator
8. Artificial line
5.2.5 Receiver volume control
Requirement: If the telephone handset has adjustable receive gain, it shall be provide 3dB of gain
minimum and up to 6dB of gain maximum when measured in term of receiving objective
reference equivalent.
The 6dB of gain maximum may be exceed if the receiver volume is automatically restored
to its nominal value when the TE is returned to the on-hook state.
Purpose: To provide adequate speech receiving performance with other TE in connected through the
network.
Test method：
1. Receiver volume control test configuration as Fig.22.
2. Receiver volume control test method:
(1) Artificial line set to 0KM.
(2) Receiver volume control set to minimum condition.
(3) Measure and record receiving objective reference equivalent. SORE1 according to
section 5.2.1.2.
(4) Receiver volume control adjusted to maximum condition and repeated step (3) then
get the SORE2.
(5) Calculate the receive gain = SORE2 – SORE1.
38
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
(6) Artificial line adjusted to 5KM and repeated step (2) to (5).
Test equipment:
1. Signal generator.
2. Amplifier.
3. Artificial ear.
4. Sound attenuation cover.
5. Telephone handset Speech network.
6. Artificial line.
7. Loop simulator.
8. dB meter: Objective reference equivalent meter (OREM) or level recorder.
5.2.6 Continuous sound pressure level of receiver
Requirement: In the off-hook mode, rms acoustic pressure of receiver shall be less than 125 dB(A).
If the telephone handset has adjustable receive gain, it shall be meet this requirement when
volume control set to maximum output level.
Purpose: To protect the user not hurt in hearing function.
Test method：
1. Continuous sound pressure level of receiver test configuration as Fig.28.
2. Continuous sound pressure level of receiver test method:
(1) Set the sound level amplifier to provide “A” weighting and “slow” response.
(2) EUT set off-hook state and adjust variable resistor to give a loop current 30mA.
(3) Set the signal generator to give an output 4.0Vrms into an open circuit at a
frequency of 1000 Hz.
(4) Sweep the signal generator frequency from 180 Hz to 10 kHz.
(5) Measure and record the maximum acoustic output reading of receiver during the
frequency sweep.
C = 2μF±10%
Sound level meter
A
Signal
generator
R
Tx
Sound
attenuation
cover
Loop simulator
Artificial
ear
T
Telephone handset
Speech network
Rx
Amplifier
C = 2μF±10%
Figure 28 Continuous sound pressure level of receiver test configuration
Test equipment:
1. Sound level meter.
2. Artificaial ear.
3. Sound attenuation cover.
4. Telephone handset Speech network.
39
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
5. DC current meter.
6. Loop simulator
7. Signal generator.
5.3 Cordless Phone function in connecting to PSTN
5.3.1 Radio frequency requirement
The frequency below 80 MHz of the low power duplex cordless telephone shall be adapted by DGT
(as table 4 and table 5).
Table 4 The operation frequency for 1.6 / 49MHz cordless phone
Channel
Base station frequency(MHz)
Portable frequency(MHz)
Receive
Transmission
Transmission
Receive
1
49.830
1.665
49.830
1.665
2
49.830
1.695
49.830
1.695
3
49.830
1.725
49.830
1.725
4
49.830
1.755
49.830
1.755
5
49.830
1.785
49.830
1.785
6
49.845
1.665
49.845
1.665
7
49.845
1.695
49.845
1.695
8
49.845
1.725
49.845
1.725
9
49.845
1.755
49.845
1.755
10
49.845
1.785
49.845
1.785
Table 5 The operation frequency for 46 / 49MHz cordless phone
Channel
Portable(Transmission frequency)
Base station(Transmission frequency)
1
49.670 MHz
46.610 MHz
2
49.845 MHz
46.630 MHz
3
49.860 MHz
46.670 MHz
4
49.770 MHz
46.710 MHz
5
49.875 MHz
46.730 MHz
6
49.830 MHz
46.770 MHz
7
49.890 MHz
46.830 MHz
8
49.930 MHz
46.870 MHz
9
49.990 MHz
46.930 MHz
10
49.970 MHz
46.970 MHz
5.3.2 Security code requirement
The security measures of probability unauthorised use should be less than 1 in 1000 for both base
and handset unit.
A declaration of conformance to this requirement should be provided by the supplier.
40
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
5.3.3 Transmitter requirement
5.3.3.1 Carrier frequency
Requirement: The carrier frequency is the ability of the transmitter to maintain an assigned carrier
frequency ( The shift should be less than ±500Hz ).
Purpose: Test carrier frequency of transmitter to avoid interfering to other electrical equipments.
Test Method:
1. Carrier frequency test configuration as Fig.29.
2. Test method of measuring carrier frequency
(1) Operate the equipment in standby transmitter conditions.
(2) Record the carrier frequency of the transmitter as MCF.
(3) Calculate the frequency error by the following:
Frequency error = ACG – MCF.
MCF is the Measured Carrier Frequency in Hz.
ACF is the Assigned Carrier Frequency in Hz.
Loop Simulator
RF Stanrdard Load
EUT
RF Counter
for TE
Figure 29 Carrier frequency test configuration
Test equipment:
1. Loop Simulator.
2. RF. Stanrdard Load for TE.
3. RF Counter.
5.3.3.2 Modulation sensitivity (Use for Base station only)
Requirement: While input voice-band signal via loop simulator to TE, the signal level of standard
test modulation produced should be -12 ±3dB.(During testing, any microphone
auto-functions should be disable)
Purpose：The Modulation sensitivity is testing the Audio Input signal produce ±3KHz Deviation is to
modulate its sensitivity.
Test method:
1. Modulation sensitivity test configuration as Fig.30.
2. Test method of measuring Modulation sensitivity
(1) Apply a 1000Hz tone from the audio generator and adjust is output level until 60%
of rated system deviation is reached.
41
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
(2) Record the audio generator output level as the Modulation sensitivity.
Test equipment:
1. Loop Simulator.
2. Audio Frequency Signal Generator.
3. Standard R.F. Load for TE.
4. Modulation Meter.
Loop Simulator
Audio Frequency
Signal Generator
Base Unit of TE
RF Stanrdard Load
Modulation Meter
for TE
Figure 30 Modulation sensitivity test configuration
5.3.3.3 Audio distortion
Requirement : The audio distortion is the voltage ratio, usually expressed as a percentage of the rms
value of the undesired signal of the transmitter's demodulated output tot the rms value of
the complete signal at the output of the transmitter's demodulator. (specification：< 5%).
Purpose: The Audio Input signal produce ±3KHz Deviation is to modulate its distortion in order to
assure its quality.
Test Method:
1. Audio distortion test configuration as Fig. 31.
2. Test method of measuring Audio distortion
(1) Set Audio Frequency at 1000Hz and adjust the output level to produce 60% of the
rated system deviation.
(2) Measure and record the audio distortion of the transmitter.
Loop Simulator
Audio Frequency
Distortion Meter
Signal Generator
EUT
RF Stanrdard Load
for TE
Figure 31 Audio distortion test configuration
Test equipment:
1. Loop Simulator.
42
Modulation Meter
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
2. Standard R.F. Load for TE.
3. Audio Frequency Signal Generator.
4. Modulation Meter.
5. Distortion Meter.
5.3.4 Receiver requirement
5.3.4.1 Useable sensitivity
Requirement: The level of receiver input signal at a specified frequency with specified
modulation which will result in the standard SINAD at the output of the receiver.
Specification:<2.0μV.
Purpose：Testing the ability of Receiving signal for the transmitter.
Test method:
1. Usable sensitivity test configuration as Fig. 32.
RF Signal
SINAD
EUT
Generator.
AF- Load
METER
Figure 32 Usable sensitivity test configuration
2. Test method of measuring Usable sensitivity
(1) Apply a standard input signal to the receiver input terminals.
(2) Adjust the output level of RF signal generator to let the receiver reach the standard
12 dB SINAD.
(3) Such RF signal level is useable sensitivity.
Test equipment:
1. RF Signal Generator.
2. AF-Load.
3. SINAD Meter.
5.3.4.2 Useable bandwidth
Requirement: The useable Bandwidth is the input signal frequency displacement that reduces the
SINAD produced by a signal 6dB in the reference sensitivity of the standard 12 dB SINAD.
Specification：Over±500 Hz.
Purpose:The Useable Bandwidth is testing shift frequency of Base Unit for receiving in order to
reduce the sensitivity of Bandwidth by 6 dB.
Test method:
1. Useable bandwidth test configuration as Fig. 33.
2. Test method of measuring Useable bandwidth
(1) Sending a standard input signal from RF signal generator to the input of receiver.
(2) Adjust RF signal generator and adjust its level to a value that produces 12 dB
43
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
SINAD reference sensitivity.
(3) The output level of RF signal generator is the level of sensitivity (Reference
Sensitivisty).
(4) Increase the signal level by 6dB.
(5) Increase the input signal frequency until the 12 dB SINAD reference sensitivity is
obtained Record this frequency as FM.
(6) SINAD reference sensitivity is abtained. Record this frequency ad FL.
(7) Calculate the frequency differences by the following:
GDIFF1= FH - nominal frequency.
GDIFF2= nominal frequency –FL.
The smaller of GDIFF1, or GDIFF2 is the useable Bandwidth.
Test equipment:
1. RF Signal Generator.
2. AF-Load.
3. Audio Frequency Distortion Meter.
RF Signal
SINAD
EUT
Generator.
Figure 33
AF- Load
METER
Useable bandwidth test configuration
5.3.4.3 Audio distortion
Requirement: The audio distortion is the voltage ratio, usually expressed as a percentage of the rms
value of the undesired signal to the rms value of the complete signal at the output of the
receiver. (Specification: < 5%).
Purpose: The Audio distortion is testing the distortion rate of Receiving signal in order to assure its
quality.
Test method:
1. Audio distortion test configuration as Fig. 34.
2. Test method of measuring Audio distortion
(1) RF Signal Generator apply a standard input signal to the receive input terminals.
(2) Measure and record the audio distortion readings.
RF Signal
EUT
Generator.
AF- Load
Distortion
meter
Figure 34
Audio distortion test configuration
Test equipment:
44
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
1. RF Signal Generator.
2. AF-Load.
3. Distortion Meter.
5.3.4.4 Signal and noise ratio
Requirement: The ratio of the rated output power to the residual output power in the absence of
modulation, measured at standard input signal level. Specification: > 40dB.
Purpose：The signal and Noise Ratio is testing the ratio between signal and noise of output power in
the absence of modulation circumstance.
Test method:
1. Signal and noise ratio test configuration as Fig. 35.
2. Test method of measuring Signal and noise ratio
(1) Apply a standard input signal to the receiver.
(2) Record the audio output level as V1.
(3) Remove the modulation in the RF Sigal Generator and record the audio output level
as V2.
(4) Calculated as signal to Noise Ratio=20log(V1/V2).
RF Signal
SINAD
EUT
Generator.
AF- Load
METER
Figure 35 Signal and noise ratio test configuration
Test equipment:
1. RF-Signal Generator.
2. AF-Load.
3. SINAD Meter.
5.3.4.5 Adjacent channel rejection
Requirement: The adjacent channel rejection is the ratio of the level of an adjacent input signal
that causes the SINAD produced by a wanted signal 3 dB in excess of the reference
sensitivity to be reduced to the standard 12 dB SINAD to the reference sensitivity.
Specification：> 45dB.
Purpose：The Adjacent channel Rejection is the testing the Receiving of transmitter is to avoid to the
possibility of rejection from adjacent channel.
Test method:
1. Adjacent channel rejection test configuration as Fig. 36.
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PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
RF Signal
SINAD
Generator B
METER
RF Signal
RF Mixer
Generator A
EUT
AF- Load
Figure 36 Adjacent channel rejection test configuration
2. Test method of measuring Adjacent channel rejection
(1) Power off the RF - Signal Generator B.
(2) RF - Signal Generator A send out the standard nput signal.
(3) Record the signal level P0 of EUT receiving reference sensitivity.
(4) Increase the input signal level 3dB.
(5) Power on the RF - Signal Generator B and apply an input signal modulated with
400 Hz at 60% of the maximum permissible frequency deviation to adjacent
channel.
(6) Adjust the signal level between one channel and its adjacent channel to reach the
reference sensitivity of receiver signal frequency, record their channel levels as P1
and P2.
(7) Calculate the Adjacent channel rejection:
The adjacent channel rejection high = P1 – P0.
The adjacent channel rejection low = P2 – P0.
Test equipment:
1. RF-Signal Generator  2.
2. RF Mixer.
3. SINAD Meter.
4. AF-Load.
5.3.4.6 Spurious response rejection
Requirement: Spurious response rejection is to keep the spurious response signal less than input
signal of receiver to avoid the spurious response. Specification：>35 dB.
Purpose：The Spurious response rejection is testing the receiving of TE is to avoid to the possibility
of Interference from unwanted signal in output port.
Test method:
1. Spurious response rejection test configuration as Fig. 37.
46
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
RF Signal
SINAD
Generator B
METER
RF Signal
RF Mixer
Generator A
EUT
AF- Load
Figure 37 Spurious response rejection test configuration
2. Test method of Spurious response rejection.
(1) Power off the RF - Signal Generator B.
(2) RF - Signal Generator A send out the standard nput signal.
(3) Record the signal level P0 of EUT receiving reference sensitivity.
(4) Increase the input signal level 3dB.
(5) Power on the RF - Signal Generator B and apply an input signal modulated with
400 Hz at 60% of the maximum permissible frequency deviation to adjacent
channel.
(6) Adjust the Spurious response frequency from receiver 1/2 middle frequency to
double receiver frequency (except the receiver frequency in ±100kHz), adjust the
Spurious response frequency to the maximum effect.
(7) Adjust the input signal level of Spurious respons to reach the reference sensitivity
and record the signal level of Spurious respons as P1.
(8) Calculate the Spurious respons rejection = P1 - P0
Test method:
1. RF-Signal Generator  2.
2. RF Mixer.
3. SINAD Meter.
4. AF-Load.
5.3.5 Radiated Field Intensity and Interference test
Requirement: The radiated field intensity at 3 meter distance should be less than 10000μV / m. The
radiated field intensity at 3 meter distance of harmonied frequency and unwanted power
should be less than the requirements list in the table 6 below:
Purpose：To measure the radiated field intensity of harmonied frequency and unwanted power of
cordless telephone handset at transmission and receiving states to prevent the interference.
Test method: According to CNS 13438.
Test equipment: According to CNS 13438.
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PSTN01
November 17,2003
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Telecom Technical
Specifications
Table 6
Frequency
Maximum field intensity at 3 m
Maximum field intensity at 3 m
(MHz)
of harmonied frequency (μV/m)
of unwanted power (μV/m)
25 ~ 88
100
100
88 ~ 216
150
150
216 ~ 1000
200
200
5.4 Transmission characteristics of public automatic switching exchange
5.4.1 General function
5.4.1.1 AC Power Failure
Requirement:
1. When AC power is failed, PABX should keep at least on line for emergency dialing.
2. PABX system on restoration of ac power shall keep the services been set up till the time
just before the restoration of ac power.
3. The operation instruction or user manual should have instruction to ac power failed.
Purpose: To assure PBX can provide emergency telephone function when lost or recovery of AC
power supplied.
Test method:
1. Lost of AC power test configuration as Fig. 38.
2. Test method of AC Power Failure:
(1) Without supplying the AC power to TE.
(2) Set a on line communication to one PSTN line from extension line.Reference the
operation manual of vendor.
(3) Plug in the AC power.
(4) Check TE should keep the communication status of being set up.
Test equipment:
1. Loop Simulator.
EUT
Loop Simulator
AC power source
Figure 38. AC power failure test configuration
5.4.1.2 Release of the PSTN Line
Requirement: The release of PSTN line should be within 3 seconds after the extension line is
released or interrupted by console.
Purpose: To prevent call intrusion of PSTN lines.
Test method:
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PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
1. Release the PSTN Line test configuration as Fig. 39.
2. Test method of Release of the PSTN Line:
(1) Set the extension telephone on line and in communication to PSTN line.
(2) Set the extension telephone off line, the PSTN line will be released.
(3) Record the DC voltage and measure the timing from the extension line released to
PSTN line is released.
Storaged Type Oscilloscope
CH1
Loop
P ST N
P o rt
CH2
EUT
Ex t.
P o rt
Telephone
Simulator
set
Figure 39 Release of the PSTN Line test configuration
Test equipment:
1. Loop Simulator.
2. Storaged Type Oscilloscope.
3. Telephone.
5.4.2 Quiescent state noise
Requirement: The Quiescent state noise of each PSTN port should be less than 1.5mVp ( 36 dBrnc).
Purpose: To assure the quality of communication in PSTN.
Test method:
1. Quiescent state noise test configuration as Fig. 40.
2. Quiescent state noise Test method:
(1) Connecting 600Ω load and set a communication to PSTN line.
(2) Bandpass Filter set at frequency of 200 Hz to 4000 Hz.
(3) Measuring the peak noise level at PSTN port.
Note: Bandpass filter and voltameter can be substituded by spectrum analyzer.
Test equipment:
1. Loop Simulator.
2. Bandpass Filter.
3. AC Voltameter.
4. 600ΩReference Load.
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PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
Bandpass Filter
AC Voltmeter
600Ω
Loop
P ST N
P o rt
EUT
Ex t.
P o rt
Reference
Simulator
Load
Figure 40 Quiescent state noise test configuration
5.4.3 Transmission Loss
Requirement: Transmission loss of extension port to PSTN port should be less than 2 dB.
Purpose: To assure a good quality of through port communication.
Test method:
1. Transmission loss test configuration as Fig. 41.
AC Voltmeter
C:2uF±10%
600Ω
Loop
AC Signal
EUT
Reference
Simulator
Generator
P ST N
P o rt
sw
Ext.
Load
Port
Figure 41 Transmission loss test configuration
2. Transmission loss Test method:
(1) Connecting 600Ω load and set extension port in communication with PSTN port.
(2) Set AC Signal Generator in connection to loop simulator.
(3) Adjust the level of 1000 Hz signal to get 0 dBV output at PSTN port.
(4) Measure the input signal level V1( in dBV) at the extension port.
(5) Caculate the Transmission loss = 0 – V1.
(6) Set AC Signal Generator in connection to 600Ω load.
(7) Adjust the level of 1000 Hz signal to get 0 dBV output at extension port.
(8) Measure the input signal level V2( in dBV) at the PSTN port.
(9) Caculate the Transmission loss = 0 – V2.
(10) Select the higher value from the results of step (5) and (9).
(11) Selecting another port of extensions and PSTN lines, repeat step (1) to (10).
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PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
(12) The maximum value get from step (1) to (11) is the Transmission loss.
Test equipment:
1. AC Signal Generator.
2. Loop Simulator.
3. AC Voltmeter.
4. 600 Reference Load.
5.4.4 Cross talk
Requirement: The crosstalk loss of 1 kHz signal should be more than 65 dB. For any TE with more
than two PSTN ports.
Purpose: To assure good quality of communication and not be interfered by another communication
lines in another PSTN port.
Test method:
1. Crosstalk test configuration as Fig. 42.
Spectrum Analyzer
600Ω
Loop
P ST N
P o rt 1
Simulator
Reference
Load
EUT
Ext.
Port 1
C:2uF±10%
600Ω
Loop
AC Signal
Simulator
SW
P ST N
P o rt 2
Generator
Ext.
Port 2
Reference
Load
Figure 42 Crosstalk test configuration
2. Crosstalk Test method:
(1) Set two connections with PSTN lines by two referenced 600Ω reference load.
(2) Set AC Signal Gerenator to connect with loop simulator.
(3) Adjust Signal Generator to get 1 kHz 0 dBV at PSTN port 2.
(4) PSTN port 1 and Ext. port 1 is no signals applied.
(5) Set spectrum analyzer frequency range at 200 Hz to 4000 Hz.
(6) Measuring the peak level Vp1 at PSTN port 1 and Ext. Port 1(dBv)
(7) Caculate crosstalk loss = 0 – Vp1.
(8) Set AC Signal Generator to connect with reference 600Ω load. repeat step (3) to
(7).
(9) Selecting another port of extensions and PSTN lines of EUT, repeat step (1) to (8).
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PSTN01
November 17,2003
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Specifications
(10) The minimum value get from step (1) to (9) is the crosstalk loss.
Test equipment:
1. AC Signal Generator.
2. Loop Simulator  2.
3. Spectrum Analyzer.
4. 600Ω Reference Load  2.
5.5 Protocol requirement
Data Equipments using communication protocal should follow the recommandations of ITU-T.
A declaration of conformance to this requirement should be provided from the supplier.
5.6 Caller ID requirement
5.6.1 FSK signals inspection standard
The test case and definition of test data is attached in Appendix I.
5.6.1.1 AC / DC Termination
5.6.1.1.1DC Termination
Requirement: The controller is set to transmit a valid alerting signal to the TE to place in the signal
state. The current drawn by TE in the signal state is calculated from measurement of the
voltage across R1.
The current drawn by TE shall not exceed 0.5 mA.
Purpose: To make sure the loop current drawn by the caller ID equipment is not over the limits lead
to on line state of PSTN.
Test method：
1. DC termination test configuration as Figure 43.
Storage Type
Oscilloscope
C:2μF±
10%
C:2uF
Simulated
1kΩ
±
Loop
Signal
Simulated
Generator
Figure 43 DC termination test configuration
2. DC termination test method:
(1) Set the Simulated Signal Generator to send the alerting signal.
(2) Check the EUT is at signal state.
(3) Measure and record the DC voltage on the 1 kΩ resistor.
(4) Caculate the DC current = V / 1000.
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EUT
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
Test equipment:
1. Simulated Signal Generator.
2. Loop Simulator
3. Storage Type Oscilloscope.
5.6.1.1.2 AC Termination
Requirement:During the signaling state the TE shall present the following AC conditions: an
impedance not less than 8 kΩ, but with a phase angle not exceeding +5° over the frequency
range 200 Hz to 4 000 Hz; Compliance shall be by suppliers declaration.
Purpose: To make sure the input impedance can meet the requirement of PSTN.
Test method：
1. AC termination test configuration as Figure 44.
Storage Type Oscilloscope
CH1
CH2
C:2μF±10%
1kΩ
AC Signal
Loop
Generator
Simulator
V2
V1
EUT
Figure 44 AC termination test configuration
2. AC termination test method:
(1) Set the EUT at signal state.
(2) Set the Simulated Signal Generator to send 200 Hz signal and adjust the level of
V1= 3Vrms at EUT side.
(3) Measure and record the AC voltage level of V2.
(4) Caculate the AC impedance Z = V1 / (V2  1000).
(5) Use Storage Type Oscilloscope to measure and record signal of V1 and V2.
(6) Caculate the phase angleθby:
θ= △t 50ms  360.
△ t : the difference of timeing V1 and V2.
(7) Repeat steps (3) to (6) by set the AC Signal Generator to send from 200 Hz to
4000Hz signal.
Test equipment:
1. AC Signal Generator.
2. Loop Simulator.
3. Storage Type Oscilloscope.
4. AC Voltage Meter V1, V2
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PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
5.6.1.2 Timing
5.6.1.2.1 Alerting case
Requirement:The controller is set to transmit the test packet TP1 to the TEUT for each following test
cases.
Table 7: Timing requirements DT-AS
TAS case
Modem case
Result
DT1
FSK1
Correct reception of FSK data
DT2
FSK1
Correct reception of FSK data
DT4 first ring pattern
FSK1
TEUT return to the idle state at the start
starts 1 sec after end of
of first ring pattern
TAS single ring burst
No message or error displayed
DT4
No data packet
TEUT return to the idle state
DT4
FSK1
Correct reception of FSK data
DT5
FSK1
Correct reception of FSK data
Purpose: To make sure the correct function of caller ID equipment at each signal condition.
Test method：
1. Alerting case test configuration as Figure 45.
Simulated
C:2μF±10%
Signal
Loop
Generator
Simulator
EUT
Figure 45 Alerting case test configuration
2. Alerting case test method:
(1) Set the EUT at idle state.
(2) Set the Simulated Signal Generator to send signal of each TAS case and Modem
case as listed in table 6.1 and sending the message of test pattern TP1.
(3) After the EUT received the signals, check the result with Table 7.
Test equipment:
1. Simulated Signal Generator.
2. Loop Simulator.
5.6.1.2.2 Start Time
Requirement: The TE shall enter the signaling state within 45ms from the end of the DT-AS.
Compliance shall be by supplier declaration.
Purpose: To make sure caller ID can receive FSK signal after DT-AS signal is received.
Test method：
1. Start Time test configuration as Figure 45.
2. Start Time test method:
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PSTN01
November 17,2003
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Telecom Technical
Specifications
(1) Set the EUT at idle state.
(2) Set the Simulated Signal Generator to send DTAS(Dual tone alert signal) and after
45ms, send the FSK Data Signal.
(3) Check the FSK Data received by the EUT is correct as set in step (2).
Test equipment:
1. Simulated Signal Generator.
2. Loop Simulator.
5.6.1.2.3 End Time
Requirement:The TE shall leave the signaling state and revert to the idle state within 150ms from
when the caller display message has been completely signaled. Compliance shall be by
supplier declaration.
Purpose: To make sure caller ID can go back to idle state after the FSK signal is received.
Test method：
1. End Time test configuration as Figure 45.
2. End Time test method:
(1) Set the Simulated Signal Generator to send FSK1 Data Signals and after 150ms,
send the FSK2 Data Signal.
(2) Check FSK1 Data is only recevied by EUT.
Test equipment:
1. Simulated Signal Generator.
2. Loop Simulator.
5.6.1.3 Signaling case
5.6.1.3.1 Frequency, Level, Twist and Interference tolerance
Requirement:The controller is set to transmit the test packet TP1 to the EUT for table 8 each test
cases.
Purpose: To make sure caller ID can correctively receiving the FSK signals.
Test method：
1. Frequency, Level, Twist and Interference tolerance test configuration as Figure 45.
2. Frequency, Level, Twist and Interference tolerance test method:
(1) Set the EUT is at idle state.
(2) Set the Simulated Signal Generator to send signal of each TAS case and Modem
case as listed in table 6.2 and sending the message of test pattern TP1.
(3) After the EUT received the signals, check the result with Table 8.
Table 8: Signaling requirements
TAS case
Modem case
Result
DT5
FSK1
Correct reception of FSK data
DT5
FSK2
Correct reception of FSK data
DT5
FSK3
Correct reception of FSK data
Test equipment:
1. Simulated Signal Generator.
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PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
2. Loop Simulator.
5.6.1.4 Packet case
5.6.1.4.1 Channel seizure
Requirement: The controller is set to transmit the test message DT5:FSK1:TP1 to the EUT. Check
the message is correctly interpreted by the EUT.
Purpose: To make sure caller ID can correctively receiving the FSK signals.
Test method：
1. Channel seizure test configuration as Figure 45.
2. Channel seizure test method:
(1) Set the EUT at idle state.
(2) Set the Simulated Signal Generator to send test data of DT5:FSK1:TP1.
(3) Check the data is received and displayed on EUT correctly.
Test equipment:
1. Simulated Signal Generator.
2. Loop Simulator.
5.6.1.4.2 Mark
Requirement:The controller is set to transmit the test message DT5:FSK1:TP1 to the EUT. Check
the message is correctly interpreted by the EUT.
Purpose: To make sure caller ID can correctively receiving the signals.
Test method：
1. Mark test configuration as Figure 45.
2. Mark test method:
(1) Set the EUT at idle state.
(2) Set the Simulated Signal Generator to send test data of DT5:FSK1:TP1.
(4) Check the data is received and displayed on EUT correctly.
Test equipment:
1. Simulated Signal Generator.
2. Loop Simulator.
5.6.1.4.3 Message type
Requirement:The controller is set to transmit the following test message to the EUT.
Check that each message is correctly interpreted by the EUT.
Table 9 Message Type
Test data
Test case
Result
DT5:FSK1:TP1
(call setup type message)
Correct reception of FSK data
DT5:FSK1:TP2
(message waiting indicator type message) Correct reception of FSK data
(* Optional)
(test on/off alternate)
DT5:FSK1:TP5
(non call setup type message)
rejected or an error message
Note: the function of caller ID is optional for this item.
Purpose: To make sure caller ID can correctively receiving the FSK signals.
Test method：
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PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
1. Message type test configuration as Figure 45.
2. Message type test method:
(1) Set the EUT at idle state.
(2) Set the Simulated Signal Generator to send smessages as listed in table 9.
(3) Check the results of EUT meet with Table 9.
Test equipment:
1. Simulated Signal Generator.
2. Loop Simulator.
5.6.1.4.4 Checksum
Requirement: The controller is set to transmit the test message DT5:FSK1:TP6 to the EUT (incorrect
checksum). Check the message is correctly rejected or an error message displayed by the
EUT.
Purpose: To make sure caller ID can detect the error messages.
Test method：
1. Checksum test configuration as Figure 45.
2. Checksum test method:
(1) Set the EUT at idle state.
(2) Set the Simulated Signal Generator to send test data of DT5:FSK1:TP6.
(3) Check the message is correctly rejected or an error message is displayed on the
EUT.
Test equipment:
1. Simulated Signal Generator.
2. Loop Simulator.
5.6.1.5 Presentation layer messages case
Requirement:The test controller is set to transmit the test messages as listed in Table 10 to the EUT.
Check that each message is correctly interpreted by the EUT.
Purpose: To make sure caller ID can correctively receiving and displaying the FSK signals.
Test method：
1. Presentation layer messages case test configuration as Figure 45.
2. Presentation layer messages case test method:
(1) Set the EUT at idle state.
(2) Set the Simulated Signal Generator to send smessages as listed in table 10.
(3) Check the results of EUT meet with Table 10.
Test equipment:
1. Simulated Signal Generator.
2. Loop Simulator.
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PSTN01
November 17,2003
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Telecom Technical
Specifications
Table 10: Presentation layer messages
Test data
Test case
Result
DT5:FSK1:TP7
Call type: ring back when free
Message ignore
(valid CLI message)
DT5:FSK1:TP8
Call type: absent (valid CLI
Correct reception of FSK data
message)
DT5:FSK1:TP9
Call type: voice (valid CLI
Correct reception of FSK data
message)
DT5:FSK1:TP10
Call type: voice (valid CLI
Correct reception of FSK data
message)
DT5:FSK1:TP11
DT5:FSK1:TP13
Call type: message waiting(valid Message either ignore or
message)
Correctly displayed
Call type: voice (maximum
Correct reception of FSK data
length valid CLI message)
DT5:FSK1:TP14
Call type: voice (valid CLI
(* Optional)
message)
DT5:FSK1:TP15
Call type: voice (valid CLI
(* Optional)
message)
Correct reception of FSK data
Correct reception of FSK data
Note: the function of caller ID is optional for this item.
5.6.2 DTMF signaling Test criteria
The following test cases and data is defined as Appendix II.
5.6.2.1 DC resistance in the NIT state
Requirement: In the NIT state the DC resistance between the line terminals shall be great than
90 kΩ.
Purpose: To make sure the impedance of caller ID is no interference to PSTN.
Test method：
1. DC resistance in the NIT state test configuration as Figure 46.
DC Current Meter
EUT
Loop
Simulator
Figure 46 DC resistance in the NIT state test configuration
2. DC resistance in the NIT state test method:
(1) Set the EUT at NIT state.
(2) Measure and record the DC current Idc.
(3) Caculate the DC resistance = 48V / Idc.
Test equipment:
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PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
1. Loop Simulator.
2. DC Current Meter.
5.6.2.2 Leaving the NIT state
Requirement: When the number information transfer is completed, the TE shall leave the NIT state
and return to the quiescent condition with the ringing function.
Criteria for leaving the NIT state.
The transfer of number information is to be regarded as completed when one of the
following criteria are met:
1. The DTMF code "C" (end code) is received;
2. Ringing signal is received;
3. After receipt of a DTMF code the DTMF pause condition is present for more than 1 sec.
At least the criteria 2. And 3. Shall be supported by the TE, as these criteria will guarantee
in both normal and abnormal number information transfer procedures, that the NIT state is
left before or as soon as possible after the line comes into loop condition.
Purpose: To make sure caller ID can go back to idle state after the DTMF signal is received.
Test method：
1. Leaving the NIT state test configuration as Figure 46.
2. Leaving the NIT state test method:
(1) Set the EUT at idle state.
(2) Set the Simulated Signal Generator to send test signals of DTMF1 data / End Code /
DTMF2 data.
(3) Check there is only DTMF1 data displayed on EUT.
(4) Set the Simulated Signal Generator to send test signals of DTMF1 data / Ringing
Signal / DTMF2 data.
(5) Check there is only DTMF1 data displayed on EUT.
(6) Set the Simulated Signal Generator to send test signals of DTMF1 data, stop to wait
for 1 second then send test signals of DTMF2 data.
(7) Check there is only DTMF1 data displayed on EUT.
Test equipment:
1. Simulated Signal Generator.
2. Loop Simulator.
5.6.2.3 DTMF signaling
Requirement:The Tolerance of Frequencies, Timing, Level and differences features of DTMF codes
received between the line terminals is performed as following table 11.
The EUT receiver performance must be:
1. Receiving Level (High, Low Group):-3 to -24dBm.
2. Maximum level difference between two frequencies:5dB.
3. Frequency tolerance: within +/- 1.5%.
Purpose: To make sure capability of caller ID in receiving the DTMF signals.
Test method：
1. DTMF signaling test configuration as Figure 45.
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PSTN01
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Telecom Technical
Specifications
2. DTMF signaling test method:
(1) Set the EUT at idle state.
(2) Set the Simulated Signal Generator to send test signals as the limits in the
requirements of the Receiving Level, Maximum Level Difference between two
frequencies, Frequency Tolerance and the conditions and code listed in Table 11.
(3) Check the correct code is displayed on EUT.
Table 11 DTMF signals
Signaling
Code
Result
Case
Number
DS1
TC2
Correct reception of number
DS2
TC2
Correct reception of number
DS3
TC2
Correct reception of number
DS4
TC2
Correct reception of number
DS5
TC2
Correct reception of number
Test equipment:
1. Simulated Signal Generator.
2. Loop Simulator.
5.6.2.4 DTMF Code / Number
Requirement:
Purpose: To make sure capability of caller ID in receiving the DTMF signals.
Test method：
1. DTMF Code / Number test configuration as Figure 45.
2. DTMF Code / Number test method:
(1) Set the EUT at idle state.
(2) Set the Simulated Signal Generator to send each Signaling Case and numbers as
listed in Table 12.
(3) Check the results of EUT meet with Table 12.
Test equipment:
1. Simulated Signal Generator.
2. Loop Simulator.
Table 12 DTMF Code/Number
Signaling Case
Code / Number
Result
DS1
TC1
Correct reception of number
DS1
TC3
Call restriction
DS1
TC4
Call restriction
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PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
5.6.2.5 Guarding against interference from the parallel equipment
Requirement:The Caller ID must guard against interference from the parallel equipment which is in
communication state.
Purpose: To make sure the Caller ID can guard against interference from the parallel Terminal
equipment which is in communication state.
Test method：
1. Test configuration of guarding against interference from the parallel equipment is as
Figure 47.
2. Test method of guarding against interference from the parallel equipment:
(1) Set the EUT at idle state.
(2) Set parallel TE at Off Line state.
(3) Set the Simulated Signal Generator to send DTMF Signaling Case and Numbers.
(4) Check there shall be no error of codes displayed on EUT.
C:2μF±10%
Parallel
Simulated
Loop
Signal
EUT
Simulator
Terminal
Equipment
Generator
Figure 47 Test configuration of guarding against interference
from the parallel equipment
Test equipment:
1. Simulated Signal Generator.
2. Loop Simulator
3. Telephone set.
5.7 Automatic redialing function requirement
5.7.1 Automatic dialing function requirement
5.7.1.1 Automatic repeated call attempts
Requirement:
1. If an automatic repeated dial without dial tone detection, the dial digit should not send
out within 2 seconds after on line.
2. The Automatic repeated call should be equal or no more than 2 attempts and should wait
more than or equal 1 minute after previor attemp.
3. The Automatic repeated call is no limits on attempts if the wait time of repeated call is
more than or equal 3 minutes after previor attemp.
4. For Emergency call, the repeated call attempt is no limited.
Purpose: To prevent the unreasonable wast to the using of PSTN source.
Test method：
61
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
1. Automatic repeated call attempts test circuit as Figure 48.
2. Automatic repeated call attempts test method:
(1) Set loop simulator without sending dial tone and with sending busy tone after
received all digits of the call.
(2) Set TE to automatic repeated call attemp mode.
(3) Measure and record the AC and DC voltage on the line of the test.
(4) Caculate the time from loop start to first digit sent out.
(5) Caculate the time from TE goes off line to the next on line.
(6) Count the total attempts of repeated calls, not including the first call.
Storage Type Oscilloscope
CH1
CH2
Loop
100Ω
Simulator
EUT
Figure 48 Automatic repeated call attempts test circuit
Test equipment:
1. Loop Simulator.
2. Storage Type Oscilloscope.
5.7.1.2 Disconnection Time of automatic dialing
Requirement:
1. Disconnection Time should be less than 20 seconds after busy tone send out.
2. Disconnection Time should be less than 2 minutes of no answering ring back signals.
Purpose: To prevent the unreasonable design of TE to waisting of PSTN source.
Test method：
1. Disconnection Time of automatic dialing test as Figure 48.
2. Disconnection Time of automatic dialing test method:
(1) Loop simulator set to send busy tone after receiving the dial digits.
(2) TE set at automatic dial mode.
(3) Measuring the AC and DC voltage during all the test.
(4) Caculate the time when last digit dialled to release the line.
(5) Loop simulator set to send ring back tone after receiving the dial digits.
(6) Repaet step (2) to (4).
Test equipment:
1. Loop Simulator.
2. Storage Type Oscilloscope.
62
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
5.7.2 Automatic answer function requirement
Requirement: TE with Automatic answer function should
(1) Seizure the calling line before receiving more than 3 cycle rings.
(2) Release the line before passing more than 3 seconds after the calling party released the
line at the other side.
Note: Item(2) is only suitable for the moden function TTE.
Purpose: To prevent the unreasonable design of TE in waisting of PSTN source.
Test method：
1. Automatic answering function test as Figure 49.
2. Automatic answering function test method:
(1) Set TE at on-hook mode.
(2) Using the calling party equipment diall to theTE.
(3) Loop simulator will send rings to TE.
(4) Count the number of rings received by TE till the line is seizured.
(5) Change calling side to turn to on-hook mode.
(6) Wait untill TE turn to on-hook mode.
(7) Record the timing and DC voltage in step (5) to (6).
(8) Caculate the time between calling party release the line and TE release the line.
Storage Type Oscilloscope
CH1
CH2
Calling
Loop
Party
Simulator
Equipment
Figure 49 Automatic answering function test configuration
Test equipment:
1. Calling Party Equipment.
2. Storage Type Oscilloscope.
3. Loop Simulator.
63
EUT
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
Appendix I FSK Test status and Test Data
TABLE I.1: DT-AS DETECTION
case
DT1
DT2
DT4
DT5
frequency (Hz)
2120 and 2737
2140 and 2763
2140 and 2763
2130 and 2750
Level (dBV)
-10
-10
-30
-20
Twist (dB)
6
6
6
0
Duration (msec)
90
110
110
100
Validity
valid
valid
valid
valid
TABLE I.2:FSK SIGNALING CONDITIONS
parameter
FSK1
FSK2
FSK3
mark frequency (Hz) (logic 1)
1300
1280.5
1319.5
space frequency (Hz) (logic 0)
2100
2068.5
2131.5
Mark level (dBV) (between A-wire, B-wire)
-20
-36
-4
Space level (dBV) (between A-wire, B-wire)
-20
-30
-10
Interfering signal power level (dB)
none
-25
-25
Table I.3:Data Link Packet Structure
Test packet type
TP1
TP2
TP4
TP5
TP6
TP7
TP8
TP9
TP10 TP11 TP13 TP14 TP15
Channel seize
SZ2
SZ2
SZ2
SZ2
SZ2
SZ2
SZ2
SZ2
SZ2
Mark period
MK1 MK1 MK1 MK1 MK1 MK1 MK1 MK1 MK1 MK1 MK1 MK1 MK1
Message type
MT1 MT3 MT1 MT2 MT1 MT1 MT1 MT1 MT1 MT1 MT1 MT1 MT1
Presentation
PM1 PM9 PM1 PM1 PM1 PM2 PM3 PM4 PM5 PM6 PM8 PM10 PM11
SZ2
SZ2
SZ2
SZ2
message
checksum
CH1 CH1 CH1 CH1 CH2 CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1
64
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
TABLE I.4: PRESENTATION LAYER TEST MESSAGES
presentation layer message type PM1
PM2
PM3
PM4
PM5
PM6
PM8
PM9
PM10 PM11
Message length (byte)
ML1
ML1
ML2
ML3
ML3
ML4
ML6
ML7
ML3
ML3
(38)
(38)
(35)
(29)
(29)
(3)
(75)
(28)
(29)
(29)
Call type (3)
CT1
CT2
-
CT1
CT1
CT3
CT1
CT3
CT1
CT1
Time and date (10)
TD1
TD1
TD1
TD1
TD1
-
TD1
TD1
TD1
TD1
Calling line identity (12/18)
CL1
CL1
CL1
-
-
-
CL3
CL1
-
-
Called line identity
CL2
CL2
CL2
CL2
CL2
-
CL4
-
CL2
CL2
-
-
-
RA1
RA2
-
-
-
RA3
RA4
Visual indicator (3)
-
-
-
-
-
-
-
VI1
-
-
First Called line identity (12)
-
-
-
-
-
-
FC1
-
-
-
Network message system status -
-
-
-
-
-
NS1
-
-
-
(12/11)
Reason for absence of caller
number (3)
(3)
Type of forwarded call (3)
-
-
-
-
-
-
FT1
-
-
-
Type of calling user (3)
-
-
-
-
-
-
CS1
-
-
-
Redirection number(12)
-
-
-
-
-
-
RN1
-
-
-
TABLE I.5: TEST DATA
Test
Data
Comments
SZ1
96 bits alternating mark & space
SZ2
300 bits alternating mark & space (start
ETSI channel seizure period
with space, end with mark)
MK1
80 bits continuous mark
Network operator option
MK2
25 bits continuous mark
Invalid mark period
MK3
180 bits continuous mark
ETSI preferred value mark period
CH1
Correct checksum
Calculated for each message
CH2
incorrect checksum
Calculated for each message
MT1
1000 0000
80 H
Call setup message type
MT2
1000 0001
81 H
Non call setup message type
MT3
1000 0010
82 H
Message waiting indicator message type
ML1
0010 0110
26 H
38 byte message
ML2
0010 0011
23 H
35 byte message
ML3
0001 1101
1D H
29 byte message
ML4
0000 0011
03 H
3 byte message
ML6
0100 1011
4B H
75 byte message
65
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
Table I.6: CT1 Test
CT1 test
Data
Meaning
Parameter type
0001 0001
11 H
Call type
Parameter length
0000 0001
01 H
1 byte parameter data
Parameter data
0000 0001
01 H
Voice call
TABLE I.7: CT2 TEST
CT2 test
Data
Meaning
Parameter type
0001 0001
11 H
Call type
Parameter length
0000 0001
01 H
1 byte parameter data
Parameter data
0000 0010
02 H
Ring back when free call
TABLE I.8: CT3 TEST
CT3 test
Data
Meaning
Parameter type
0001 0001
11 H
Call type
Parameter length
0000 0001
01 H
1 byte parameter data
Parameter data
1000 0001
81 H
Message waiting call
TABLE I.9: RA1 TEST
RA1 test
Data
Meaning
Parameter type
0000 0100
04 H
Reason for absence of caller number
Parameter length
0000 0001
01 H
1 byte parameter data
Parameter data
0100 1111
4F H
Caller number unavailable
TABLE I.10: RA2 TEST
RA2 test
Data
Meaning
Parameter type
0000 0100
04 H
Reason for absence of caller number
Parameter length
0000 0001
01 H
1 byte parameter data
Parameter data
0101 0000
50 H
Caller number withheld
TABLE I.11: RA3 TEST
RA3 test
Data
Meaning
Parameter type
0000 0100
04 H
Reason for absence of caller number
Parameter length
0000 0001
01 H
1 byte parameter data
Parameter data
0100 0011
43 H
Coin phone call number unavailable
TABLE I.12: RA4 TEST
RA4 test
Data
Meaning
Parameter type
0000 0100
04 H
Reason for absence of caller number
Parameter length
0000 0001
01 H
1 byte parameter data
Parameter data
0100 1001
49 H
International call number unavailable
66
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
TABLE I.13: NM1 TEST
NM1 test
Data
Meaning
Parameter type
0001 0011
13 H
Network message system status
Parameter length
0000 0001
01 H
1 byte parameter data
Parameter data
0000 0011
03 H
3 message waiting
TABLE I.14: TD1 TEST
Meaning (14:30 13rd August)
TD1 test
Data
Parameter type
0000 0001
01 H
Time & date
Parameter length
0000 1000
08 H
8 byte parameter data
Parameter data
0011 0000
30 H
0
Parameter data
0011 1000
38 H
8
Parameter data
0011 0001
31 H
1
Parameter data
0011 0011
33 H
3
Parameter data
0011 0001
31 H
1
Parameter data
0011 0100
34 H
4
Parameter data
0011 0011
33 H
3
Parameter data
0011 0000
30 H
0
TABLE I.15: CL1 TEST
CL1 test
Data
Meaning ( 0936275234 )
Parameter type
0000 0010
02 H
Calling line directory number
Parameter length
0000 1010
0A H
10 byte parameter data
Parameter data
0011 0000
30 H
0
Parameter data
0011 1001
39 H
9
Parameter data
0011 0011
33 H
3
Parameter data
0011 0110
36 H
6
Parameter data
0011 0010
32 H
2
Parameter data
0011 0111
37 H
7
Parameter data
0011 0101
35 H
5
Parameter data
0011 0010
32 H
2
Parameter data
0011 0011
33 H
3
Parameter data
0011 0100
34 H
4
67
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
TABLE I.16: CL2 TEST
CL2 test
Data
Meaning ( 0223433657 )
Parameter type
0000 0011
03 H
Called line directory number
Parameter length
0000 1010
0A H
10 byte parameter data
Parameter data
0011 0000
30 H
0
Parameter data
0011 0010
32 H
2
Parameter data
0011 0010
32 H
2
Parameter data
0011 0011
33 H
3
Parameter data
0011 0100
34 H
4
Parameter data
0011 0011
33 H
3
Parameter data
0011 0011
33 H
3
Parameter data
0011 0110
36 H
6
Parameter data
0011 0101
35 H
5
Parameter data
0011 0111
37 H
7
TABLE I.17: CL3 TEST
CL3 test
Data
Meaning (maximum length number)
Parameter type
0000 0010
02 H
Calling line directory number
Parameter length
0001 0010
10 H
16 byte parameter data
Parameter data
0011 0000
30 H
0
Parameter data
0011 0000
30 H
0
Parameter data
0011 0010
32 H
2
Parameter data
0011 0001
31 H
1
Parameter data
0011 0010
32 H
2
Parameter data
0011 0011
33 H
3
Parameter data
0011 0100
34 H
4
Parameter data
0011 0101
35 H
5
Parameter data
0011 0110
36 H
6
Parameter data
0011 0111
37 H
7
Parameter data
0011 0001
31 H
1
Parameter data
0011 0010
32 H
2
Parameter data
0011 0011
33 H
3
Parameter data
0011 0100
34 H
4
Parameter data
0011 0101
35 H
5
Parameter data
0011 0110
36 H
6
68
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
TABLE I.18: CL4 TEST
CL4 test
Data
Meaning (083625234)
Parameter type
0000 0011
03 H
Called line directory number
Parameter length
0000 1001
09 H
09 byte parameter data
Parameter data
0011 0000
30 H
0
Parameter data
0011 1000
38 H
8
Parameter data
0011 0011
33 H
3
Parameter data
0011 0110
36 H
6
Parameter data
0011 0010
32 H
2
Parameter data
0011 0101
35 H
5
Parameter data
0011 0010
32 H
2
Parameter data
0011 0011
33 H
3
Parameter data
0011 0100
34 H
4
TABLE I.19: FC1 TEST
FC1 test
Data
Meaning (0936275234)
Parameter type
0001 0010
12 H
First Called line directory number
Parameter length
0000 1010
0A H
10 byte parameter data
Parameter data
0011 0000
30 H
0
Parameter data
0011 1001
39 H
9
Parameter data
0011 0011
33 H
3
Parameter data
0011 0110
36 H
6
Parameter data
0011 0010
32 H
2
Parameter data
0011 0111
37 H
7
Parameter data
0011 0101
35 H
5
Parameter data
0011 0010
32 H
2
Parameter data
0011 0011
33 H
3
Parameter data
0011 0100
34 H
4
69
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
TABLE I.20: RN1 TEST
RN1 test
Data
Meaning (0223433657)
Parameter type
0001 1010
1A H
Redirection number
Parameter length
0000 1010
0A H
10 byte parameter data
Parameter data
0011 0000
30 H
0
Parameter data
0011 0010
32 H
2
Parameter data
0011 0010
32 H
2
Parameter data
0011 0011
33 H
3
Parameter data
0011 0100
34 H
4
Parameter data
0011 0011
33 H
3
Parameter data
0011 0011
33 H
3
Parameter data
0011 0110
36 H
6
Parameter data
0011 0101
35 H
5
Parameter data
0011 0111
37 H
7
TABLE I.21: VI1 TEST
VI1 test
Data
Meaning
Parameter type
0000 1011
0B H
Visual indicator
Parameter length
0000 0001
01 H
1 byte parameter data
Parameter data
1111 1111
FF H
Active on
TABLE I.22: NS1 TEST
NS1 test
Data
Meaning
Parameter type
0001 0011
13 H
Network message system status
Parameter length
0000 0001
01 H
1 byte parameter data
Parameter data
0000 0001
01 H
1 message or unspecified number of message
waiting
TABLE I.23: FT1 TEST
FT1 test
Data
Meaning
Parameter type
0001 0101
15 H
Type of forwarded call
Parameter length
0000 0001
01 H
1 byte parameter data
Parameter data
0000 0011
03 H
unconditional forwarded call
TABLE I.24: CU1 TEST
CU1 test
Data
Meaning
Parameter type
0001 0110
16 H
Type of calling user
Parameter length
0000 0001
01 H
1 byte parameter data
Parameter data
0000 1010
0A H
ordinary calling subscriber
70
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
Appendix II DTMF Test Status and Test Data
Table.II.1 TEST CASE
DTMF Signaling Conditions
CASE
DS1
DS2
DS3
DS4
DS5
frequency variation
0%
+1.5%
0%
0%
+1.5%
Level (dBm)
-13
-24
-3
-3
-24
Twist (Db)
0
5
5
5
5
Tone duration (msec)
70
90
90
50
50
interdigit pause (msec)
70
90
90
50
50
Interfering signal power level (dB)
none
-20
-20
-20
-20
Validity
valid
valid
invalid
valid
valid
Test Code / Number
PARAMETER
TC1
TC2
TC3
TC4
START CODE
D
D
D
D
CALLER NUMBER
CN1
CN2
CN3
CN4
STOP CODE
C
C
C
C
TABLE II.2 TEST DATA
Test
Data
Nots
CN1
0021456789012345
International Paging
CN2
0223433657
Domestic Paging
CN2
0
International Limited Paging
CN4
0
Domestic Limited Paging
71
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
Appendix III Recommentations of Test Environment and Test Equipments
Test environment
All tests shall be performed under non-condensing conditions at:

an ambient temperature in the range from +15℃ to +35℃

a relative humidity in the range from 45% to 85%

an air pressure in the range 86 kPa to 106 kPa
For TE which is not designed to operate over the entire specified environment range, all tests shall be performed at any
point within the operational range specified by the supplier.
Power state
Test shall be carried out with the TE power on, under normal operating conditions defined by the supplier.
For TE which is directly powered (either wholly or parity)from the mains supply, all tests shall be carried out within ±
5% of the rated voltage of the TE. If the equipment is powered by other means and those means are not supplied as
part of the apparatus (e.g. batteries, DC supplies and stabilized AC supplies) all tests shall be carried out within the
power supply limit declared by the supplier. If the power supply is AC, the test shall be conducted within ±4% of the
rated frequency.
Measurements to earth
Where a measurement to earth id defined and the supplier’s instructions state that a connection to earth is intended,
then all the following points, as applicable, shall be connected to the earth point:

a point in the TE which is intended to be connected to mains earth (in practice this might be carried out by
connecting to the earth of the mains source which is supply the TE)

connector points which are intended to be connected to earth during the normal operation of the TE.
Where the TE has no facility for connection to earth, for example by one of the above points, then the test does not
apply.
72
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
Suggested Equipment List
1.
AC current meter : range > 200mA, minimum frequency range 15 Hz to 68 Hz, accuracy +3% Full Scale(fsc).
2.
AC voltage source : output 0 Vrms to 1500 Vrms at 60 Hz, isolated with 10 mA minimum current sourcing
capability.
3.
AC volt meter : input impedance > 1 megaohm, range 0 V to 150 Vrms, minimum frequency range 15.3 Hz to 68
Hz, accuracy +3%.
4.
Bandpass filter : input impedance > 100 kilohms, bandpass 200 Hz to 4000 Hz, cutoff frequencies at the 3dB
attenuation points, out of band roll-off >24dB per octave.
5.
Bandpass filter : input impedance >100 kilohms, bandpass 4000 Hz to 48kHz, cutoff frequencies at the 3 dB
attenuation points, out-of-band roll-off >24 dB per octave.
6.
Current source: Maximum Output : 1 A.
7.
DC current meter : range 0 mA to 200 mA, accuracy +3% fsc.
8.
DC current meter : range 20μA, accuracy +3% fsc.
9.
DC power supply : output level 0 V to 200 V, maximum output current >1A.
10. DC Voltmeter : input impedance >1 megohm, range 0 V to 200 V, accuracy +3% fsc.
11. Digital sampling storage oscilloscope : input impedance >1 megohm, frequency range >6 MHz, input sensitivity
of 3 mV or better, trigger sensitivity of at least 10 mV or better, accuracy +3%.
12. Digital sampling storage oscilloscope : input impedance >1 megohm, frequency range >100 MHz, input
sensitivity of 3 mV or better, trigger sensitivity of at least 10 mV or better, accuracy +3%.
13. DS1 transmission test set capable of sending a programmed bit stream.
14. Frequency counter : input impedance >1 megohm, frequency range from 100 Hz to at least 10 MHz, input
sensitivity of 10 mV or better, resolution <1 Hz, accuracy +3 Hz.
15. Frequency generator : output impedance 600 ohms, frequency range up to at least 4 kHz, maximum output level
>40 dBm, sinusoidal output.
16. Frequency selective voltmeter : frequency range from 2000 Hz to at least 4 kHz, input impedance >10 kilohms,
balanced input, range 1μV to 1 V, accuracy +3%, bandwidth 10 Hz and 30 Hz.
17. Means to record oscilloscope and spectrum analyzer traces.
18. Multiplexer/demultiplexer for 1.544 Mb/s PCM systems with zero level encoder/decoder, may consist of one or
more descrete units which perform this function.
19. Ringing Amplifier : Output level to at least 150 V rms superimposed on 56.5 V dc, frequency range 15.3 Hz to 68
Hz.
20. Spectrum analyzer : input impedance >1 megohm, frequency range from 10 Hz to at least 6 MHz, sensitivity of
0.1 mV or better, resolution <1 Hz, accuracy +2 dB.
21. Summing Network : input and output impedances 600 ohms.
22. Type A Surge generator : output 800 V peak, having 10μs maximum front time to crest and a 560μs minimum
decay time to half crest; with a peak current capability of 100 A minimum; and the ability to generate these pulses
in both positive and negative polarity.
23. Type A Surge generator : output 1500 V peak, having 10μs maximum front time to crest and a 160μs minimum
decay time to half crest; with a peak current capability of 200 A minimum; and the ability to generate these pulses
in both positive and negative polarity.
24. Surge generator : output 2500 V peak, having 2μs maximum front time to crest and a 10μs minimum decay
time to half crest; a peak current capability of 1000 A minimum; and the ability to generate these pulses in both
positive and negative polarity; means for preventing the surge voltage from entering the feeding ac power
73
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
network.
25. Tracking generator : output impedance <600 ohms, frequency range from 10 Hz to at least 6 MHz, maximum
output level 0 dBm.
26. True rms ac voltmeter : input impedance >100 kilohms, frequency range from 10 Hz to at least 4 kHz, averaging
times of 0.1 s and 3.0 s, input sensitivity of 0.7 mV or better, peak indicating optional, accuracy +3%.
27. True rms ac voltmeter : input impedance >100 kilohms, frequency range from 1 kHz to at least 1 MHz, input
sensitivity of 35 mV or better ( referenced to 135 ohms ), peak voltage and rms voltage indicating, accuracy +3%.
28. True rms current meter : range 0 mA to 500 mA, accuracy +3% fsc, measures dc and rms current simultaneously
( e.g., a thermocouple type meter without dc blocking condenser at the input ).
29. Voltage source : output 120 V rms at 60 Hz, output current 10 mA.
30. Voltage source : output 300 V rms at 60 Hz, output current 10 mA.
31. White noise generator : output impedance 600 ohms, frequency range from 200 Hz to at least 4 kHz, maximum
output level of at least 10 dBm.
32. Zero level encoder/decoder : Equipment or companion terminal equipment capable of encoding and decoding
analog signals with zero loss in the bit format appropriate for the digital interface under test.
33. Feeding Bridge with 2μF±10% blocking capacitors and inductors of 2 Henries minimum for analog telephone.
34. Test loops : Any real loop or commercially available artificial loop equivalent to 0 km and 5 km 0.4mm #26 AWG
non-loaded cable.
35. Artificial ear : The artificial ear shall be the IEC coupler for supra-aural earphones as described in ANSI
S3.7-1973, Method for Coupler Calibration of Earphones. The pressure response of the microphone shall be used
in determining the sound pressure generated in the coupler by the receiver.
36. Standard microphone : A type ( 0.5 in ) laboratory standard pressure microphone according to ANSI S1.12-1967[3]
for measuring the sound pressure generated in the artificial ear. The sensitivity of the microphone should be
constant over the frequency range of 100 Hz to 5000 Hz.
37. Microphone amplifier : The frequency response characteristics of this amplifier should be constant over the
frequency range from 100 Hz to 5000 Hz. The input-output characteristics of this amplifier must be linear for the
range of sound pressure levels to be measured.
38. 100 Hz to 5000 Hz sine-wave frequency generator, with a sweep speed slow enough not to reduce the accuracy of
the measurement. The generator level should be constant over a frequency range of 100 Hz to 5000 Hz.
39. AC Voltmeter having ranges from 0.01V to 10V (full scale reading ), with an input impedance greater than 100 k
ohm for bridging measurements or equal to 900 ohm for terminated measurements.
40. Simulative transmission wire is # 26AWG 5km(0.4mm, 280Ω/km, 50nf/km)
74
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
Loop Simulator (Feeding Bridge):
Tip
C=2μF±10%
L≧2H, DCR=200Ω±10%
*VR: 3kΩ, 8Wvariable Resistor
48Vdc
C=2μF±10%
L≧2H, DCR=200Ω±10%
Ring
Reference loading impedance: 600Ω
600Ω
75
PSTN01
November 17,2003
Revise July 20,2007
Telecom Technical
Specifications
Simulative transmission wire:
1. 0.4mm #26AWG transmission wire : 0 KM simulative circuit
R
R
C
R
R
R : 70Ω
C : 50nF
2. 0.4mm #26AWG transmission wire : 2 KM simulative circuit (2 pieces of 1 Km simulative circuit be serial)
R
R
R
R
C
R
C
R
R
R
R : 70Ω
C : 50nF
3. 0.4mm #26AWG transmission wire : 5 KM simulative circuit (5 pieces of 1 Km simulative circuit be serial)
R
R
R
R
C
R
R
R
R
C
R
R
R
R
C
R
R
R : 70Ω
C : 50nF
76
R
R
C
R
R
C
R
R