ETA / ITA user guide 1

ETA / ITA user guide 2

Publication Notice
This manual has been compiled and checked for accuracy. However, the information contained in this manual does not constitute a warranty of performance and is not part of a contract or licence except as may be expressly agreed. The products to which this manual refer are subject to continuous development and we reserve the right to revise them and this publication from time to time without notice, assume no liability for losses incurred as a result of out-of-date or incorrect information contained in this manual and acknowledge that some names referred to are registered trademarks.
Proprietary Notice
This document is copyrighted. All rights are reserved. This document may not in whole or in part be copied, photocopied, reproduced, translated, or reduced to any electronic medium or machine-readable form without written permission.

2003. All rights reserved.
 Trademarks
Windows

is a registered trademark of Microsoft Corp.
All other trademarks are the property of their respective holders
ETA / ITA user guide 3

3.1
Installing the Desktop TA .................................................. 11
3.2
Installing PC card TAs ....................................................... 11
3.3
ETA Front Panel ................................................................. 12
3.4
ETA Rear Panel .................................................................. 12
3.5
ITA-ISA card (Pre Feb 2000) .............................................. 13
3.6
ITA-ISA card (Post Feb 2000) ............................................ 14
3.7
ITA-PCI card ....................................................................... 15
5.1 Configuring MSN or Subaddressing ...................................... 20
6.1
AT Commands .................................................................... 21
6.2
Configuration displays ...................................................... 22
ETA / ITA user guide 5

7.1 Configuration display .............................................................. 23
7.2 Actions ...................................................................................... 23
7.3 General Configuration ............................................................. 24
7.4 AT Command responses ......................................................... 25
7.5 ISDN Configuration .................................................................. 26
7.6 Serial Interface commands ..................................................... 27
ETA / ITA user guide 6

This manual covers the ETA (External desktop model) and ITA (Internal PC card)
ISDN Terminal Adapters.
ETA and ITA Terminal Adapters are “Active” devices; they contain a powerful microprocessor that offloads communications tasks from the computer allowing applications to perform at their best whilst you are online.
While the majority of ISDN Terminal adapters interface a single computer to the
ISDN network, ETA/ITA are dual port devices for connection to two computers.
ETA and ITA are ideal for applications where two or more concurrent data connections are needed such as the small office, a power user requiring high speed Multilink ISDN connections or dial-in servers supporting two concurrent callers.
The Terminal Adapters include a number of enhancements appropriate to
Electronic Point of Sale (EPoS) and are particularly suitable for retail environments.
ETA, the desktop model interfaces two standard telephone/ fax machines to
ISDN services in addition to its data connections. This feature eliminates the need to separately purchase ISDN telephones in addition to the data adapter.
ETA / ITA user guide 7

In addition to this User Guide the packaging should contain the following:
ISDN adapter
ISDN Cable
Windows 95/98/NT4/2000 Software Disk
The desktop model includes:
1 or 2 Serial adapter cables (single or dual channel units)
1 or 2 Serial adapter connectors (9 pin to 25 pin)
2 Telephone adapter cables (units with POTS)
Mains transformer
The latest software drivers, updates and user manuals are available online from the Internet at: www.panicsystems.co.uk
ETA / ITA user guide 9

a. Connect the ISDN line cord to the Terminal Adapter, and the other end to the ISDN wall socket (the Network Terminating Unit or NTU). b. Connect a data cable from DTE port 1 of the Terminal Adapter to a serial port on the Personal Computer. c. Optional: The second DTE port of the TA may be connected to a second serial port on the PC to enable the system for two concurrent connections or multilink operation. d. Optional: connect to one or both TEL ports to telephone, fax machine, or other compatible equipment. e. Connect the power adapter to the power connector on the Terminal
Adapter
a. ISA Versions - Configure the switches and links on the card to use different COM port and Interrupt resources to any existing serial device fitted to the PC. See section 3.5 for configuration options.
PCI version – See section 3.7 for software installation. b. Disconnect the PC from its mains power supply and fit the card internally. Refit the protective cover to the PC. c. Connect the data cable from the Terminal Adapter to the ISDN wall socket (the Network Terminating Unit or NTU).
The TA is now ready to be switched on and configured for use
ETA / ITA user guide 11

Indicator pwr txd rxd dtr dcd isdn ok
Function
Power on
Transmit Data Indicator
Receive Data Indicator
Data Terminal Ready Indicator
Data Carrier Detect Indicator
ISDN Circuit live Indicator
Connector
ISDN
DTE 1
DTE 2 (opt.)
TEL 1
TEL 2
Pwr
I / O
Function
Socket for ISDN cable to network
RS232 Data Connection #1
RS232 Data Connection #2
Connection for tone dial handset, modem or fax machine #1.
Connection for tone dial handset, modem or fax machine #2.
Low voltage power socket.
Power switch
ETA / ITA user guide 12

The ITA card has 2 DTE ports, which must be mapped to COM ports on the PC.
ITA cards manufactured prior to February 2000 are of a dual card construction.
Default settings:
DTE1 = COM1 DTE2 = COM2
DTE port selection
5,6
The settings of switch SW2 and the IRQ (Interrupt) jumpers can be adjusted as follows to change the default DTE port assignments:
Purpose SW2 #
1,2 Unused - set to OFF
3,4 DTE Port 2 COM port number
COM1
SW3
OFF
COM2 (Default) OFF
COM3
COM4
ON
ON
SW4
OFF
ON
OFF
ON
Suggested IRQ
4
3
4
3
DTE Port 1 COM port number
SW5
COM1 (Default) OFF
COM2 OFF
COM3
COM4
ON
ON
SW6
OFF
ON
OFF
ON
Suggested IRQ
4
3
4
3
ETA / ITA user guide 13

The ITA card has 2 DTE ports, which must be mapped to COM ports on the PC.
Default settings:
DTE1 = COM1
DTE port selection
DTE2 = COM2
5,6
The settings of switch SW2 and the IRQ (Interrupt) jumpers can be adjusted as follows to change the default DTE port assignments:
Purpose SW102 #
1,4 Unused - set to OFF
2,3 DTE Port 1 COM port number
COM1
SW2
OFF
COM2 (Default) OFF
COM3
COM4
ON
ON
SW3
OFF
ON
OFF
ON
Suggested IRQ
4
3
4
3
DTE Port 2 COM port number
SW5
COM1 (Default) OFF
COM2 OFF
COM3
COM4
ON
ON
SW6
OFF
ON
OFF
ON
Suggested IRQ
4
3
4
3
ETA / ITA user guide 14

The ITA-PCI card is a Plug-and-Play device and does not require any hardware configuration settings.
The software installation procedure requires two steps:
1. Follow the instructions below for your operating system to install the PCI serial drivers.
2. Turn to Chapter 4 to install the ISDN Adapter. During this stage, select the serial ports installed in step 1 when prompted.
Windows 95/98
1. The system will detect the card and start the “add new hardware” Wizard.
2. The system will suggest that it searches for the best driver for the device. Click next to confirm.
3. Insert the driver disk now.
4. Click next to continue
5. Once the system has found the driver, click next to continue.
6. The system installs the driver
7. Click finish
Windows 2000
1. The system will detect the device and ask which driver to install. Click next
2. Select “Search for a suitable driver for my device” and click Next
3. Insert the driver disk now
4. The system will copy files and install the driver. Click finish.
Windows NT4
1. Run “Install serial” from the driver disk.
2. When the install application starts click Next to continue
3. Ensure “Install” is selected then click Next.
4. CLICK OK to accept the license agreement
5. The system will install the driver and prompt for a restart. The port is available after the restart.
ETA / ITA user guide 15

The following procedure installs the ISDN adapter in Windows 9x, 2000 and NTx.
Once installed the ISDN adapter can be used with most Windows applications including Dial-Up Networking, Hyperterminal, MS Exchange and Outlook mail.
Click on the Modems icon in Control panel..
Click on Add...
If the PC has PCMCIA slots, the following dialog appears.
Select Other and click on Next..
ETA / ITA user guide 17

Click on Next
When installing for the f irst time, click on “Have Disk”, and insert the driver diskette into the PC. The files are also available at www.panicsystems.co.uk
A number of ISDN adapter profiles are listed, select the one that suits your application. For a remote access server or calling the Internet, the PPP profile will normally be suitable.
Click on next.
The next dialogue prompts for the serial port, highlight the appropriate one(s) and click on Next.
To use both channels of the TA under Windows, repeat the steps in this section a second time.
If both channels of the ISDN adapter are installed they can be used independently by different applications, or by Dial-Up Networking for a Multilink connection.
The TA is now installed and ready for use.
ETA / ITA user guide 18

The TA can be configured to connect specified incoming calls to particular
Telephone or Data ports, based on information received from the network when the call is received.
Depending on the type of ISDN line and the subscribed options, the network may provide: an MSN number (the number dialed by the caller), a Subaddress
(specified by some calling equipment), or request a particular B channel (based on the number dialed by the caller).
The TA is most commonly set to use “MSN” to associate the number dialed with a port, however any one of the alternatives below may be specified.
First call to channel 1 (Default setting)
Configure the TA with AT!L0
The TA connects the first incoming call to DTE1(data call) or TEL1 (voice call).
When a second concurrent call is received, it is connected to DTE2 or TEL2.
Selected B Channel
Configure the TA with AT!L1
Use this setting for older BT ISDN lines that are neither Euro-ISDN compliant nor subscribed to MSN. For pre-1998 lines with two numbers, BT does not provide an MSN number but allocates a B channel to each number.
Incoming calls on the first number connect to either DTE1 (data call) or TEL1.
Incoming calls on the second number connect to either DTE2 (data call) or TEL2.
MSN number
Configure the TA with AT!L2 and see section 5.1 to allocate numbers to ports.
The number dialed by the caller determines which port receives the call.
This is the most common configuration if the ISDN line is Euro-ISDN, or is subscribed to MSN (Multiple Subscriber Numbers).
Subaddress
Configure the TA with AT!L3 and see section 5.1 to allocate Subaddresses to ports.
The Subaddress specified by the calling device determines which port receives the call. Note that Subaddressing is a subscriber option.
ETA / ITA user guide 19

In MSN or Subaddress mode (AT!L2,3 or 4), the TAs uses the incoming call table to allocate calls to DTE or TEL ports. The table is displayed by entering AT*C1.
AT*C1
ENTRY
7
8
9
4
5
6
0
1
2
3
OK
MSN-No
8510
8511
8512
8513
8514
8515
8516
0000
0000
0000
ACTION
1 (Ring DTE 1)
3 (Ring DTE 2)
2 (Ring TEL 1)
4 (Ring TEL 2)
0 (Ignore call)
0 (Ignore Call)
5 (Beep)
0 (Ignore Call)
0 (Ignore Call)
0 (Ignore Call)
ENTRY
MSN-No
Number to identify the configuration setting
The telephone number or Subaddress. This entry should be the last digits (up to 4) of the phone number (or Subaddress)
ACTION The DTE or telephone port to receive the call
(or the TA can signal the call with a simple “beep”)
The following commands add or modify an entry to the table:
AT !M<ENTRY> : <MSN/SUBADDRESS-No>
AT!N<ENTRY> : <ACTION#> eg.
AT !M7:8517 !N7:2 Entry 7 - When the caller dials 8517 ring TEL 1.
(or when the Subaddress is 8517 ring TEL1)
ACTION ACTION#
Ignore call
Ring DTE port 1
Ring TEL port 1
0
1
2
Ring DTE port 2
Ring TEL port 2
Signal a beep on speaker
3
4
5
Once the new settings are saved with the command AT&W they are permanent unless overwritten or the TA is reset to factory settings.
ETA / ITA user guide 20

Like a modem, the Terminal Adapter is configured and controlled with
AT commands .
To send AT commands to the Terminal Adapter, run a terminal program such as Hyperterminal on a PC.
First, select the appropriate COM port.
Now select the baud rate to be 9600, 19200, 57600, or 115200.
Enter an AT command:
Type “AT”, then Enter.
The response “OK” should appear on the next line of the screen.
Chapter 7 lists the full set of AT commands.
ETA / ITA user guide 21

Type AT*C to display an overview of the TA
’s current configuration.
The screen displays a report similar to the sample below:
STATUS
DTR No(ND)=
SUB No(NT)=
SUB No(NM)=
X25 No(NA)=
X25 No(NI)=
...............OFFLINE
PHO No(NP)=
CLI1No(NY)=
CLI2No(NZ)=
!L ISDNLINE SINGLE-0,DUAL-1,MSN-2 00
(AT*C1 Incoming call config)
ISDN L1 STATE NUMBER ...........00007
ISDN L2 STATE NUMBER …........00007
ISDN L3 STATE NUMBER (Ba-Ch).1:00000
ISDN L3 STATE NUMBER (Bb-Ch).0:00000
!A DTE1 BAUD RATE .............115200
!B DTE1 FORMAT ................8 NONE
!C DTE1 STOP ...................1 BIT
`D DTE1 AUTOBAUD .............ENABLED
E CMD ECHO .......................ON
F AUDIO CALL ............TO TEL PORT
G *PROTOCOL .............V120 64K(C1)
SPEAKER ........................ON
V AT CMD RESPONSES ..........VERBOSE
X1 SUBADDRESS MESSAGES ...........OFF
X2 DTE BPS MESSAGE ...............OFF
X4 BUSY/NO-DIALTONE MESSAGE .......ON
X8 CAUSE MESSAGE .................OFF
X16 D.I.E. MESSAGE ...............OFF
X32 M.S.N. MESSAGE ...............OFF
X64 C.L.I. MESSAGE ...............OFF
X128 EXTENDED MESSAGES ...........OFF
X256 ABORT MESSAGE ................OK
&C DCD OPT ......V14/42/V120 CTRL DCD
&D DTR OPT ......DTR ABORT(IGNORE :D)
&M DTE INTERFACE........ASYNCHRONOUS
&S DSR OPT .................FORCED ON
&T TEST OPT .....................NONE
\G REMOTE FLOW ...................OFF
\N PROTOCOL ..................EC AUTO
\Q LOCAL FLOW .........RTS/CTS ONLINE
\X PASS XON\XOFF ..................ON
:D DTR OPT ......................NONE
Type AT*C1 to display the TA
’s incoming call settings:
AT*C1
ENTRY
0
1
2
3
4
5
6
7
8
9
OK
MSN-No
8510
8511
8512
8513
8514
8515
8516
0000
0000
0000
ACTION
1 (Ring DTE 1)
3 (Ring DTE 2)
2 (Ring TEL 1)
4 (Ring TEL 2)
0 (Ignore call)
0 (Ignore Call)
5 (Beep)
0 (Ignore Call)
0 (Ignore Call)
0 (Ignore Call)
ETA / ITA user guide 22

Command
*C
Function Parameter
Display configuration summary
I
*C1 Incoming calls configuration summary
Display Product Version 0
9
Sn=? Display S Register n
D
A Answer Incoming Call.
Dial Command
Notes
Product ID
Software version
<number>
L
Dial number
Redial last number
N Dial Stored Number
:N<nui>-<nua> Dial X.25 host and establish virtual circuit using supplied NUA and
NUI
H Hang Up
ETA / ITA user guide 23

Command Function Parameter
Sn=
&F
Set S Register n
Load Factory settings
Notes
ND= DTR autodial
NP= Telephone autodial
<number>
<number>
NT= TEL Subaddress number <number>
NM= DTE Subaddress number <number>
NY= DTE CLI number
NZ= TEL CLI number
<number>
<number>
!Q
&W
Z
Telephone ring cadence 0 or 1
Save configuration
Soft reset
Not affected are:
!L ISDN line type
*C1 Incoming call settings
Nx= Stored numbers
Number to automatically dial when handset is lifted
Subaddress for outgoing telephone calls
Subaddress for outgoing data calls
Data calls accepted only from this number if entered
Voice calls accepted only from this number if entered.
0 - PABX ring
1 - BT ring
Save configuration profile
Load stored profile
ETA / ITA user guide 24

Command Function Parameter Notes
E Echo AT Commands 0
1
OK
CONNECT
Echo off
Echo on
V AT Responses 0
1
Numeric ( OK = 0 )
Verbose ( OK = OK )
The following table shows the numeric equivalent to verbose responses.
Verbose Numeric
0
1
RING 2
NO CARRIER 3
ERROR 4
NO DIALTONE 6
BUSY
ABORTED
7
9
X Extended call information
1
2
4
Subaddress messages
Report DTE speed after
CONNECT
Enable BUSY /NO
8
16
32
64
DIALTONE messages.
Call fail message from exchange
D.I.E (Exchange message)
M.S.N. (Dialed number)
C.L.I. (Callers number)
128
256
Extended messages.
Dial abort message is
“NO CARRIER” (default message is “OK”)
Note that ATX settings are added to give the required set of options.
Eg. ATX511 – Enable all call information
The command ATX+n or ATX-n adds or subtracts n from the current setting.
ETA / ITA user guide 25

Command Function Parameter Notes
!L Allocation of ports to calls 0
1
!J,!K Default DTE port receiving incoming calls.
G ISDN protocol 1
2
2
3
4
3
4
10
\N Link protocol 0
First call to DTE1(TEL1)
Second call to DTE2
B Channel 1 = DTE1
B Channel 2 = DTE2
MSN
Subaddress
MSN OR Subaddress
AT!J1 !K2 DTE1 (default)
AT!J2 !K1 calls to DTE 2
V.110 4.8Kbps
V.110 9.6Kbps
V.110 19.2Kbps
V.110 38.4Kbps
Use protocol set with AT\N
2
V.120 non-Error Corrected connection.
V.120 Error Corrected connection.
3
4
5
6
Automatically detect
V.120 EC or non-EC
PPP
X.25 TPAD
Note 1. V.120 modes automatically fallback to V.110 if an incoming V.110 call is detected.
X.25/X.28 (B channel)
X.31 (D Channel)
Note 2. S-Register 126 configures B or D channel operation when \N6 is selected.
ETA / ITA user guide 26

&D
&S
\Q
!A
!C
!D
!B
Command Function Parameter
DTE port baud rate
DTE port format
DTE port stop bits
DTE port auto detect
1200* / 9600 / 19200 / 57600 / 115200
* DTE port 2 only
0
1
2
1
Notes
8 data bits no parity
7 data bits even parity
7 data bits odd parity
1 stop bit
0
1
Auto detect enabled
Fixed baud rate/parity as set with !A, !B and !C commands
&C Data Carrier Detect 0
1
DCD always on
DCD on when online
Data Terminal Ready
Data Set Ready
Interface Flow Control
0
2
0
1
Ignore DTR. Assume on
DTR hangup
DSR always on
DSR on when online
0
1
2
3
4
No flow control
XON/XOFF
RTS/CTS
CTS and XON/XOFF
RTS/CTS online, no flow control offline.
ETA / ITA user guide 27

Command Function Parameter
\G Remote Flow Control 0
2
\X Pass XON/XOFF 0
1
Notes
Off
Send XOFF char to remote unit when link buffers fill.
XON/XOFF characters received from the DTE are not forwarded to remote.
Forward XON/XOFF
ETA / ITA user guide 28

Symptom Corrective action
Unable to make a data call 1. Follow the procedure below for no dialtone.
2. Use a terminal to attempt a connection.
The command ATX511 turns on call progress messages that may indicate the reason for call failure.
Unable to make telephone calls and there is no dialtone
1. Check the ISDN OK LED is on.
This indicator is on when the TA is attached to an ISDN line supplying power.
(Note however if you connect via a switchboard, it may not supply power.)
2. Ensure no other devices are using the
ISDN line. Temporarily disconnect other devices and try again.
3. Using an attached terminal, type AT*C.
ISDN L1 and L2 state numbers should both be 7, indicating the ISDN line is activated. If not there is a network or cabling problem.
Phone does not ring when called Connect a terminal to the TA.
Type AT*C1 and check the incoming call configuration.
ETA / ITA user guide 29

#
42
50
52
30
39
40
4
5
7
12
25
2
3
0
1
Range Default
0-255
0-255
0-127
0-127
0-127
0-127
0-255
0-255
0-255
0-255
0-255
0-255
0-1
0-255
0-255
03
00
2B h
0D h
0A h
08
60
100
00
0
11 h
13 h
1
3
3
ETA / ITA user guide
^J
^H
60s
1s
+
^M
^Q
^S
0s
0s
Description
Rings to answer
Detected rings count (read only)
Command mode escape character
Carriage Return Character
Line Feed Character
Delete character
Seconds wait for carrier before
"NO CARRIER / NO ANSWER"
Command mode escape guard timer
Seconds before hang up after DTR lost
Data inactivity disconnect timer.
10 second units.
XON Character
XOFF Character
Any character aborts dialing.
1=Enable
0=Disable
Command mode escape sequence character count
Remote access escape sequence character count
31

# Range Default
122
120
121
53
74
76
0-255
1-512
1-7
2A h
255
3
80-98 even
0-9999 0
81-99 odd
0-5 0
105
0-1
0-1
0-1
124 0-1
125 0-1
126 0-1
127 0-63
0
0
0
0
1
0
255
*
ETA / ITA user guide
Description
Remote access sequence character
V.120/X.25 maximum transmit packet size
V.120/X.25 Transmit window size
Calling numbers
(10 S-Registers)
Device (10 S-registers)
Call clearing code (see chapter 8)
Data call bumping
0
– Disabled
1 – Enabled:
TEL1 off hook = hang up DTE1
TEL2 off hook = hang up DTE2
Telephone call bumping
0=Terminate active telephone call and disable telephone.
1=Enable telephone
Busy options when port in use
0 - Ignore incoming calls
1 - Reject incoming calls
X25 More bit support for TPAD
1=Enable
0 = X.25 modulo 8 (D-Channel)
1 = Extended X.25 modulo 128
X.25 B or D Channel mode
0 = B channel connection
1 = D channel connection (SAPI 16)
Fixed TEI value for X.31 SAPI16
32

# Range Default Description
145
148
130
131
143
144
0-1
0-15
0-255
0-255
0-255
0
29
30
100
2.9s
3s
10s
Enable Least Cost Call Routing
(Optional feature)
(LCCR) Carrier selected for last call
V120/X25 SABM timer precount
V120/X25 SABM resend timer
V120 EC detection phase timeout
100ms units.
255 / 128 255 TEI allocation (DTE1 command)
255 = Automatic (Multipoint ISDN)
128 = TEI 0 (Point to Point)
149
S-registers 201-206 relate to X.25 operation only and correspond to X.3 PAD parameters. These settings may be configured at the PAD prompt (‘  ’) using the command “SET <X3 parameter #>:<value>”. Eg SET 2:1 turn on command echo.
201
202
203
204
0-1
1
0
0 - 255
0
– 1
– 255
0
1
0
16
0
^P
ETX
ISDN-D Channel diagnostic. DTE 1 only
0 = Off
1 = On.
PAD recall character
PAD Echo. 1=On
X25 Data forwarding character.
0 – None (send full packets)
2
– Carriage Return (ODH)
16 – End of Text (03H)
X25 Idle Timer delay
206 0 - 5 5 X.28 messages
0 - suppressed
5 - enabled
ETA / ITA user guide 33

226
231
232
224
225
#
220
221
223
Range Default
0 – 1
0
– 1
0
0
0 – 2 0
0 – 1
0 – 255 0
0
– 255
4
0
1-7
6-9
3
7 128
Description
Drop TEL call to allow outgoing DTE data call.
0 – Disable
1
– Enable
TEL port enable
0 – Enable
1 - Disable
X.25 L2 restart role (B/D channel)
0
– Answer (Wait for SABM, CR=0 )
1 – Originate (Send SABM, CR=1 )
2
– Answer (Wait for SABM, CR=1 )
3 – Orig. (Send SABM, CR=0 )
X.25 L3 restart role (B or D channel)
0
– Passive (Wait for Restart)
1 – Active (Send Restart)
X.25 LCN
(Logical Channel Number)
X.25 LGN
(Logical Group Number)
X.25 Frame window size
X.25 Frame size
6=64, 7=128, 8=256, 9=512 octets
ETA / ITA user guide 34

ISDN Network Compliance
Basic rate 2B+D
Q.931 and Q.932
ISDN Protocols
X.25 / X.28
X.31
X.75
V120
V110
Packet protocol
Packet protocol on ISDN D channel
Packet protocol
PPP
V14
Synchronous 64Kbps synchronous data (DTE 2 only)
Voice channels PCM A-Law encoding
EPoS protocol TPAD
Error Corrected and non-Error Corrected modes
2.4Kbps - 56Kbps Synchronous or Asynchronous
Asynchronous to Synchronous PPP conversion
Clear 64Kbps channel, asynchronous data
User ports
DTE Serial
TEL
2 RS232 serial ports supporting baud rates to
115200bps
2 * Telephone interfaces supporting ring generation, call progress tones and DTMF dialing (ETA only)
Configuration
AT Command set.
X.28 command set (X.25 PAD mode).
ETA / ITA user guide 35

Applicable to ETA units only
Line sense option
Units fitted with the line sense option incorporate circuitry to detect the ISDN line being disconnected.
The sense output is a normally closed relay contact suitable for connection to alarm panels. The relay is open if the ETA is turned off or the ISDN line is disconnected. The ISDN OK indicator on the front panel provides a visual confirmation of the relay status.
The relay output is connected to pins 1 and 6 (the outer pins) of the TEL1 socket.
Operation of TEL1 is unaffected although a suitable adapter will be needed if a connection to TEL1 is required.
DC power
Units may be supplied from either the supplied mains transformer or from a DC source such as a battery.
ETA accepts from 12 to 18VDC, which is applied to the two-pin power connector on the rear of the unit.
ETA is not sensitive to DC supply polarity and 0v and +Ve may be connected in either orientation.
ETA / ITA user guide 37

CE 168 X
The Desktop Basic Rate Adapter carries approval marking, as shown above, in accordance with the CE Marking Directive and may be found on the rear panel.
The adapters have been tested and found compliant to the following European
Directives:
91/263/EEC (Telecommunications Terminal Equipment)
73/23/EEC (Low Voltage Directive) as amended by 93/68/EEC
89/3336/EEC (Electromagnetic Compatibility)
BABT the UK notified body has issued Pan-European approval to the Desktop
ISDN Terminal Adapter in accordance with the TTE directive (91/263/EEC). This approval is valid throughout the European Economic Area.
ETA / ITA user guide 39