Installation and Operation Manual
VC-6A
6-Channel PCM/ADPCM
Voice Module
MEGAPLEX-2100 MODULE
VC-6A
6-Channel PCM/ADPCM Voice Module
Installation and Operation Manual
Notice
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RAD Data Communications Ltd.
North America Headquarters
RAD Data Communications Inc.
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© 1988–2006 RAD Data Communications Ltd.
Publication No. 764-234-02/06
Quick Start Guide
If you are familiar with the product, use this guide to prepare it for operation.
1.
Installing the Module
To install a VC-6A/E&M module, perform the following steps:
1. Set the signaling mode switches SW1-SW3 to the required signaling mode (use
the table below and the figure on the next page as a guide).
Signaling Mode
Switch SW1
Switch SW2
Switch SW3
RS-464 Type I
ON
ON
ON
RS-464 Type II
ON
OFF
ON
RS-464 Type III
ON
ON
ON
RS-464 Type V
OFF
OFF
OFF
BT SSDC5
OFF
OFF
OFF
2. For VC-6A/E&M with 4-wire only, set the module channels’ amplification
jumpers S1 to S7 as required (use the table below and the figure on the next
page as a guide).
Jumper No.
State
Amplification
S1, S2, S3, S4, S5, S6, S7
ON
OFF
+8 dBm
+2 dBm
3. Insert the module in the assigned I/O slot of the Megaplex enclosure.
4. Configure the module as detailed below in the configuration procedure.
To install an FXS or FXO module, perform the following steps:
1. Insert the module in the assigned I/O slot of the Megaplex enclosure.
2. Configure the module as detailed below in the configuration procedure.
Installing the Module
1
VC-6A Installation and Operation Manual
Quick Start Guide
S1
ADPCM
Sub-board
ON
SW3
SW2
(not installed on
P option modules)
SW1
F4
F5
S2
S3
OFF
F6
F7
S4
F8
F9
RX Amplification
S5
S1, S2, S3, S4,
S5, S6, S7
S6
OFF
F10
F11
Default
S1, S2, S3, S4,
S5, S6, S7
F12
F13
ON
4-Wire
only
F14
F15
S7
2.
Configuring the Module
Start VC-6A configuration by entering the command: DEF CH A:*<Enter>. The
configuration parameters and the allowed range of values are listed below.
General Parameters
Parameter
Range of
Values
Wires Num
Coding
Signaling
2 WIRES (all)
a LAW
CAS (E1 only)
4 WIRES (E&M only)
u LAW
RBMF SIGNALING (T1 only)
ROBBED BIT FRAME
NO SIGNALING
Profile
1
2
3R
3M
3RM
4
Parameter
Range of
Values
OOS Signal
ML Slot
ML Channel
IDLE BUSY
IO-1 to IO-12
EX1
PCM
EX2
ADPCM
BUSY IDLE
Encoding
FORCED IDLE
FORCED BUSY
Parameter
Range of
Values
Interface
Metering
LOOP START
12kHz
GROUND START
16kHz
Channel Parameters
Parameter
Range of
Values
Connect
Transmit Level
YES
E&M: +8 to -17 dBm
NO
FXS: +8 to -13 dBm
FXO: +7 to -18 dBm
Receive Level
E&M: 2w:+2 to -23 dBm
4w:+2 to -17 dBm (w/o ampl.)
+8 to -17 dBm (w/ ampl.)
FXS: +2 to -17 dBm
FXO: +1 to -23 dBm
2
Configuring the Module
Operation Mode
BI-DIRECTIONAL
UNIDIRECTIONAL
BROADCAST
Contents
Chapter 1. Introduction
1.1 Overview ....................................................................................................................... 1-1
Product Options ................................................................................................................... 1-2
E&M Module ........................................................................................................................ 1-2
FXS and FXO Modules ..........................................................................................................1-4
Unidirectional and Broadcast Applications ............................................................................ 1-8
1.2 Physical Description ..................................................................................................... 1-10
1.3 Functional Description ................................................................................................. 1-11
Audio Performance.............................................................................................................1-11
Timeslot Assignment ........................................................................................................... 1-12
Handling of Signaling Information .......................................................................................1-13
Configuration and Management ..........................................................................................1-17
Test and Diagnostic Capabilities .......................................................................................... 1-17
1.4 Technical Specifications ............................................................................................... 1-18
Chapter 2. Installation and Setup
2.1
2.2
2.3
2.4
Introduction................................................................................................................. 2-1
Setting Internal Jumpers and Switches.......................................................................... 2-1
Inserting the Module into Enclosure ............................................................................. 2-3
Connecting the Cables................................................................................................. 2-3
Connecting the Voice Channels ............................................................................................2-3
Connecting the External -48 VDC Voltage .............................................................................2-3
2.5 Normal Indications ...................................................................................................... 2-4
Chapter 3. Configuring the Module
3.1 Overview..................................................................................................................... 3-1
3.2 Configuration Parameters............................................................................................. 3-1
Module Parameters............................................................................................................... 3-1
Channel Parameters.............................................................................................................. 3-3
Chapter 4. Diagnostics and Troubleshooting
4.1 Scope............................................................................................................................. 4-1
4.2 Test and Diagnostic Functions ........................................................................................ 4-1
Local Digital Loopback (Local Loop)......................................................................................4-2
Remote Analog Loopback (Remote Loop).............................................................................. 4-2
Tone Injection ...................................................................................................................... 4-3
4.3 Troubleshooting Instructions........................................................................................... 4-4
4.4 Frequently Asked Questions ........................................................................................... 4-5
4.5 Technical Support .......................................................................................................... 4-5
VC-6A Installation and Operation Manual
i
Table of Contents
Appendix A. Connector Wiring
Appendix B. Signaling Profiles
ii
VC-6A Installation and Operation Manual
Chapter 1
Introduction
1.1 Overview
This manual describes the technical characteristics, applications, installation and
operation of the VC-6A voice interface modules.
The VC-6A modules are a family of user-programmable voice interface modules
for the modular E1/T1 multiplexer systems Megaplex-2100 and Megaplex-2104.
The modules provide six voice channels using one of two user-selectable voice
encoding modes:
Note
•
Toll-quality 64 kbps PCM voice encoding in compliance with ITU-T Rec.
G.711 and AT&T Pub. 43801
•
Toll-quality 32 kbps ADPCM voice compression encoding in compliance with
ITU-T Rec. G.732 and G.723 (1988), ANSI T1.303-1989.
VC-6A modules ordered with P option support only PCM encoding, therefore ignore
all information in this manual relating to ADPCM encoding if you are using such a
module.
All VC-6A modules offer flexible configuration of the signaling format.
The VC-6A modules maximize the Megaplex-2100 utilization: for example, a
single Megaplex-2100 enclosure, operating in PCM encoding mode, can carry up
to 60 voice channels over two E1 links (or up to 48 channels over two T1 links). A
single compact Megaplex-2104 enclosure can carry 24 PCM voice channels over a
T1 or E1 link.
In ADPCM encoding mode, each pair of channels requires a single timeslot.
Therefore, a single E1 link using ADPCM mode can support 60 voice channels and
a single T1 link can carry up to 48 voice channels.
Overview
1-1
Chapter 1 Introduction
VC-6A Installation and Operation Manual
Product Options
The VC-6A modules are available in the following versions:
VC-6A/E&M – supports EIA RS-464 Types I, II, III and V (BT SSDC5) signaling
VC-6A/FXS and VC-6A/FXO – support loop-start and wink start signaling, with
battery polarity reversal and pulse metering
VC-6AG/FXS and VC-6AG/FXO – support loop-start and ground-start signaling.
Note
In this manual the generic term VC-6A is used when the information is applicable to
all module versions, and the term Megaplex is used when the information is
applicable to both the Megaplex-2100 and Megaplex-2104 chassis types. The
complete designation is used only for information applicable to a specific version.
E&M Module
The VC-6A/E&M module has user-selectable two-wire or four-wire analog
interface, and E&M signaling. The interface is simultaneously selected for all the
channels. All the six channels are terminated in a single 50-pin TELCO connector.
RAD offers an adapter cable, CBL-VC16, terminated in six RJ-45 male connectors
for direct connection of user's equipment.
The E&M module supports four types of E&M signaling: EIA RS-464 types I, II, III
and V (similar to British Telecom SSDC5). Figure 1-1 shows the equivalent signaling
circuits for the different signaling modes.
Note
1-2
•
EIA RS-464 Type I signaling standard is supported without any external power
supply.
•
EIA RS-464 Type II, III and V (BT SSDC5) signaling standards are supported by
means of the internal -12 VDC power supply of the chassis. The -12 VDC
voltage is suitable for most PBX systems. However, for full support of the EIA
RS-464 Type II, III and V (BT SSDC5) signaling standards, a -48 VDC signaling
voltage is required.
To connect the -48 VDC, the VC-6A/E&M must be ordered with an optional internal
connector to the chassis voltage bus. See Connecting the External -48 VDC Voltage
in Chapter 2 for the details on VDC power sources and connection methods.
Overview
VC-6A Installation and Operation Manual
Chapter 1 Introduction
E&M
Interface
PBX
Condition
-48VDC
M Lead
On-Hook
Off-Hook
M
E
GND
- 48VDC
Open
GND
E Lead
- 48VDC
A. RS-464 Type I
E&M
Interface
PBX
Condition
M Lead
SB Lead
On-Hook
Off-Hook
M/SB
E/SG
Open
- 48VDC
Open
GND
M/SB
E/SG
Open
- 48VDC
Open
GND
- 48VDC
E Lead
- 48VDC
SG Lead
B. RS-464 Type II
E&M
Interface
PBX
Condition
M Lead
SB Lead
On-Hook
Off-Hook
- 48VDC
E Lead
- 48VDC
SG Lead
C. RS-464 Type III
E&M
Interface
PBX
1.2 kΩ
- 48VDC
Condition
M Lead
E Lead
- 48VDC
On-Hook
Off-Hook
M
E
Open
GND
Open
GND
1.2 kΩ
D. RS-464 Type V, SSDC5
Figure 1-1. E&M Equivalent Signaling Circuits
Overview
1-3
VC-6A Installation and Operation Manual
Chapter 1 Introduction
VC-6A/E&M Application
Figure 1-2 shows a basic E&M tie line extension application using VC-6A/E&M
modules.
E&M
Tie Lines
E&M
Tie Lines
E1/T1
VC-6A/E&M
VC-6A/E&M
PBX
PBX
MP-2100
MP-2100
Figure 1-2. Basic Application for VC-6A/E&M Modules
In this application each VC-6A/E&M module supports six PBX E&M tie lines. The
E1/T1 link between the Megaplex systems establishes the transmission media
between the PBXs.
FXS and FXO Modules
The VC-6A/FXS, VC-6A/FXO, VC-6AG/FXS and VC-6AG/FXO modules are used to
connect regular telephone sets (and other equipment with similar interface
characteristics) to central office and PBX extension lines. The six channels of the
FXS and FXO modules are each terminated on a separate RJ-11 female connector
for direct connection of user's equipment or PBX interface.
•
The VC-6A/FXS module has two-wire analog interfaces and supports FXS
loop-start signaling, for direct connection to subscriber telephone sets. This
module also features battery polarity reversal for wink-start signaling, as well as
metering pulse generation required for direct connection to payphones.
•
The VC-6AG/FXS module has two-wire analog interfaces and supports both
FXS loop-start for direct connection to subscriber telephone sets, and groundstart signaling for connection to ground-start PBXs.
Both FXS modules require -48 VDC for subscriber feed voltage, which is
supplied via a standard internal voltage connector from the chassis voltage
distribution bus (see Connecting the External -48 VDC Voltage in Chapter 2 for
details).
Note
1-4
For subscriber feed voltage, FXS modules can operate with any VDC input between
-20 VDC to -56 VDC. This will be sufficient for supporting most applications.
However, using input less than the nominal -48 VDC will shorten the range of the
loop span. For example, -24 VDC input will only support loop spans which do not
exceed 1 km.
•
The VC-6A/FXO module has two-wire analog interfaces and supports FXO
loop-start signaling for direct connection to PBX extension lines. This module
also features battery polarity reversal for wink-start signaling, as well as
metering pulse detection required for payphone applications.
•
The VC-6AG/FXO module has two-wire analog interfaces and supports both
FXO loop-start and ground-start signaling for direct connection to
loop/ground-start PBX extension lines.
Overview
VC-6A Installation and Operation Manual
Chapter 1 Introduction
Loop-Start Application (all VC-6A modules)
In general, FXS and FXO modules are intended for operation in a link, with the
FXO module on the central office/PBX side, and the FXS module on the subscriber
side, however FXS modules can also operate in a link with E&M modules.
In a typical application (see Figure 1-3), one FXO module is used in a link with a
FXS module to provide an off-premises extension (OPX). This configuration permits
the connection of a remote telephone as an extension of a PBX. The remote
telephone then becomes a regular local PBX subscriber, which can be dialed by
other subscribers using standard procedures, and can also dial any other PBX
subscriber.
Ringer-2100R
Extension
Lines
E1/T1
VC-6A/FXO
VC-6A/FXS
PBX
MP-2100
MP-2100
Figure 1-3. OPX Application for FXO and FXS Modules
Another application, which requires only FXS modules, is the private line with
automatic ringdown (PLAR) or “hot-line” applications. In PLAR or “hot-line”
applications, telephone sets are connected to the channels of FXS modules
installed in two different Megaplex units that are connected in a link, as shown in
Figure 1-4. Each local/remote pair of telephones can then communicate via the
Megaplex link without dialing: when one telephone goes off-hook, the other
telephone rings.
Ringer-2100R
Ringer-2100R
E1/T1
VC-6A/FXS
VC-6A/FXS
MP-2100
MP-2100
Figure 1-4. PLAR Application for FXS Modules
Due to flexible signaling configuration capabilities, the FXS and FXO
modules can also be used in links ending in the public switched telephone
network (PSTN), such as the typical application shown in Figure 1-5. In this
application, PSTN subscribers can dial directly to the subscribers connected
to the FXS module installed in the Megaplex unit.
Overview
1-5
VC-6A Installation and Operation Manual
Chapter 1 Introduction
Extension
Lines
VC-6A/FXO
E1/T1
Trunk Line
Public Switched
Telephone Network
(PSTN)
PBX
Subscribers
MP-2100
Figure 1-5. PSTN Application for FXO Modules
Wink-Start Application (VC-6A/FXS and VC-6A/FXO only)
VC-6A/FXS and VC-6A/FXO supports battery voltage polarity reversal for wink-start
signaling, which is used in direct inward dialing (DID) applications. These modules
can be used for trunk extension between Central Office switching equipment that
use wink-start signaling, and remote PBXs (see Figure 1-6).
In such an application, the VC-6A/FXS and VC-6A/FXO modules operate in a link,
with the VC-6A/FXS module on the Central Office switching equipment side, and
the VC-6A/FXO module on the remote PBX side.
Central Office
E1/T1
VC-6A/FXS
VC-6A/FXO
Switching Equipment
using wink-start
MP-2100
MP-2100
PBX
using wink-start
Figure 1-6. Wink-Start Trunk Extension for DID Application using VC-6A/FXO and VC-6A/FXS Modules
Note
Battery voltage polarity reversal is not supported when using ADPCM compression
mode by systems with E1 links.
Payphone Application (VC-6A/FXS and VC-6A/FXO only)
The VC-6A/FXS module provides 12/16 kHz metering pulse generation for direct
connection to public payphones, while the VC-6A/FXO module provides 12/16
kHz metering pulse detection. In a typical application (see Figure 1-7), a
VC-6A/FXO module is used in a link with a VC-6A/FXS module to provide an
off-premises extension (OPX) of public payphones. This configuration permits the
connection of a remote payphone telephone as an extension of a PBX. The remote
payphone then becomes a regular local PBX subscriber, which can be dialed by
other subscribers using standard procedures, and can also dial any other PBX
subscriber, while transferring the metering signaling for billing purposes.
1-6
Overview
VC-6A Installation and Operation Manual
Chapter 1 Introduction
Ringer-2100R
FXO
FXS
E1/T1
VC-6A/FXO
PBX
using pulse metering
VC-6A/FXS
Public
Payphones
MP-2100
MP-2100
Figure 1-7. Payphone Application using VC-6A/FXO and VC-6A/FXS Modules
Note
Metering pulse generation/detection is not supported when using ADPCM
compression mode by systems with E1 links.
Ground-Start Application (VC-6AG/FXS and VC-6AG/FXO only)
While loop-start signaling is the typical method used by residential telephones, the
ground-start method is commonly used between PBXs and the Central Office (CO)
switching equipment. The ground-start method is used to avoid ingoing/outgoing
call conflicts between customer voice systems which use loop-start signaling, and
the CO equipment over the use of shared trunks.
In a basic application, two VC-6AG/FXO modules can be used to connect between
trunks from ground-start PBXs (see Figure 1-8).
E1/T1
VC-6AG/FXO
PBX
using ground-start
VC-6AG/FXO
MP-2100
PBX
using ground-start
MP-2100
Figure 1-8. Ground-Start Trunk Extension Application using VC-6AG/FXO Modules
In the ground-start application shown below in Figure 1-9, the VC-6AG/FXS and
VC-6AG/FXO modules operate in a link, with a VC-6AG/FXO module on the
PBX/CO side connected to the PBX (which is connected to CO switching
equipment that uses ground-start signaling). In this application, a VC-6A/FXS
module on the subscriber side connects telephones using loop-start signaling, while
another VC-6AG/FXS module is used for connection to a PBX that is configured as
FXO, for ground-start trunk extension.
Telephones
using loop-start
Central Office
Ringer-2100R
Switching Equipment
using ground-start
E1/T1
FXO
VC-6AG/FXO
PBX
using ground-start
(configured as FXS)
FXS
MP-2100
VC-6AG/FXS
MP-2100
PBX
using ground-start
(configured as FXO)
Figure 1-9. Combined Loop-Start and Ground-Start Application, using VC-6AG/FXO and VC-6AG/FXS
Overview
1-7
VC-6A Installation and Operation Manual
Chapter 1 Introduction
Unidirectional and Broadcast Applications
In addition to the normal (bidirectional) mode of operation, the VC-6A modules
support the unidirectional and broadcasting modes. These modes can be used in
Megaplex-2100 and Megaplex-2104 units equipped with two main links,
operating in the dual-link mode.
Unidirectional Mode Applications
The unidirectional mode, supported by the E&M and FXS modules, enables a user
at a central location to send messages to users connected to remote
Megaplex-2100/Megaplex-2104 units (simplex communication), while using only
one main link timeslot.
In this mode, any message is simultaneously heard by all the unidirectional users,
but none of them can answer. This capability is achieved by separating the
handling of the receive and transmit paths in the timeslot assigned for the
unidirectional channels, as shown by the dashed lines within the Megaplex-2100
unit at location B in Figure 1-10. This figure shows a simple system configuration.
The figure shows only one Megaplex-2100 unit (location B) with a VC-6A channel
configured for the unidirectional mode and assigned a timeslot on link A, but the
number of such units is not limited.
Location A
Location C
VC-6A
(Bidirectional Mode)
VC-6A
(Bidirectional Mode)
Location B
MP-2100
MP-2100
MP-2100
VC-6A
(Unidirectional Mode)
(Receive only)
Figure 1-10. Typical Unidirectional Application for VC-6A Modules
In this application, the user at the central location (A) is connected to a VC-6A
channel configured for operation in the normal (bidirectional) mode. The timeslot
assigned to user A is routed to the desired main link, and the channels of the other
users (e.g., at location B) are configured for the unidirectional mode, and routed to
the same timeslot on the main link connected to the Megaplex-2100 at location A
(e.g., to link A).
1-8
•
In the forward path (from location A), the timeslot assigned to the VC-6A
channel configured for unidirectional operation is automatically bypassed to
the timeslot with the same number on link B, and in addition is routed to the
receive path of the unidirectional channel. Therefore, the transmit signal of
user A is relayed to the following units, and the user B hears user A.
•
In the reverse path (to location A), the timeslot is always bypassed from link B
to link A. To prevent interference from the unidirectional channel, its transmit
Overview
VC-6A Installation and Operation Manual
Chapter 1 Introduction
path is always disconnected from the main link timeslots (at location B, no
information is inserted in the timeslot bypassed from link B to link A), and user
B cannot speak with any other user.
In addition to allowing all the users attached to unidirectional channels receive its
messages, the user can also communicate in the full duplex mode with one
additional user, configured for operation in the normal mode (this is illustrated by
the user at location C).
Broadcast Mode Applications
The broadcast mode, supported by E&M and FXS modules, enables a user at a
central location to communicate in full duplex with several users connected to
remote Megaplex-2100/Megaplex-2104 units (simplex communication), while
using only one main link timeslot. As in the unidirectional mode, any message
from user A can be simultaneously heard by all the broadcast mode users, but at
any time only one of these users can be heard by user A.
The broadcast capability is achieved by separating the handling of the receive and
transmit paths in the timeslot assigned for the broadcast channels, as shown by the
dashed lines within the Megaplex-2100 units in Figure 1-11.
Location A
Location Y
VC-6A
(Bidirectional Mode)
VC-6A
(Bidirectional Mode)
Location B
Location X
MP-2100
MP-2100
MP-2100
MP-2100
VC-6A
(Broadcast
Mode)
VC-6A
(Broadcast
Mode)
Figure 1-11. Typical Bi-directional Application for VC-6A/E&M Modules
Figure 1-11 shows a basic system configuration. The figure shows only two
Megaplex-2100 units (locations B and X), each with a VC-6A channel configured
for the broadcast mode and assigned a timeslot on link A, but the number of such
units is not limited.
Overview
1-9
VC-6A Installation and Operation Manual
Chapter 1 Introduction
In this application, the handling of the signals generated by user A is similar to that
for the unidirectional mode described above. The difference is that each broadcast
user can insert its signal in the receive timeslot of link A (instead of the signal
bypassed from link B): the change in routing is controlled by the M signal for
VC-6A/E&M modules, or by the off-hook/on-hook detector for VC-6A/FXS
modules:
•
When the M signal is not active (idle, or on-hook, state), the receive timeslot is
bypassed from link B to link A, and continues toward user A.
•
When the M signal is active (off-hook state), the receive timeslot of link B is
disconnected from link A, and the transmit path of the local broadcast user is
connected to link A.
Thus, user A can request any user to answer, and that user can lift the handset and
connect to user A. At any time, only one user can speak with user A (if more than
one user answers, only the user closer to location A will actually be heard).
1.2
Physical Description
The VC-6A modules, 4U in height, occupy one module slot in the Megaplex
chassis. Figure 1-12 shows typical panels of VC-6A modules. Table 1-1, Table 1-2,
and Table 1-3 detail the functions of the components located on the module
panels.
VC-6A
E&M
VC-6A
FXO
REM O.H
Indicator
(per channel)
REM
O.H
RING
RING
Indicator
(per channel)
CH-1
M Indicators
(per channel)
CH
1
2
3
M
4
5
6
REM
O.H
E
E Indicators
(per channel)
RING
REM CALL
Indicator
(per channel)
CH-2
REM
O.H
REM
O.H
RING
RING
RING
VC-6A/FXO,
VC-6AG/FXO
Figure 1-12. VC-6A Module Panels
1-10
Physical Description
LOC
O.H
CH-2
LOC
O.H
REM
CALL
LOC
O.H
REM
CALL
LOC
O.H
CH-5
CH-6
VC-6A/E&M
REM
CALL
CH-4
CH-5
REM
O.H
O.H
CH-3
Voice Channel
Connectors
(per channel)
CH-4
Voice Channel
Connector
(for all channels)
VC-6A
FXS
LOC
CH-1
REM
CALL
RING
CH-3
REM
O.H
REM
CALL
REM
CALL
LOC
O.H
CH-6
VC-6A/FXS,
VC-6AG/FXS
LOC O.H
Indicator
(per channel)
VC-6A Installation and Operation Manual
Chapter 1 Introduction
Table 1-1. VC-6A/E&M Modules, Panel Components
Item
Description
M Indicator (per channel)
Lights when the M line of the corresponding channel is off-hook (channel
in use)
E Indicator (per channel)
Lights when the E line of the corresponding channel is off-hook (channel
in use)
TELCO Connector
50-pin female TELCO connector, for connection of all voice channels
Table 1-2. VC-6A/FXO and VC-6AG/FXO Modules, Panel Components
Item
Description
REM O.H Indicator
(per channel)
Lights when the remote subscriber of the corresponding channel is
off-hook (busy)
RING Indicator
(per channel)
Lights when ringing is received on the corresponding channel
RJ-11 Connector
(per channel)
RJ-11 female connector for connection to the voice channels. Connector
pin assignments and functions are given in Appendix A.
Table 1-3. VC-6A/FXS and VC-6AG/FXS Modules, Panel Components
Item
Description
REM CALL Indicator
(per channel)
Lights when a call initiated by the remote subscriber is being handled by
the corresponding channel (channel is busy)
LOC O.H Indicator
(per channel)
Lights when the local subscriber of the corresponding channel is off-hook
(busy)
RJ-11 Connector
(per channel)
RJ-11 female connector for connection to the voice channels. Connector
pin assignments and functions are given in Appendix A.
1.3 Functional Description
Audio Performance
All the VC-6A modules provide six high-quality voice channels (the functional
difference between the various modules being in the signaling interface and
mode). The analog interface for the VC-6A/E&M version is user-selectable for
2-wire or 4-wire; for the other versions, a 2-wire interface is always used.
Voice encoding method for all module versions, is user-selectable for either
toll-quality 64 kbps PCM in compliance with ITU-T Rec. G.711 and AT&T Pub.
43801 or 32 kbps ADPCM in compliance with ITU-T Rec. G.732 and G.723
(1988), ANSI T1.303-1989.
Functional Description
1-11
Chapter 1 Introduction
Note
VC-6A Installation and Operation Manual
VC-6A modules ordered with P option support only PCM encoding, therefore ignore
all information in this manual relating to ADPCM encoding if you are using such a
module.
The user can select the companding law, µ-law or A-law, in accordance with
system requirements. To increase application flexibility, the nominal audio
transmit and receive levels of all the module versions can be adjusted over a wide
range.
Due to the high quality audio reproduction, DTMF signaling is transparently
transferred, inband. Therefore, the user can use DTMF signaling as usual, e.g., can
operate the telephone set keypad to access voice mail systems, interactive systems,
etc. In addition, the VC-6A versions are offered with several signaling interfaces,
that is, in the method used to interchange signaling between the local equipment
connected to a module channel and the channel interface, in accordance with the
applicable standards.
Timeslot Assignment
The VC-6A modules require one aggregate timeslot per voice channel in PCM
mode, or one timeslot per pair of voice channels in ADPCM mode.
This means that ten VC-6A modules can be installed in a single Megaplex-2100
enclosure, to support a maximum of 60 PCM voice channels using two E1 links. In
ADPCM mode, only one E1 link is required to support the 60 voice channels. For
a T1 system, up to 48 voice channels can be supported over two links with PCM
mode, or over a single link with ADPCM mode.
Alternatively, if a dual-link ML-2E1 or ML-2T1 module is used, 11 VC-6A modules
can be installed in the remaining slots to allow a single Megaplex-2100 enclosure
to support up to 66 ADPCM voice channels (requiring 33 timeslots total) over two
E1 or T1 links.
The maximum number of modules in a Megaplex-2104 enclosure is four,
corresponding to 24 voice channels using 24 timeslots in PCM mode. In ADPCM
mode, supporting the same quantity of channels requires only 12 timeslots. The
nominal input and output levels are individually adjustable in a wide range,
enabling easy integration in all environments.
The main link bandwidth required by a VC-6A module depends on the encoding
method, PCM or ADPCM:
With PCM encoding, the VC-6A modules require one main link timeslot, per voice
channel, and provide the data in a DS-0 (8-bits) compatible format, permitting
voice channel switching in a DACs-based cross-connect system.
With ADPCM encoding, the VC-6A module requires only one main link timeslot
for each pair of voice channels. Note that consecutive channels (e.g. CH 1–2, 3–4,
or 5–6) must be assigned to share the same timeslot).
The Megaplex system enables the user to select the main link that will carry the
VC-6A channels. For this purpose, the user can specify the main link module (ML
Slot) and port (ML Channel) desired.
1-12
Functional Description
VC-6A Installation and Operation Manual
Chapter 1 Introduction
Handling of Signaling Information
The VC-6A modules offer flexible configuration of signaling mode and signaling
format, down to the level of the individual bits in the channel signaling information
word.
Transfer of Signaling Information
The user can select the format of the signaling information generated by VC-6
modules in accordance with the application requirements.
The signaling information of each channel is carried by means of up to four bits
(signaling bits), designated by the applicable standards as bits A, B, C, and D. The
number of bits actually available for carrying signaling information, and the data
rate at which signaling information can be transferred depend on the main link
type (E1 or T1), the framing mode and the encoding type (PCM or ADPCM) being
used. Refer to the Megaplex-2100 System Installation and Operation Manual for
additional information.
As explained in Megaplex-2100 System Installation and Operation Manual, the
number of bits available for the transfer of channel-associated signaling of each
payload timeslot is as follows:
•
For E1 trunks with G.732S framing (16-frame multiframe), timeslot 16 carries
four signaling bits for each payload timeslot. No signaling bits are present in
the G.732N mode. In ADPCM mode two signaling bits are available for each
channel.
•
For T1 trunks with ESF framing (24-frame multiframe), the multiframe structure
includes four signaling bits for each payload timeslot. In ADPCM mode two
signaling bits are available for each channel.
•
For T1 trunks with SF (D4) framing (12-frame multiframe), the multiframe
structure includes two signaling bits for each payload timeslot. In ADPCM
mode only one signaling bit is available for each channel.
For your convenience, Table 1-4 lists the number of signaling bits as a function of
voice encoding and framing method.
Table 1-4. Number of Available Signaling Bits
Voice
Encoding
PCM
ADPCM
E1 Main Link
Signaling Type
T1 Main Link
G.732S
G.732N
ESF
SF (D4)
4
Not supported
Not supported
Not supported
Robbed Bit Multiframe
(RBMF)
Not supported
Not supported
4
2
Robbed Bit Frame (RBF)
1
1
1
1
CAS
2
Not supported
Not supported
Not supported
Not supported
Not supported
2
1
CAS
Robbed Bit Multiframe
(RBMF)
Functional Description
1-13
VC-6A Installation and Operation Manual
Chapter 1 Introduction
Signaling Modes
The VC-6A modules have two categories of signaling modes with respect to
encoding mode selected:
Signaling for PCM
•
Channel Associated Signaling (CAS) transmitted in timeslot 16, compatible with
ITU-T Rec. G.704. This mode is available on VC-6A modules installed in
systems using E1 main links only, and therefore is generally used with A-law
companding, in accordance with the applicable E1 standards. CAS can be
used only when the main link framing format is G.732S.
•
Inband “Robbed Bit Multiframe” (RBMF) signaling transfer. Available for
VC-6A modules installed in systems using T1 main links only, this method is
compatible with ITU-T Rec. G.704 and AT&T Pub. 43801, and is generally
used with µ-law companding, in accordance with the applicable T1 standards.
•
Proprietary “Robbed Bit Frame” (RBF) signaling, applicable for both A-law and
µ-law encoding, which avoids the need for multiframe synchronization. This
method allocates the least significant bit of each channel to its own signaling
information. Therefore, signaling is transparently transferred within the timeslot
carrying the encoded audio signal, but because PCM encoding is effectively
done with 7-bit resolution, there is a slight decrease in transmission quality.
This proprietary method allows the transmission of 31 voice channels by a
Megaplex system with E1 links, even when using G.732N framing.
•
No Signaling transmits no signaling information, and therefore it is suitable for
applications which do not need end-to-end signaling, or can use only in-band
signaling, e.g., DTMF.
Signaling for ADPCM
The signaling is slightly different when using ADPCM voice encoding:
•
E1 used as main link – timeslot 16 consists of four bits A, B, C, D (as in PCM)
for a specific timeslot. However, since in ADPCM mode each channel requires
only half a timeslot, the first two bits serve the first channel and the last two
bits serve the second channel.
A B A B A B A B
CH1
TS1
1-14
Functional Description
CH2
CH1
CH2
TS17
VC-6A Installation and Operation Manual
•
Chapter 1 Introduction
T1 used as main link - The A, B, C and D bits of each channel are transmitted
through the following frames:
ESF Framing: 6,12,18 and 24. Each channel has two signaling bits.
SF Framing: 6 and 12 only. Each channel has a single signaling bit.
A
A
B
B
CH1
CH2
CH1
CH2
Frame
6
Frame
12
Frame
18
Frame
24
In ESF Mode Only
For your convenience, Table 1-5 lists the signaling types supported in the various
main link framing modes:
•
OK means that the corresponding type is the type specified by the applicable
standards.
•
Warning means that the corresponding type is supported, but is not in
accordance with the applicable standards, and therefore can only be used
when Megaplex systems are located at both ends of the link. In this case, the
system generates a warning message.
•
Error means that the corresponding type is not supported. In this case, the
system generates an error message.
Table 1-5. Signaling Modes
Signaling Type
No Signaling
Robbed Bit Multiframe (RBMF)
CAS
Robbed Bit Frame (RBF)
E1 Main Link
T1 Main Link
G.732S
G.732N
ESF
SF (D4)
OK
OK
OK
OK
Error
Error
OK
OK
OK
Error
Error
Error
Warning
Warning
Warning
Warning
Signaling Profiles
The format of the signaling information is defined for the VC-6A by selecting one
of six predefined profiles. The profile defines the information carried by each
signaling bit transmitted by the module channel, and the signaling bit read by the
receive path (normally the bits at both ends of a link are used in a similar way,
however the signaling mechanism of the VC-6A modules provides flexibility in the
selection of the received bit).
The profile defines the information carried by each signaling bit transmitted by a
voice channel, and the interpretation of each signaling bit. The selections for the
receive path may differ from the transmit path to support the conversion of
signaling formats.
Functional Description
1-15
VC-6A Installation and Operation Manual
Chapter 1 Introduction
•
In the transmit path, each of the signaling bits can carry the following
information:
State of M lead
Inverted state of M lead
Forced to either “0” or “1”
Metering
Polarity reversal detection
Any signaling bit can also be disconnected (not transmitted to the remote end).
•
Note
In the receive path the state of the E lead can be determined by any signaling
bit (inverted or non-inverted), or the E lead can be forced to idle.
Signaling profiles can also be selected, as well as manually defined, at the System
level. This signal profile is used by the Megaplex main link (e.g. ML-2E1) modules.
Changing the default “transparent” profile setting of the main link module will alter
the final signaling bit definition from what was selected in the VC-6A module.
Therefore, to ensure that the signaling bits are actually transmitted according to the
VC-6A’s profile definition, verify that:
• The main link module’s Sig.Profile parameter is set for the default 1
(“transparent”). See the appropriate main link Installation and Operation Manual
for details.
• The System’s Profile 1 default Rx/Tx Translation has not been changed (i.e. A=A,
B=B, etc.). See DEF PROFILE command in the Megaplex-2100/2104 System
Installation and Operation Manual for details.
For Megaplex systems operating with T1 links, to use VC-6A modules in either
Profile 1 or Profile 2, changes must be made to the ML-2T1 module’s signaling
profile configuration. For details, see Appendix B.
VC-6A currently supports six profiles:
1-16
•
Profile 1 is intended for use when two E&M modules are connected in a link (a
typical application of this type is shown in Figure 1-2), when an FXS module is
connected in a link with an FXO module (a typical application of this type is
shown in Figure 1-3); when an E&M module is connected in a link with an FXS
or FXO module; or when two FXS modules are connected in a link (a typical
application of this type is shown in Figure 1-4).
•
Profile 2 is used to enable connection of FXO or FXS modules to T1 trunks
ending in the PSTN (a typical application of this type is shown in Figure 1-5),
however FXO modules using profile 2 can also be connected to FXS modules
using profile 2.
•
Profile 2 is supported by systems with T1 links only. It is not supported by E&M
modules.
•
Profiles 3R, 3M and 3RM are used with the VC-6A/FXS or VC-6A/FXO
modules which are equipped with dedicated circuitry for generating/detecting
battery polarity reversal to connect to exchanges using wink-start signaling (see
Figure 1-6), and 12/16 kHz metering pulses for serving payphones (see
Figure 1-7). These profiles support both transfer of call control signaling
information and the metering information for billing:
Functional Description
VC-6A Installation and Operation Manual
Chapter 1 Introduction
3R – for Reverse battery polarity signal transfer
3M – for Metering pulse (16/12 kHz) generation/detection signal transfer
3RM – for both battery polarity reversal, and 16/12 kHz metering pulse
generation/detection signal transfer
Note
•
Profiles 3R, 3M and 3RM are not supported by VC-6A/E&M or VC-6AG
modules. These profiles are not supported when using ADPCM compression
mode by systems with E1 links.
•
Profile 4 – This profile is mostly used with special exchanges and central office
equipment.
Profile 4 is not supported when using ADPCM compression mode.
For your convenience, the signaling profiles information, including a summary of
profile compatibility, is detailed in Appendix B at the end of this manual.
OOS Signaling
In case the communication between modules located in different Megaplex units
fails, e.g., because loss of synchronization, etc., it is necessary to control the state
of the signaling information at the two ends of the link. This activity, called
out-of-service (OOS) signaling, can be selected in accordance with the specific
application requirements, on a per-channel basis.
•
The OOS signaling options supported by the VC-6A/E&M modules are as
follows:
Signaling forced to the idle state for the duration of the out-of-service
condition (forced idle).
Signaling forced to the busy state for the duration of the out-of-service
condition (forced busy).
Signaling forced to the idle state for 2.5 seconds, and then changed to the
busy state for the remaining duration of the out-of-service condition
(idle-busy).
Signaling forced to the busy state for 2.5 seconds, and then changed to the
idle state for the remaining duration of the out-of-service condition
(busy-idle).
•
The FXO modules support the forced-idle, forced-busy and idle-busy options
only.
•
The FXS modules support the forced-idle option only.
Configuration and Management
All the VC-6A modules operating parameters (excluding the VC-6A/E&M signaling
type) are controlled by means of the Megaplex system management.
Test and Diagnostic Capabilities
The VC-6A module automatically performs self-test upon power-up and during
normal operation.
For diagnostics purposes, each module channel has indicators that indicate its
state, e.g., the state of the E and M lines for the VC-6A/E&M version, and thus
Functional Description
1-17
VC-6A Installation and Operation Manual
Chapter 1 Introduction
enable the user to check for proper response to the state of its telephone set or
equipment.
The diagnostic features include:
•
Local digital loopback per channel (in PCM) or per pair of channels (in
ADPCM) towards local analog side.
•
Remote analog loopback per channel towards remote side.
•
1 kHz, 0 dBm0, tone injection on a channel towards remote side. Using this
function in conjunction with the loopback functions enables the user to check
rapidly and efficiently the local equipment and its connection to the module
channel. Only one Tone Inject operation can be active on a module at the
same time.
•
The user can request that a loopback (or the test tone injection) is
automatically deactivated after a user-selected interval, thereby reducing the
management workload during system troubleshooting.
1.4 Technical Specifications
Number of
Channels
6
PCM
Bandwidth
Requirements ADPCM
64 kbps per enabled channel (one timeslot)
Voice
Encoding
Technique
Modulation
Technique
PCM: per ITU-T Rec. G.711 and AT&T Pub. 43801
Companding
µ-law or A-law (soft-selectable)
Line Type
E&M: 4-wire or 2-wire (soft-selectable)
Analog
Interface
Analog
Parameters
1-18
32 kbps per enabled channel (one timeslot per pair of
channels)
ADPCM: per ITU-T G.726
FXS, FXO: 2-wire
ITU-T
Recommendations
2-wire: ITU-T Rec. G.713
Nominal Level
0 dBm
Nominal
Impedance
600 Ω
Return Loss (ERL) at
300 to 3400 Hz
Better than 20 dB
Frequency
Response (Ref:
1020 Hz)
0 dB ±0.5 dB, at 300 to 3000 Hz
0 dB ±1.1 dB, at 250 to 3400 Hz
Technical Specifications
4-wire: ITU-T Rec. G.712, G.714
VC-6A Installation and Operation Manual
Chapter 1 Introduction
Level adjustment
(soft-selectable)
E&M
TX: +8 to -17 dBm
RX (2-wire): +2 to -23 dBm
RX (4-wire): +2 to -17 dBm without amplification
+8 to -17 dBm with amplification
FXS
TX: +8 to -13 dBm
RX: +2 to -17 dBm
FXO
TX: +7 to -18 dBm
RX: +1 to -23 dBm
Steps
0.5 dB (±0.15 dB), nominal
Signal to Total
Distortion (8-bit
PCM encoding)
ITU-T Rec. G.712, G.713 Method 2:
Idle Channel Noise
Better than -65 dBm0 (+20 dBrnc)
Transformer
Isolation
1500 VRMS
E&M Interface Signaling method
(user-selectable)
• 0 to -30 dBm0: better than 33 dB
• +3 to -45 dBm0: better than 22 dB
• EIA RS-464 E&M Type I
• EIA RS-464 E&M Type II, III and V (British Telecom
SSDC5) using internal -12 VDC in place of -48 VDC
Note: For full support of Types II, III, and V (SSDC5) signaling
standards, a -48 VDC supply is required. To support this, an
optional 3-pin connector on the module panel, or an optional
internal connector to the chassis voltage bus must be ordered.
FXS Interface
Pulse dial distortion
±2 msec max
Signaling methods
VC-6A/FXS: EIA-RS-464 loop-start and wink-start
VC-6AG/FXS: EIA-RS-464 loop-start and ground-start
On-hook/Off-hook
threshold
(where Vin = -20 VDC to -56 VDC)
• 3V to 80% Vin between Tip and Ring at Off-Hook state
• Higher than 83% Vin between Tip and Ring at On-Hook
state
Feed current
22 mA (±10%)
Ringer
86 VRMS (when providing 4 REN or less) to 45 VRMS (when
providing 12 REN max), 20 Hz (±10%);
Overload protected, 1 second ON, 3 seconds OFF
Technical Specifications
1-19
VC-6A Installation and Operation Manual
Chapter 1 Introduction
VC-6A/FXS only
FXO Interface
Metering pulse
generation
Output frequency: +12 or 16 kHz (±2 Hz), user-selectable
Output Level
1.7 VRMS
Reversal polarity
pulse distortion
6 msec max
Signaling methods
VC-6A/FXS: EIA-RS-464 loop-start and wink-start
VC-6AG/FXS: EIA-RS-464 loop-start and ground-start
DC impedance
• Off-hook: 100 Ω at 100 mA feed, 230 Ω at 25 mA feed
• On-hook: above 1 M Ω
Ring detector
20 kΩ @ 20 Hz, 70 VRMS
Detection: At least 20 VRMS, 17 to 25 Hz
No detection: Maximum 5 VRMS
VC-6A/FXO only
End-to-end
Signaling
Metering pulse
detection
frequency
+12 or 16 kHz (±2 Hz), user-selectable
Reversal polarity
pulse distortion
6 msec max
T1 main links
• Robbed Bit Multiframe (RBMF) signaling:
667 samples per second with SF (D4) framing;
333 samples per second with ESF framing
• Proprietary Robbed Bit Frame (RBF) signaling:
8000 samples per second
• No Signaling
E1 main links
• Channel Associated Signaling per ITU-T Rec. G.704,
para. 3.3.32.
• Proprietary Robbed Bit Frame (RBF) signaling:
8000 samples per second
• No Signaling
1-20
Technical Specifications
VC-6A Installation and Operation Manual
Chapter 1 Introduction
• Local digital loopback for each channel (in PCM) or pair
of channels (in ADPCM), towards the local user
equipment
Diagnostics
• Remote analog loopback for each channel, towards the
remote user equipment
• 1 kHz, 0 dBm0 test tone inject for one channel at a time,
towards the remote user equipment
• Self test for entire system upon power-up
Indicators
(per channel)
Connectors
Configuration
E&M
E-lead, M-lead
FXS
Remote Call, Local Off-Hook
FXO
Ring Detect, Remote Off-Hook
E&M
Single 50-pin TELCO connector (for all channels)
FXS, FXO
Six 6-pin RJ-11 connectors (one per channel)
Programmable via the system management
Technical Specifications
1-21
Chapter 1 Introduction
1-22
Technical Specifications
VC-6A Installation and Operation Manual
Chapter 2
Installation and Setup
2.1
Introduction
This chapter provides installation and operation instructions for the various VC-6A
modules. The information presented in this chapter supplements the general
Megaplex-2100 installation, configuration and operation instructions contained in
the Megaplex-2100 Installation and Operation Manual.
Warning
Note
Before performing any internal settings, adjustment, maintenance, or repairs,
first disconnect all the cables from the module, and then remove the module
from the Megaplex enclosure.
No internal settings, adjustment, maintenance, and repairs may be performed
by either the operator or the user; such activities may be performed only by a
skilled technician who is aware of the hazards involved.
Always observe standard safety precautions during installation, operation, and
maintenance of this product.
The VC-6A modules contain components sensitive to electrostatic discharge (ESD).
To prevent ESD damage, always hold the module by its sides, and do not touch the
module components or connectors.
2.2
Setting Internal Jumpers and Switches
VC-6A/FXS, VC-6A/FXO, VC-6AG/FXS, and VC-6AG/FXO module versions do not
include any internal user settings, and all their functions are programmable.
The VC-6A/E&M module version has several internal switches, which are used to
select the signaling mode. The signaling mode is simultaneously selected for all the
channels. Table 2-1 lists the required switch settings.
In addition, a set of jumpers (S1-S7) enables the user to amplify the channels’
Receiver level, when operating with 4-wire interface. Table 2-2 lists the required
jumper settings.
Figure 2-1 identifies the positions of the module’s user-selectable components.
Setting Internal Jumpers and Switches
2-1
VC-6A Installation and Operation Manual
Chapter 2 Installation and Setup
S1
ADPCM
Sub-board
ON
SW3
SW2
(not installed on
P option modules)
SW1
F4
F5
S2
S3
OFF
F6
F7
S4
S5
F8
F9
RX Amplification
S1, S2, S3, S4,
S5, S6, S7
S6
OFF
F10
F11
Default
S1, S2, S3, S4,
S5, S6, S7
F12
F13
ON
For 4-Wire
only
F14
F15
S7
Figure 2-1. VC-6A/E&M Module, Internal Settings
Table 2-1. Selection of E&M Signaling Mode
Signaling Mode
Switch SW1
Switch SW2
Switch SW3
RS-464 Type I
ON
ON
ON
RS-464 Type II
ON
OFF
ON
RS-464 Type III
ON
ON
ON
RS-464 Type V
OFF
OFF
OFF
BT SSDC5
OFF
OFF
OFF
The E&M module signaling mode is factory-set for RS-464 Type V / BT SSDC5.
Table 2-2. Selection of Channels’ RX Level Amplification (VC-6A/E&M 4-wire only)
Note
Jumper No.
State
Amplification
S1, S2, S3, S4, S5, S6, S7
ON
OFF
+8 dBm
+2 dBm
All Jumpers must be in the same position. If 2-wire interface is used, all the
amplification jumpers must be set to OFF.
To configure the VC-6A/E&M module:
1. Select the signaling mode as required according to Table 2-1.
2. Set the channels’ RX amplification as required according to Table 2-2.
2-2
Setting Internal Jumpers and Switches
VC-6A Installation and Operation Manual
2.3
Chapter 2 Installation and Setup
Inserting the Module into Enclosure
Refer to the system installation plan, and insert the module in the assigned I/O slot
of the Megaplex enclosure. The module starts operating as soon as it is plugged
into an operating enclosure.
2.4
Connecting the Cables
Connecting the Voice Channels
For the VC-6A/FXS, VC-6A/FXO, VC-6AG/FXS, and VC-6AG/FXO modules, the
voice channels are terminated on a separate RJ-11 female connector for each
channel. Connector pin assignment is described in Appendix A.
For the VC-6A/E&M module, all the voice channels are terminated on a single
TELCO 50-pin female connector. Connector pin assignment is described in
Appendix A. You may either connect a cable prepared in accordance with
Appendix A to the TELCO connector of the module, or use an adapter cable for
direct connection to the equipment using the voice channels. A suitable cable,
designated CBL-VC16, is available as an option from RAD: this cable has a mating
TELCO 50-pin connector for connection to the module, and six RJ-45 male
connectors (one for each channel) for direct connection to the user's equipment.
Cable length is 1.5 meters (5 feet).
Connecting the External -48 VDC Voltage
The external -48 VDC feed voltage can be supplied to the VC-6A/E&M,
VC-6A/FXS, or VC-6AG/FXS modules from the following sources:
Note
•
Internal DC voltage distribution – the module receives the required voltage via
an internal connector to the chassis voltage distribution bus. The chassis
receives the DC voltages either from an appropriate DC power supply, an
installed Ringer-2100R/3000R module (Megaplex-2100), or a built-in ringer
option (Megaplex-2104 only). No external cable connections are required.
•
Internal DC voltage distribution via external connection to chassis
(Megaplex-2100 only) – the module receives the required voltage via an
internal connector to the chassis voltage distribution bus, as in the method
described above. The chassis receives the DC feed voltage externally (for
example, from a Ringer module/standalone unit) via a cable connected to the
dedicated 3-pin RINGER-IN connector on the chassis power supply module.
For subscriber feed voltage, FXS modules can operate with any VDC input between
-20 VDC to -56 VDC. This will be sufficient for supporting most applications.
However, using input less than the nominal -48 VDC will shorten the range of the
loop span. For example, -24 VDC input will only support loop spans which do not
exceed 1 km.
To connect the -48 VDC, VC-6A/E&M modules must be ordered with an optional
internal connector to the chassis voltage bus.
Connecting the Cables
2-3
Chapter 2 Installation and Setup
VC-6A Installation and Operation Manual
RAD offers a variety of Ringer standalone units and modules, which provide the
required VDC power for the Megaplex modules. Refer to appropriate Ringer
Installation and Operation Manual for details.
Caution Since an external voltage source can supply voltage even when the Megaplex is
not operating, observe the following precautions:
Always turn off the external -48 VDC source, e.g., Ringer-2000, before the
Megaplex enclosure is turned off.
Never connect external -48 VDC voltages to modules installed in a Megaplex
enclosure if it is not operating.
Do not connect/disconnect the Ringer while it is operating.
2.5
Normal Indications
The module starts operating as soon as it is plugged into an operating Megaplex
enclosure. During normal operation, the two indicators of each channel indicate
the channel activity:
•
For E&M channels, the E and M indicators indicate the activity on the signaling
leads of the corresponding channel.
•
For FXO channels, the RING indicator lights when ringing is received from the
local switch or PBX on the corresponding channel, and the REM O.H indicator
lights when the remote subscriber is in the off-hook state.
For FXS channels, the REM CALL indicator lights when a call initiated by the
subscriber connected to the remote side is being handled by the corresponding
channel, and the LOC O.H indicator lights when the local subscriber is in the
off-hook state.
2-4
Normal Indications
Chapter 3
Configuring the Module
3.1
Overview
This chapter describes the configuration parameters of the VC-6A modules. The
procedures used to select these parameters depend on the management system
used to control the Megaplex-2100 systems.
Instructions can be found as follows:
•
Supervision terminal and Telnet – according to the Megaplex-2100 Installation
and Operation Manual
•
RADview network management system – according to the appropriate User's
Manual.
3.2
Configuration Parameters
Module Parameters
Table 3-1 explains the general programmable VC-6A module parameters and their
range of values.
Table 3-1. Module VC-6A, General Parameters
Parameter
Description
Wires Num
Specifies the interface to be used by the voice channels:
4 WIRES
2 WIRES
Coding
4-wire interface, available only for the VC-6A/E&M module
2-wire interface
Specifies the companding law to be used by the voice channels:
a LAW
u LAW
A-law coding, intended for use on E1 links
µ-law coding, intended for use on T1 links
Configuration Parameters
3-1
VC-6A Installation and Operation Manual
Chapter 3 Configuring the Module
Table 3-1. Module VC-6A, General Parameters (Cont.)
Parameter
Description
Signaling
This field specifies the end-to-end signaling transfer method. The signaling transfer
options depend on the type of main link module installed in the Megaplex enclosure:
With T1 link modules (e.g., ML-2T1):
RBMF SIGNALING
Robbed bit signaling in accordance with AT&T Pub 43801.
ROBBED BIT
Proprietary “robbed bit” signaling method that does not require
FRAME
multiframe synchronization (7-bit PCM with channel signaling
carried by the eighth bit of each channel).
NO SIGNALING
Channel signaling is not transferred.
With E1 link modules (e.g., ML-2E1):
Profile
CAS
Channel-associated signaling in accordance with ITU-T Rec.
G.704.
ROBBED BIT
Proprietary “robbed bit” signaling method that does not require
FRAME
multiframe synchronization (7-bit PCM with channel signaling
carried by the eighth bit of each channel).
NO SIGNALING
Channel signaling is not transferred.
Specifies the signaling profile (refer to Chapter 1 and Appendix B of this manual for
explanations and restrictions on the different signaling profiles):
1
Signaling profile 1
2
Signaling profile 2 (not supported by the VC-6A/E&M module)
3R
Signaling profile 3R (for VC-6A/FXS and VC-6A/FXO modules only)
3M
Signaling profile 3M (for VC-6A/FXS and VC-6A/FXO modules only)
3RM
Signaling profile 3RM (for VC-6A/FXS and VC-6A/FXO modules only)
4
Signaling profile 4
Note that if NO SIGNALING is selected for the Signaling parameter field above, the
profile is ignored
OOS
Specifies the state of the E lead of an Out-Of-Service channel, as appears to the PBX:
IDLE-BUSY
Signaling held at on-hook state (IDLE) for 2.5 seconds, followed by
off-hook state (BUSY) for the duration of the out-of-service condition.
BUSY-IDLE
Signaling held at off-hook state (BUSY) for 2.5 seconds, followed by
on-hook state (IDLE) for the duration of the out-of-service condition.
FORCED-IDLE Signaling held at on-hook state (IDLE) for the duration of the
out-of-service condition.
FORCED-BUSY Signaling held at off-hook state (BUSY) for the duration of the
out-of-service condition.
Notes:
• E&M modules support all options.
• FXO modules support IDLE-BUSY, FORCED-IDLE, or FORCED-BUSY options only.
• FXS modules support FORCED-IDLE only.
ML Slot
3-2
Selects the main link module to which the VC-6A will be connected. The main link
module is specified by indicating the number of the I/O slot in which the desired main
link module is installed: IO-1 to IO-12
Configuration Parameters
VC-6A Installation and Operation Manual
Chapter 3 Configuring the Module
Table 3-1. Module VC-6A, General Parameters (Cont.)
Parameter
Description
ML Channel
Selects channel (link) of the main link module, to which the VC-6A will be connected:
EX1 or EX2
Encoding
Specifies the voice encoding employed on all channels: PCM or ADPCM
(VC-6A modules ordered with P option [no ADPCM sub-board] support only PCM
encoding)
Interface
Specifies the signaling method used for all channels: Loop Start or Ground Start.
(Ground Start supported only on VC-6AG/FXS and VC-6AG/FXO)
Metering
Specifies the pulse metering frequency: 12kHz or 16kHz
(Supported only on VC-6A/FXS and VC-6A/FXO)
Channel Parameters
Table 3-2 explains the programmable channel parameters and their range of
values.
Table 3-2. Module VC-6A, Channel Parameters
Parameter
Description
Connect
Determines whether the channel is connected to the main link:
YES
channel is connected
NO
channel is disconnected. You can still program the desired parameters, so the
channel will be ready for operation when needed
Note that in ADPCM mode, consecutive channels (e.g. CH 1–2, 3–4, 5–6) must be
connected in pairs (both must use the same Connect setting)
Transmit Level
Selects the nominal input level of the transmit path in 0.5 dB steps:
• For E&M channels, the input level can be set in the range of
+8 dBm to -17 dBm.
• For FXS channels, the input level can be set in the range of
+8 dBm to -13 dBm.
• For FXO channels, the input level can be set in the range of
+7 dBm to -18 dBm.
Select the transmit level to match the transmission level point (TLP-transmit) of the
equipment connected to the channel. Figure 3-1 explains how to determine the required
level setting.
Note that the application of an input signal at the nominal transmit level results in 0dBm
digital level, and a far-end output signal equal to the far-end nominal receive level
Configuration Parameters
3-3
VC-6A Installation and Operation Manual
Chapter 3 Configuring the Module
Table 3-2. Module VC-6A, Channel Parameters (Cont.)
Parameter
Description
Receive Level
Selects the nominal output level of the receive path:
For E&M channels, the output level can be set in 0.5 dB steps in the range of:
• 2-wire:
+2 dBm to -23 dBm
• 4-wire:
+2 dBm to -17 dBm, or
+8 dBm to -17 dBm with amplification jumpers ON (see Section 2.2).
For FXS channels, the output level can be set in 0.5 dB steps in the range of
+2 dBm to -17 dBm.
For FXO channels, the output level can be set in 0.5 dB steps in the range of
+1 dBm to -23 dBm.
Select the receive level to match the TLP-receive of the equipment connected to the
channel (see Figure 3-1).
Operation Mode
Selects the operating mode of the channel:
BI-DIRECTIONAL
Normal (point-to-point) mode.
UNIDIRECTIONAL
Channel operates in the unidirectional mode. In this mode, it can
only receive the signals carried by the assigned timeslot, but
cannot transmit. The mode is available only for E&M and FXS
modules.
BROADCAST
Channel operates in the bidirectional mode. In this mode, the
channel receives the signals carried by the assigned timeslot, and
will transmit only when the M input is active. The mode is
available only for E&M and FXS modules.
Refer to Unidirectional and Broadcast Applications in Chapter 1 for details.
VC-6A Channel
Transmit TLP:
-16dB
T
R
Transmit
Input Circuit
Nominal Level
= 0 dBm
Adjust Level to -16dBm
Receive TLP:
-2dB
T1
R1
Signal
Processor
Receive
Output Circuit
Adjust Level to -2dBm
Figure 3-1. Selection of Transmit and Receive Levels
After performing the configuration of the individual module channels, it is
necessary to assign a main link timeslot to each connected channel, as explained
in the Megaplex-2100 Installation and Operation Manual.
3-4
Configuration Parameters
Chapter 4
Diagnostics and
Troubleshooting
4.1 Scope
This chapter explains the module specific tests and diagnostic functions, provides
troubleshooting instructions, and lists the most popular FAQs on the VC-6A
modules.
The diagnostic information presented in this chapter supplements the general
Megaplex-2100 diagnostics operation instructions contained in the Megaplex-2100
System Installation and Operation Manual.
4.2 Test and Diagnostic Functions
The available test and diagnostics functions are:
•
Local digital loopback on the desired module channel (or channel pair)
•
Remote digital loopback on the desired module channel
•
Tone Injection
The VC-6A modules have a complete set of test loops that includes local digital
loops on each channel in PCM mode, or pair of channels in ADPCM mode.
Remote analog loops can be run on each channel. In addition, the VC-6A modules
have provisions for the digital injection of a test tone towards the remote
subscriber. This tone is sent instead of the local transmit signal, and provides a
controlled test signal that allows rapid testing: the tone should be received by the
remote subscriber at the nominal receive level, and should be heard loudly and
clearly.
When a test or loopback is activated, the user can also specify the time it remains
active: the range is 1 through 30 minutes, in 1-minute steps. After the specified
time, the test or loopback is automatically deactivated, thereby reducing the
management workload during system troubleshooting. The default selection is
continuous connection, that is, the test or loopback remain active until canceled
by a user's command. The following sections describe the available diagnostic
activities.
Test and Diagnostic Functions
4-1
VC-6A Installation and Operation Manual
Chapter 4 Diagnostics and Troubleshooting
Local Digital Loopback (Local Loop)
The local loop is a digital loop performed at the digital output of the channel
COMBO, by returning the transmit signal of the channel(s) in the same timeslot of
the receive path. The transmit signal is still sent to the remote Megaplex unit. Since
the loop is performed on the entire timeslot, in effect, the local loop is run per
channel when in PCM mode, and per pair of channels when in ADPCM mode.
Note
In ADPCM mode, the local loop is performed on both channels assigned to the
same timeslot. For example, if CH1 and CH2 reside in the same timeslot, testing
CH1 will result CH2 to also be in local loop state, and vice versa.
The loopback signal path is shown in Figure 4-1.
Channel 1
..
..
User or
Test
Equipment
Channel 5
..
..
.
..
..
.
..
..
.
VC-6A
I/O Modules
I/O Modules
VC-6A
Local
Unit
User or
Test
Equipment
Remote
Unit
System
Management
Figure 4-1. Local Loop, Signal Path
Remote Analog Loopback (Remote Loop)
The remote loop is an analog loop performed at the analog output of the channel
COMBO, by returning the analog receive signal of the channel to the input of the
transmit path. The receive signal remains connected to the local user, and can be
received by user. While the loop is connected, the remote voice channel should
receive its own signal, e.g., a strong sidetone should be heard in the earpiece if the
channel is connected to a telephone set.
The loopback signal path is shown in Figure 4-2.
4-2
Test and Diagnostic Functions
VC-6A Installation and Operation Manual
Channel 1
..
..
User or
Test
Equipment
Channel 5
Chapter 4 Diagnostics and Troubleshooting
..
..
.
..
..
.
..
..
.
VC-6A
VC-6A
I/O Modules
I/O Modules
Local
Unit
User or
Test
Equipment
Remote
Unit
System
Management
Figure 4-2. Remote Loop, Signal Path
Tone Injection
The test tone is a data sequence repeating at a rate of 1 kHz. This data sequence is
identical to the data sequence that would have been generated if a 1-kHz signal
having a nominal level of 1 mW (0 dBm0) were applied to the input of the
channel codec.
The tone is injected to the local transmit path multiplexer, instead of the transmit
signal of the channel. The signal received from the other end remains connected
to the local subscriber.
The tone can be injected to only one channel at a time.
Figure 4-3 shows the signal path.
Test and Diagnostic Functions
4-3
VC-6A Installation and Operation Manual
Chapter 4 Diagnostics and Troubleshooting
Channel 1
..
..
User or
Test
Equipment
Channel 5
..
..
.
..
..
.
..
..
.
Test
~ Tone
VC-6A
VC-6A
I/O Modules
I/O Modules
Local
Unit
User or
Test
Equipment
Remote
Unit
System
Management
Figure 4-3. Test Tone Injection Path
4.3 Troubleshooting Instructions
The test tone injection function and the loops available on the VC-6A module
provide a rapid and efficient way to identify the general location of a fault at either
of the two VC-6A modules connected in a link, in the external equipment, or in
the connections to the channels.
If a complaint is received from one of the subscribers connected to the VC-6A
channels, first activate the VC-6A local test loop at the side where the complaint is
received from. The local subscriber must receive its own signal.
If the signal is not received, the problem is at the local end:
•
Check the connections to the subscriber equipment.
•
Replace the local VC-6A module.
If the local subscriber receives its own signal when the local loop is activated,
activate test tone injection toward the complaining subscriber. If the subscriber
receives the test tone, the problem is probably in the connections at the remote
side (the side that sends the tone). You can check the computer path of the remote
module channel by activating the remote loopback and the tone injection toward
the remote subscriber, and checking that the local subscriber receives the test
tone.
4-4
Troubleshooting Instructions
VC-6A Installation and Operation Manual
Chapter 4 Diagnostics and Troubleshooting
If the problem is not corrected, the procedure must be repeated at the other side
of the link. Deactivate the local loop and activate the remote loop on the remote
Megaplex unit.
4.4 Frequently Asked Questions
Q:
What is the maximum external modem speed supported by the FXS
modules?
A:
The FXS modules support the connection of an external modem up to
33.6 kbps.
Q:
What is the current provided by the FXS voice channel during an incoming
call?
A:
22 mA in off-hook, and 10mA to 15mA during the ringing.
Q:
For how many VC-6A/FXS modules can a built-in ringer of MP-2104/AC/RI
provide -48Vpower?
A:
Recently we released a new built-in Ringer for the MP2104/AC/RI (with a
new Configuration Status Letter "N"), which can support up to 60 x FXS
channels, i.e. 10 x VC-6A/FXS modules. However, customer that has a
chassis with Configuration Status Letter "M", than due to the -48V
consumption, only 5 VC-6A/FXS modules could be supported. (A built-in
ringer of MP-2104/AC/RI can provide up to 1.2A, whereas a VC-6A/FXS
module consumes 240 mA).
Q:
How many VC-6A/FXS modules does the Ringer support?
Which Ringer is recommended?
A:
The Ringer-2100R module supports up to 40 concurrently active VC
channels. Ringer-2200N can support up to 200 active channels; when the
maximum number of active channels does not exceed 100, the Ringer-2000
can also be used.
Q:
Which Megaplex voice modules support Reversal Polarity and Pulse
Metering features?
A:
VC-4, VC-8, VC-16 and VC-6A modules.
4.5 Technical Support
Technical support for this product can be obtained from the local distributor from
whom it was purchased.
For further information, please contact the RAD distributor nearest you or one of
RAD's offices worldwide. This information can be found at www.rad.com (offices –
About RAD > Worldwide Offices; distributors – Where to Buy > End Users).
Technical Support
4-5
Chapter 4 Diagnostics and Troubleshooting
4-6
Technical Support
VC-6A Installation and Operation Manual
Appendix A
Connector Wiring
A.1
VC-6A/E&M Connector
The VC-6A/E&M modules have a single female 50-pin TELCO connector, wired in
accordance with Table A-1. Table A-1 also details the pin assignment of the
CBL-VC16 cable, which is used to adapt between the module’s TELCO connector
and six RJ-45 male connectors.
Table A-1. TELCO Connector Pin Assignment (E&M)
Channel
1
2
3
4
5
6
TELCO
Connector Pin
CBL-VC16
RJ-45 Pin
TELCO
Connector Pin
CBL-VC16
RJ-45
1
2
7
8
Signaling Ground (SG)
E-lead
26
27
4
5
R-IN
T-IN
4-wire RX in
3
4
1
2
Signaling Battery (SB)
M-lead
28
29
3
6
R1-OUT
T1-OUT
2-wire line;
4-wire TX out
5
6
7
8
Signaling Ground (SG)
E-lead
30
31
4
5
R-IN
T-IN
4-wire RX in
7
8
1
2
Signaling Battery (SB)
M-lead
32
33
3
6
R1-OUT
T1-OUT
2-wire line;
4-wire TX out
9
10
7
8
Signaling Ground (SG)
E-lead
34
35
4
5
R-IN
T-IN
4-wire RX in
11
12
1
2
Signaling Battery (SB)
M-lead
36
37
3
6
R1-OUT
T1-OUT
2-wire line;
4-wire TX out
13
14
7
8
Signaling Ground (SG)
E-lead
38
39
4
5
R-IN
T-IN
4-wire RX in
15
16
1
2
Signaling Battery (SB)
M-lead
40
41
3
6
R1-OUT
T1-OUT
2-wire line;
4-wire TX out
17
18
7
8
Signaling Ground (SG)
E-lead
42
43
4
5
R-IN
T-IN
4-wire RX in
19
20
1
2
Signaling Battery (SB)
M-lead
44
45
3
6
R1-OUT
T1-OUT
2-wire line;
4-wire TX out
21
22
7
8
Signaling Ground (SG)
E-lead
46
47
4
5
R-IN
T-IN
4-wire RX in
23
24
1
2
Signaling Battery (SB)
M-lead
48
49
3
6
R1-OUT
T1-OUT
2-wire line;
4-wire TX out
Function
Function
VC-6A/E&M Connector
A-1
VC-6A Installation and Operation Manual
Appendix A Connector Wiring
Note
Pin 25 is connected to the internal signal ground.
Pin 50 is not connected.
A.2
FXS and FXO Modules Connectors
The VC-6A/FXS, VC-6AG/FXS, and VC-6A/FXO modules have six RJ-11 female
connectors (one per channel) wired in accordance with Table A-2. The pin
assignment for the VC-6AG/FXO module RJ-11 connectors is listed in
Table A-3.
Table A-2. RJ-11 Connector Pin Assignment (FXS and FXO)
Pin
Function
3
Ring
4
Tip
1, 2, 5, 6
Not Connected
Table A-3. RJ-11 Connector Pin Assignment (VC-6AG/FXO only)
Pin
A-2
Function
3
Tip
4
Ring
1, 2, 5, 6
Not Connected
FXS and FXO Modules Connectors
Appendix B
Signaling Profiles
B.1
Introduction
Table B-1 through Table B-6 show the signaling bit definition (“0” or “1”) for every
function of each VC-6A profile according to the main link type, framing method
and compression mode used. “x” in these tables means that the bit is not relevant.
Not all of the profiles are supported by all the module versions. The chart below
provides the full VC-6A profile compatibility information:
Signal Profile
Module
Version
Link
Type
Compression
Mode
1
E&M
E1
PCM
9
ADPCM
9
PCM
9
ADPCM
9
PCM
9
ADPCM
9
PCM
9
ADPCM
9
PCM
9
ADPCM
9
PCM
9
ADPCM
9
T1
FXS
E1
T1
FXO
E1
T1
Note
2
3R
3M
3RM
4
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
Profiles 3R, 3M, and 3RM are supported only by VC-6A/FXS and VC-6A/FXO
modules (which support the polarity reversal and pulse metering features) and not
by VC-6AG/FXS and VC-6AG/FXO.
In order to use either Profile 1 or 2 for VC-6A modules installed in Megaplex
systems operating with T1 main links, it is necessary to change the signaling profile
configuration of the ML-2T1 module. For details, see Section B.4 at the end of this
appendix.
Introduction
B-1
VC-6A Installation and Operation Manual
Appendix B Signaling Profiles
B.2
Signaling Profiles in the PCM Mode
Table B-1, Table B-2, and Table B-3 list the PCM signaling profiles for E&M, FXS,
and FXO modules, respectively.
Table B-1. Signaling Profiles for E&M Modules in PCM Mode
Profile
1
Digital Interface
E1
Tx
Rx
T1
Tx
Rx
4
E1
Tx
Rx
T1
Tx
Rx
Analog Interface
Digital Signaling Bits
A
B
C
D
On-Hook
0
1
0
1
Off-Hook
1
1
0
1
Ring
1
x
x
x
No-Ring
0
x
x
x
On-Hook
0
0
0
0
Off-Hook
1
1
1
1
Ring
1
x
x
x
No-Ring
0
x
x
x
On-Hook
1
0
0
1
Off-Hook
0
0
0
1
Ring
0
x
x
x
No-Ring
1
x
x
x
On-Hook
1
0
0
1
Off-Hook
0
0
0
1
Ring
0
x
x
x
No-Ring
1
x
x
x
Table B-2. Signaling Profiles for FXS Modules in PCM Mode
Profile
1
Digital Interface
E1
Tx
Rx
B-2
Analog Interface
Digital Signaling Bits
A
B
C
D
On-Hook
0
1
0
1
Off-Hook
1
1
0
1
Ring
1
x
x
x
No-Ring
0
x
x
x
Signaling Profiles in the PCM Mode
VC-6A Installation and Operation Manual
Appendix B Signaling Profiles
Table B-2. Signaling Profiles for FXS Modules in PCM Mode (Cont.)
Profile
1
Digital Interface
T1
Tx
Rx
2
T1
Tx
Rx
3R
E1
Tx
Rx
T1 (ESF)
Tx
Rx
T1 (SF)
Tx
Rx
Analog Interface
Digital Signaling Bits
A
B
C
D
On-Hook
0
0
0
0
Off-Hook
1
1
1
1
Ring
1
x
x
x
No-Ring
0
x
x
x
On-Hook
0
1
0
1
Off-Hook
1
1
1
1
Ring
x
0
x
x
No-Ring
x
1
x
x
On-Hook
0
0
0
1
Off-Hook
1
0
0
1
Ring
1
x
x
No-Ring
0
x
x
Reversal Polarity
0
x
x
No Rev. Polarity
1
x
x
On-Hook
0
0
0
1
Off-Hook
1
0
0
1
Ring
1
x
x
No-Ring
0
x
x
Reversal Polarity
0
x
x
No Rev. Polarity
1
x
x
On-Hook
0
0
-
-
Off-Hook
1
0
-
-
Ring
1
-
-
No-Ring
0
-
-
Reversal Polarity
0
-
-
No Rev. Polarity
1
-
-
Signaling Profiles in the PCM Mode
B-3
VC-6A Installation and Operation Manual
Appendix B Signaling Profiles
Table B-2. Signaling Profiles for FXS Modules in PCM Mode (Cont.)
Profile
3M
Digital Interface
E1
Tx
Rx
3M
T1 (ESF)
Tx
Rx
T1 (SF)
Tx
Rx
3RM
E1
Tx
Rx
T1
Tx
Rx
Analog Interface
A
B
C
D
On-Hook
0
1
0
1
Off-Hook
1
1
0
1
Ring
1
x
x
No-Ring
0
x
x
Meter 12/16 kHz
1
x
x
No Meter
0
x
x
On-Hook
0
1
0
1
Off-Hook
1
1
0
1
Ring
1
x
x
No-Ring
0
x
x
Meter 12/16 kHz
1
x
x
No Meter
0
x
x
On-Hook
0
1
-
-
Off-Hook
1
1
-
-
Ring
1
-
-
No-Ring
0
-
-
Meter 12/16 kHz
1
-
-
No Meter
0
-
-
On-Hook
0
0
1
1
Off-Hook
1
0
1
1
Ring
1
x
No-Ring
0
x
Reversal Polarity
0
0
x
No Rev. Polarity
1
0
x
Meter 12/16 kHz
1
1
x
No Meter
1
0
x
On-Hook
0
0
1
1
Off-Hook
1
0
1
1
Ring
1
x
No-Ring
0
x
Reversal Polarity
B-4
Digital Signaling Bits
Signaling Profiles in the PCM Mode
0
0
x
VC-6A Installation and Operation Manual
Appendix B Signaling Profiles
Table B-2. Signaling Profiles for FXS Modules in PCM Mode (Cont.)
Profile
Digital Interface
Analog Interface
Digital Signaling Bits
A
E1
4
Tx
Rx
T1
Tx
Rx
B
C
D
No Rev. Polarity
1
0
x
Meter 12/16 kHz
1
1
x
No Meter
1
0
x
On-Hook
1
0
0
1
Off-Hook
0
0
0
1
Ring
0
x
x
x
No-Ring
1
x
x
x
On-Hook
1
0
0
1
Off-Hook
0
0
0
1
Ring
0
x
x
x
No-Ring
1
x
x
x
Table B-3. Signaling Profiles for FXO Modules in PCM Mode
Profile
1
Digital Interface
E1
Tx
Rx
T1
Tx
Rx
2
T1
Tx
Rx
Analog Interface
Digital Signaling Bits
A
B
C
D
No Ring Detect
0
1
0
1
Ring Detect
1
1
0
1
Rem On-Hook
0
x
x
x
Rem Off-Hook
1
x
x
x
No Ring Detect
0
0
0
0
Ring Detect
1
1
1
1
Rem On-Hook
0
x
x
x
Rem Off-Hook
1
x
x
x
No Ring Detect
0
1
0
1
Ring Detect
0
0
0
0
Rem On-Hook
0
x
x
x
Rem Off-Hook
1
x
x
x
Signaling Profiles in the PCM Mode
B-5
VC-6A Installation and Operation Manual
Appendix B Signaling Profiles
Table B-3. Signaling Profiles for FXO Modules in PCM Mode (Cont.)
Profile
Digital Interface
Analog Interface
Digital Signaling Bits
A
3R
E1,
Tx
T1 ESF
Rx
T1 SF
Tx
Rx
3M
E1,
Tx
T1 ESF
Rx
T1 (SF)
Tx
Rx
3RM
E1
Tx
Rx
B-6
B
C
D
No Ring Detect
0
0
1
Ring Detect
1
0
1
Reversal Polarity
0
0
1
No Rev. Polarity
1
0
1
Rem On-Hook
0
x
x
x
Rem Off-Hook
1
x
x
x
No Ring Detect
0
-
-
Ring Detect
1
-
-
Reversal Polarity
0
-
-
No Rev. Polarity
1
-
-
Rem On-Hook
0
x
-
-
Rem Off-Hook
1
x
-
-
No Ring Detect
0
0
1
Ring Detect
1
0
1
Meter 12/16 kHz
1
0
1
No Meter
0
0
1
Rem On-Hook
0
x
x
x
Rem Off-Hook
1
x
x
x
No Ring Detect
0
-
-
Ring Detect
1
-
-
Meter 12/16 kHz
1
-
-
No Meter
0
-
-
Rem On-Hook
0
x
-
-
Rem Off-Hook
1
x
-
-
No Ring Detect
0
1
Ring Detect
1
1
Reversal Polarity
0
0
1
No Rev. Polarity
1
0
1
Meter 12/16 kHz
1
1
1
No Meter
1
0
1
Rem On-Hook
0
x
x
x
Rem Off-Hook
1
x
x
x
Signaling Profiles in the PCM Mode
VC-6A Installation and Operation Manual
Appendix B Signaling Profiles
Table B-3. Signaling Profiles for FXO Modules in PCM Mode (Cont.)
Profile
Digital Interface
Analog Interface
Digital Signaling Bits
A
T1
Tx
Rx
4
E1
Tx
Rx
T1
Tx
Rx
B
C
D
No Ring Detect
0
1
Ring Detect
1
1
Reversal Polarity
0
0
1
No Rev. Polarity
1
0
1
Meter 12/16 kHz
1
1
1
No Meter
1
0
1
Rem On-Hook
0
x
x
x
Rem Off-Hook
1
x
x
x
No Ring Detect
1
0
0
1
Ring Detect
0
0
0
1
Rem On-Hook
1
x
x
x
Rem Off-Hook
0
x
x
x
No Ring Detect
1
0
0
1
Ring Detect
0
0
0
1
Rem On-Hook
1
x
x
x
Rem Off-Hook
0
x
x
x
Signaling Profiles in the PCM Mode
B-7
VC-6A Installation and Operation Manual
Appendix B Signaling Profiles
B.3
Signaling Profiles in the ADPCM Mode
Table B-4, Table B-5, and Table B-6 list the ADPCM signaling profiles for E&M, FXS,
and FXO modules, respectively.
Table B-4. Signaling Profiles for E&M Modules in ADPCM Mode
Profile
1
Digital Interface
E1
Tx
Rx
T1
Tx
Rx
B-8
Analog Interface
Digital Signaling Bits
A1
B1
A2
B2
On-Hook
0
1
0
1
Off-Hook
1
1
1
1
Ring
1
x
1
x
No-Ring
0
x
0
x
A1
A2
B1
B2
On-Hook
0
0
0
0
Off-Hook
1
1
1
1
Ring
1
1
x
x
No-Ring
0
0
x
x
Signaling Profiles in the ADPCM Mode
VC-6A Installation and Operation Manual
Appendix B Signaling Profiles
Table B-5. Signaling Profiles for FXS Modules in ADPCM Mode
Profile
1
Digital Interface
E1
Tx
Rx
T1
Tx
Rx
2
T1
Tx
Rx
3R
T1 (ESF
Tx
only)
Rx
3M
T1 (ESF
Tx
only)
Rx
Analog Interface
Digital Signaling Bits
A1
B1
A2
B2
On-Hook
0
1
0
1
Off-Hook
1
1
1
1
Ring
1
x
1
x
No-Ring
0
x
0
x
A1
A2
B1
B2
On-Hook
0
0
0
0
Off-Hook
1
1
1
1
Ring
1
1
x
x
No-Ring
0
0
x
x
On-Hook
0
0
1
1
Off-Hook
1
1
1
1
Ring
x
x
0
0
No-Ring
x
x
1
1
On-Hook
0
0
0
0
Off-Hook
1
1
0
0
Ring
1
1
No-Ring
0
0
Reversal Polarity
0
0
No Rev. Polarity
1
1
On-Hook
0
0
1
1
Off-Hook
1
1
1
1
Ring
1
1
No-Ring
0
0
Meter 12/16 kHz
1
1
No Meter
0
0
Signaling Profiles in the ADPCM Mode
B-9
VC-6A Installation and Operation Manual
Appendix B Signaling Profiles
Table B-6. Signaling Profiles for FXO Modules in ADPCM Mode
Profile
1
Digital Interface
E1
Tx
Rx
T1
Tx
Rx
2
T1
Tx
Rx
Profile
3R
Digital Interface
T1 (ESF
Tx
only)
Rx
3M
T1 (ESF
Tx
only)
Rx
B-10
Analog Interface
Digital Signaling Bits
A1
B1
A2
B2
No Ring Detect
0
1
0
1
Ring Detect
1
1
1
1
Rem On-Hook
0
x
0
x
Rem Off-Hook
1
x
1
x
A1
A2
B1
B2
No Ring Detect
0
0
0
0
Ring Detect
1
1
1
1
Rem On-Hook
0
0
x
x
Rem Off-Hook
1
1
x
x
No Ring Detect
0
0
1
1
Ring detect
0
0
0
0
Rem On-Hook
0
0
x
x
Rem Off-Hook
1
1
x
x
Analog Interface
Digital Signaling Bits
A1
A2
B1
B2
No Ring Detect
0
0
Ring Detect
1
1
Reversal Polarity
0
0
No Rev. Polarity
1
1
Rem On-Hook
0
0
x
x
Rem Off-Hook
1
1
x
x
No Ring Detect
0
0
Ring Detect
1
1
Meter 12/16kHz
1
1
No Meter
0
0
Rem On-Hook
0
0
x
x
Rem Off-Hook
1
1
x
x
Signaling Profiles in the ADPCM Mode
VC-6A Installation and Operation Manual
B.4
Appendix B Signaling Profiles
ML-2T1 Signal Profile Translation
This section describes how to configure the signaling profile definition of the
ML-2T1 main link, to enable its operation with VC-6A Profiles 1 or 2. The
translation varies according to the VC-6A interface and encoding method.
To configure the signaling profile definition of the ML-2T1 main link:
1. In the ML-2T1 module configuration parameters, set Sig. Profile parameter to
1 (for details, see the ML-1T1/ML-2T1, MLF-1T1/MLF-2T1 Installation and
Operation Manual.
2. Using the DEF PROFILE 1 command (for details, see Megaplex-2100
Installation and Operation Manual), configure the Rx/Tx Translation of the A,
B, C, and D signaling bits according to Table B-7.
Table B-7. ML-2T1 Signaling Profile Translations for VC-6A Profiles 1 & 2
Interface
E&M
FXS
Encoding
VC-6A Profile
Tx Translation
A
B
C
D
A
B
C
D
PCM
1
A
B
C
D
A
A
A
A
ADPCM
1
A
C
B
D
A
C
A
C
PCM
1
A
B
C
D
A
A
A
A
2
B
A
C
D
A
B
A
B
1
A
C
B
D
A
C
A
C
2
C
A
D
B
A
C
B
D
1
A
B
C
D
A
A
A
A
2
A
B
C
D
B
A
D
A
1
A
C
B
D
A
C
A
C
2
A
C
B
D
B
D
A
C
ADPCM
FXO
Rx Translation
PCM
ADPCM
When the VC-6A module works with ML-2T1 links in other signaling profiles (3R,
3M, 3RM or 4), or with ML-2E1 links in all the profiles (1, 2, 3R, 3M, 3RM, or 4),
the Tx/Rx Translation of the main link module is “transparent”, as defined in
Table B-8 (which is the default definition of Main Link’s Signaling Profile 1):
Table B-8. Main Link’s Signaling Profile 1
Rx Translation
Tx Translation
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
ML-2T1 Signal Profile Translation
B-11
Appendix B Signaling Profiles
B-12
ML-2T1 Signal Profile Translation
VC-6A Installation and Operation Manual
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