Feature Reference
DS1 trunk service
1516
Administrator’s Guide for Avaya Communication Manager
November 2003
Signaling modes
Common-channel signaling (CCS) is an industry-standard technique where any one of a group of
channels carries the signals for the other channels. Avaya uses the 24th channel of a group for signaling.
This signaling technique differs from 24-channel signaling. When the system is configured for
Facility-Associated Signaling, 24-channel signaling uses the 24th channel in a DS1 facility to carry
signals. This technique also is called clear channel, out-of-band, or alternate voice data (AVD) signaling.
Channel Associated Signaling (CAS) is similar to common-channel signaling and is used only when the
Bit Rate is 2.048 Mbps (the trunk is used with an E1 interface). Signaling is carried on the 16th channel.
Common-channel signaling and channel associated signaling provide a maximum transmission rate of 64
Kbps for bearer channels.
Robbed-bit signaling is a per-channel signaling technique for transmitting signaling bits on each channel
in a DS1 facility. The least-significant bit in every 6th transmitted information frame is removed and
replaced by a signaling bit. This technique is also called in-band signaling. The maximum transmission
rate for each bearer channel with robbed-bit signaling is 56 Kbps.
ISDN-PRI signaling is carried on the 24th channel for a 1.544 Mbps connection and on the 16th channel
for a 2.048 Mbps connection.
Public network signaling administration for ISDN-PRI Layer 3
The table below shows Avaya Communication Manager public network access connections for
ISDN-PRI Layer 3.
Admin
value
Country
Protocol supported
B-channel
mtce msg
1 - a
United States,
Canada
AT&T TR 41449/ 41459 (tested with AT&T
network, Canadian network, and MCI network)
Service
1 - b
United States
Bellcore TR 1268;
NIUF.302; ANSI T1.607
Restart
1 - c
United States
NORTEL DMS-250 BCS36/IEC01
Service
1-d
United States
Telecordia SR-4287
Service
2a
Australia
AUSTEL TS014.1;
Telecom Australia TPH 1856 National ISDN
protocol
Restart
2b
Australia
ETSI ISDN protocol
Restart
3
Japan
NTT INS-NET
Restart
4
Italy
ETS 300 102
Restart
5
Netherlands
ETS 300 102
Restart
6
Singapore
ETS 300 102
Restart
7
Mexico
ETS 300 102
Restart
8
Belgium
ETS 300 102
Restart
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