Avaya S8700 - ATM-BCH (ATM B-Channel Trunk)

Maintenance-Object Repair Procedures
555-233-143
8-168 Issue 1 May 2002
ATM-BCH (ATM B-Channel Trunk)
This MO explains how you test and repair TN230x ATM Interface circuit packs
(TN2305 and TN2306) that have ATM B-channel trunks administered for ATM
Circuit Emulation Service (CES).
For maintenance instructions for TN230x circuit packs that are administered as
Expansion Interfaces for ATM network connectivity, see the ‘‘ATM-INTF
(TN2305/6)’’ MO.
ATM Circuit Emulation Service
Under ATM Circuit Emulation Service, you simulate ISDN-PRI circuits by
assigning ATM ports to signaling groups. Each signaling group represents a PRI
circuit, and the ports in the group represent the D channel and B channels of that
circuit. B channels must also be assigned to ISDN-PRI trunk groups. TN230x
circuit packs support up to 248 ports per circuit pack.
Signaling Group Components
B (bearer) channels (ATM-BCH) transmit digitized voice or data, while a separate
D channel (ATM-DCH) handles call-control signaling. One D channel handles
signaling for a group of B channels that combine to form a signaling group
(ATM-SGRP).
B-Channel Service States
The ISDN specification defines two service state categories for B channels as
listed in Table 8-67 on page 8-169.
MO’s Name (in
Alarm Log) Alarm Level
Initial Command to
Run
1
1. UU is the universal cabinet number (1–64 for ATM PNC, 1–44 for CSS PNC). C is the carrier designation (A,
B, C, D, or E). SS is the number of the slot where the circuit pack resides (01–21). ppp is the 3-digit port number
(9–256).
Full Name of MO
ATM-BCH
2
2. For additional repair information, see also ‘‘ATM-DCH (ATM D-Channel Port)’’, ‘‘ATM-SGRP (ATM Signaling
Group)’’ and PKT-BUS.
MAJOR
3
3. A MAJOR alarm on a trunk means that alarms on these trunks are not downgraded by the set options
command, and at least 75% of the trunks in this trunk group are alarmed.
test port UUCSSppp l ATM B-Channel Trunk
ATM-BCH MINOR test port UUCSSppp l ATM B-Channel Trunk
ATM-BCH WARNING test port UUCSSppp sh ATM B-Channel Trunk