Atm-Bch (Atm B-Channel Trunk) - Avaya S8700 Maintenance Manual

For multi-connect configurations

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Maintenance-Object Repair Procedures

ATM-BCH (ATM B-Channel Trunk)

MO's Name (in

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

For additional repair information, see also

and PKT-BUS.

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.

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

(TN2305/6)''

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

B-Channel Service States

The ISDN specification defines two service state categories for B channels as

Table 8-67 on page

Issue 1 May 2002

Initial Command to

test port UUCSSppp l

test port UUCSSppp sh

''ATM-DCH (ATM D-Channel

Full Name of MO

ATM B-Channel Trunk

''ATM-SGRP (ATM Signaling