DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Object Repair Procedures
9-148ATM-BCH (ATM B-Channel Trunk)
9
ATM-BCH (ATM B-Channel Trunk)
This maintenance object 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-EI (Expansion
Interface Circuit Pack)’’ maintenance object.
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
Bearer (B) 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 2 service state categories for B-channels as
listed in Table 9-61
.
MO Name (in
Alarm Log) Alarm Level
Initial Command to
Run
1
1. UU is the universal cabinet number (1 for PPN, 2-44 for EPNs). 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
