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Maintenance Object Repair Procedures
555-233-123 10-194 Issue 4 May 2002
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).
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 10-65 on page 10-195 .
MO Name (in
Alarm Log)
Alarm
Level
Initial Command to
Run
1
1 UU is the universal cabinet number (1 for PPN, 2-3 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 (Packet 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