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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
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
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)’’
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
Summary of Contents for S8700 Series
Page 50: ...Maintenance Architecture 555 233 143 1 26 Issue 1 May 2002 ...
Page 74: ...Initialization and Recovery 555 233 143 3 12 Issue 1 May 2002 ...
Page 186: ...Alarms Errors and Troubleshooting 555 233 143 4 112 Issue 1 May 2002 ...
Page 232: ...Additional Maintenance Procedures 555 233 143 5 46 Issue 1 May 2002 ...
Page 635: ...status psa Issue 1 May 2002 7 379 555 233 143 status psa See status tti on page 7 406 ...
Page 722: ...Maintenance Commands 555 233 143 7 466 Issue 1 May 2002 ...