Pri Fault Clearing; Contents; Pri Red Alarm (Local Alarm) - Nortel Communication Server 1000S Maintenance Manual

PRI fault clearing

Contents

PRI Red alarm (local alarm)

This section contains information on the following topics:
PRI Red alarm (local alarm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PRI Yellow alarm (remote alarm). . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PRI problems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D-channel problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A PRI local alarm can indicate:
• 1.5 Mb/2.0 Mb digital transmission problems
• a PRI card fault
Under any of these alarm conditions, all 24/30 B-channels are taken out of
service, and:
1 The PRI local alarm faceplate LED is lit.
2 Calls on the PRI are disconnected automatically.
3 All 24/30 B-channels are disabled.
4 After a pause of 2.5 seconds, the PRI sends a remote-alarm indication to
the far-end switch.
5 The appropriate Digital Trunk Diagnostic (DTA) message is printed, and
a minor alarm is raised on all attendant consoles within the same
customer group.
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Maintenance