Nortel DMS-100 Series Maintenance Manual page 82

Remote line concentrating module

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Table of Contents

1-66 Maintenance overview

Faults that occur on a BIC drawer can affect call processing. The unit that is

in service and controls that drawer does not determine if the faults affect call

processing. Because the full in-service tests use the DCC, determine if the

fault is not in the DCC, when takeover must occur. If takeover occurs as a

result of a reported drawer fault, the DCC is at fault even though the LCM

fails the BIC tests.

In the takeover mode, the inactive unit DCC cannot access drawers for call

processing. The inactive unit DCC can access drawers for testing. The

active LCM unit continues to have access to drawers through the DCC of the

Valid drawer faults do not take an LCM unit out-of-service. The status of

the unit is ISTb. The ISTb reason is Self Test or Diag Fail. The test that

297–8351–550 Standard 04.01 August 1999

RINGING_FAIL

BIC_INHIBIT_TEST

RTTS_CM_TEST

BIC_LOOPAROUND

SANITY_TIMEOUT_FAIL

BIC_SCAN_TEST

SET_MSG_LOOPAROUND

SUBCYCLE_LENGTH_FAIL

DS1_LOOPAROUND

SUBCYCLE_ORDER_FAIL

WRITE_PROTECT_FAIL

ZERO_CROSSING_INT_FAST_FAIL

LCC_LOOPAROUND

ZERO_CROSSING_INT_SLOW_FAIL

Troubleshooting