Lucent DDM-2000 OC-3 User And Service Manual page 604

TAD-100
:Trouble Clearing 363-206-285
Page 2 of 4 Issue 2, February 2000
RTAC Assistance
The technician must make the decision regarding trouble analysis, corrective action,
and obtaining assistance. The technician or local technical support staff may choose
to continue trouble analysis based on their knowledge or experience on the
DDM-2000 system, or may elect to obtain assistance by calling the Regional
Technical Assistance Center 1-800-225-RTAC.
Circuit Pack Failures
Circuit pack failures are identified by LEDs and reported by system alarms and/or by
manual or automatic diagnostic reports. When this occurs, a determination must be
made as to why a circuit pack has failed. One recommendation as a first step for
determining the cause of a failure is to unseat and then reseat the suspected circuit
pack. For example, if a DS3 circuit pack is reported faulty, that circuit pack should be
unseated and then reseated before being returned as defective. This will cause an
automatic recovery and diagnostic operation to be performed on that DS3 circuit
pack. If there is a contact problem such as dirt, oil, or lack of total contact connection,
then this may be corrected by reseating and thus avoiding the return of a good unit for
repair. Use caution when unseating circuit packs. For example, ensure protection
switching is available for circuit pack being removed.
When circuit packs are replaced in some sequence to clear a trouble, they should be
replaced one at at time by installing the original circuit packs if they were found to be
operational.
DDM-2000 OC-3 M
ULTIPLEXER