363-206-305 Trouble Clearing:
Issue 3, June 2000 Page 1 of 6
DDM-2000 F
IBER
R
EACH
N
ARROWBAND
S
HELF
TAD-100
Maintenance Philosophy
GENERAL
The DDM-2000 NBS provides up to 48 POTS or special service circuits, up to
40 ISDN lines, or a combination of both.
ALARMS
The SLC-2000 Server unit (
SPQ
810/811) in the
SLC
-2000 and the DSXBIU in the
NBS provide summary alarms for the NBS. The PCU, RGU, CDTU, and DSXBIU at
the NBS, and the NBS Server at the RT, all have a FAIL indicator that lights when the
circuit pack fails. The
SLC
-2000 Server provides an alarm interface between the
SLC
-2000 Carrier System and the Narrow Band Shelf.
Trouble should be cleared in the
SLC
-2000 carrier system before attempting to clear
NBS system trouble. A
SLC
-2000 trouble may light alarms on other common units
(VTUs, MXRVOs, MDCs, PTUs, etc.) and can be isolated using the user interface
panel (UIP) retrieve-alarms and retrieve-faults commands. Mechanized
loop testing (MLT) tests can determine the status of a channel in the NBS. The test
will return a DC signature that indicates whether the facility link between the
SLC
-2000 and NBS is good or bad and indicates possible trouble on the customer
drop (off hook, foreign voltage on drop, etc.). MLT test access will be denied on any
digroup that has a digroup alarm caused by a carrier system trouble.
The following is a summary of
SLC
-2000 Server and (NBS) DSXBIU faceplate alarm
indicators.
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