TAP-112 : Trouble Clearing 363-206-285
Page 7 of 16 Issue 2, February 2000
DDM-2000 OC-3 MULTIPLEXER
MN LED lighted. inc. STS1 AIS
*
Incomplete or incorrect
cross-connect provisioning in an
end-to-end network; unprotected
removal or failure of DS3,
MXRVO, STS1E,orOLIU CP at
far end; or unprotected optical line
failure.
TAP-120
inc. STS1 sig degrade (BER)
inc. STS1 sig failed (BER)
Failure of OLIU CP at near end or
far end or failure of receive fiber.
TAP-111
(linear, 1+1)
TAP-119
(ring, 0X1)
inc. STS1 unequipped An STS-1 cross-connect has
been deleted in upstream
equipment interfacing with the
DDM-2000 OC-3 ring.
Find the deleted
cross-connect in the
upstream equipment.
inc. VT AIS
*
Incomplete or incorrect
cross-connect provisioning in
end-to-end network; unprotected
removal or failure of DS1/DS1PM
CP at far end.
In ring applications: upstream
OLIU CP or fiber failure affecting
only one ring direction. A VT
yellow alarm message is not
returned for a non-service
affecting VT AIS.
TAP-120
inc. VT LOP Unprotected failure of
DS1/DS1PM or MXRVO CP at
near end or far end.
Replace CP
associated with
alarm.
inc. VT sig degrade (BER) An OLIU CP failure or a fiber
failure at some point on the failed
ring.
TAP-119
inc. VT unequipped An VT1.5 cross-connect has been
deleted in upstream equipment
interfacing with the DDM-2000
OC-3 ring.
Find the deleted
cross-connect in the
upstream equipment.
invalid CP switches When associated with TIMING
slot, timing mode switch settings
on TGS/TG3 CPs are invalid.
Step 34
OC12 connector failed Failure or removal of the OC-12
faceplate connector (ribbon cable)
which carries STS-1/STS-3c ring
pass through traffic on the OC-12
ring interface on the OC-3 shelf.
Reconnect faceplate
connector or replace,
if failed.
See notes/footnotes at the end of this table.
Table A – Minor Alarm Conditions (Continued)
Alarm Level or
LED Indication Trouble Description (Note) Likely causes Step or Procedure
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