Lucent DDM-2000 OC-3 User And Service Manual page 693

TAP-112
: Trouble Clearing
Page 7 of 16
Table A – Minor Alarm Conditions (Continued)
Alarm Level or
LED Indication Trouble Description (Note)
MN LED lighted.
inc. STS1 AIS
inc. STS1 sig degrade (BER)
inc. STS1 sig failed (BER)
inc. STS1 unequipped
inc. VT AIS
inc. VT LOP
inc. VT sig degrade (BER)
inc. VT unequipped
invalid CP switches
OC12 connector failed
See notes/footnotes at the end of this table.
*
*
DDM-2000 OC-3 M
Issue 2, February 2000
Likely causes
Incomplete or incorrect
cross-connect provisioning in an
end-to-end network; unprotected
removal or failure of DS3,
MXRVO, STS1E, or OLIU CP at
far end; or unprotected optical line
failure.
Failure of OLIU CP at near end or
far end or failure of receive fiber.
An STS-1 cross-connect has
been deleted in upstream
equipment interfacing with the
DDM-2000 OC-3 ring.
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.
Unprotected failure of
DS1/DS1PM or MXRVO CP at
near end or far end.
An OLIU CP failure or a fiber
failure at some point on the failed
ring.
An VT1.5 cross-connect has been
deleted in upstream equipment
interfacing with the DDM-2000
OC-3 ring.
When associated with TIMING
slot, timing mode switch settings
on TGS/TG3 CPs are invalid.
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.
ULTIPLEXER
363-206-285
Step or Procedure
TAP-120
TAP-111
(linear, 1+1)
TAP-119
(ring, 0X1)
Find the deleted
cross-connect in the
upstream equipment.
TAP-120
Replace CP
associated with
alarm.
TAP-119
Find the deleted
cross-connect in the
upstream equipment.
Step 34
Reconnect faceplate
connector or replace,
if failed.