363-206-285 Trouble Clearing: TAP-101
Issue 2, February 2000 Page 4 of 10
DDM-2000 OC-3 MULTIPLEXER
CRITICAL. CR
LED lighted.
FAULT LED
flashing on DS3
CP.
inc. (from DSX) DS3 LOS*
inc. (from DSX) DS3 OOF*
inc. (from DSX) DS3 sig fail*
Equipment failed or removed at
DSX-3; DS3 input disconnected
attheDSX-3oratthe
DDM-2000 backplane; an
out-of-frame DS3 signal
incoming to the DSX-3 at the far
end; unprotected failure of DS3
CP at the far end or near end;
DS3 signal looped at both ends.
Step 7
CRITICAL. CR
LED lighted.
FAULT LED
flashing on
STS1E CP.
inc. EC1 LOS*
inc. EC1 LOF*
inc. EC1 sig failed (BER)*
inc. EC1 sig degrade (BER)*
Failure of incoming EC-1 signal
from STSX, failure of STS1E CP
at the near end, failure of
incoming cable or cable
disconnect at EC-1 STSX
cross-connect point or shelf
connector, cross talk in office
wiring,
Step 7
inc. EC1 line AIS* Failure of the STS1E CP or
equivalent at other end of EC-1
line.
Step 25
inc. STS1 LOP EC1* Failure of the near-end or
far-end STS1E CP.
Step 25
CRITICAL.
CR LED lighted.
inc. STS1 AIS* Incomplete or incorrect
cross-connect provisioning in an
end-to-end network; unprotected
removal or obscure failure of a
DS3, STS1E, MXRVO,orOLIU
CP at the far end; unprotected
optical line failure.
TAP-120
inc. VT AIS* Incomplete or incorrect
cross-connect provisioning in an
end-to-end network; unprotected
removal or failure of a DS1 CP at
the far end.
TAP-120
inc. STS1 sig failed (BER)
inc. STS1 sig degrade (BER)
Failure of OLIU CP at near end
or far end or failure of receive
fiber.
TAP-111
(linear, 1+1)
or TAP-119
(ring, 0X1)
invalid CP switches When associated with TIMING
slot, timing mode switch settings
on TGS/TG3 CP are invalid.
Step 14
See notes/footnotes at end of table.
Table A – Critical (CR) Alarm Conditions (Continued)
Alarm Level or
LED Indication Trouble Description (Note) Likely causes
Step or
Procedure
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