TAP-101 : Trouble Clearing 363-206-285
Page 3 of 10 Issue 2, February 2000
DDM-2000 OC-3 MULTIPLEXER
TableA–Critical(CR)AlarmConditions
Alarm Level or
LED Indication Trouble Description (Note) Likely causes
Step or
Procedure
CRITICAL. CR
LED lighted.
FAULT LED
flashing on
OLIU CP(s).
inc. OC3 LOS
inc. OC3 LOF
inc. OC3 sig failed (BER)
inc. OC3 sig degrade (BER)
Failure of OLIU CP at near or far
end, or failure of receive fiber.
TAP-111
(linear, 1+1)
or TAP-119
(ring, 0X1)
inc. STS1 LOP OC3 slotaid If failure on both OC-3 lines:
unprotected removal or failure of
MXRVO or DS3 CP at far end.
Step 21
If failure on only one OC-3 line:
Failure of OLIU CP at near or far
end.
TAP-111
(linear, 1+1)
or TAP-119
(ring, 0X1)
inc. OC12 LOS
inc. OC12 LOF
inc. OC12 sig failed (BER)
inc. OC12 sig degrade (BER)
Failure of OLIU CP at near or far
end, or failure of receive fiber.
TAP-119
(ring, 0X1)
inc. STS1 LOP OC12 slotaid If failure on both OC-12 lines:
unprotected removal or failure of
MXRVO or DS3 CP at far end.
Step 21
If failure on only one OC-12 line:
Failure of OLIU CP at near or far
end.
TAP-119
(ring, 0X1)
inc. OC1 LOS
inc. OC1 LOF
inc. OC1 sig failed (BER)
inc. OC1 sig degrade (BER)
Failure of OLIU CP at near or far
end, or failure of receive fiber.
TAP-119
(ring, 0X1)
inc. STS1 LOP OC1 slotaid If failure on both OC-1 lines:
unprotected removal or failure of
MXRVO or OLIU CP
Step 21
If failure on only one OC-1 line:
Failure of OLIU CP at near or far
end.
TAP-119
(ring, 0X1)
CRITICAL.
CR LED lighted.
inc. OC3 line AIS
*
inc. OC12 line AIS
*
inc. OC1 line AIS
Failure of OLIU CP at the far
end.
Step 27
See notes/footnotes at end of table.
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