Lucent DDM-2000 OC-3 User And Service Manual page 691

TAP-112
: Trouble Clearing
Page 5 of 16
Table A – Minor Alarm Conditions (Continued)
Alarm Level or
LED Indication Trouble Description (Note)
MN LED lighted.
fan shelf failed
LEDs lighted on
fan shelf
MN LED lighted.
illegal CP type
FAULT LED
lighted on circuit
pack.
MN LED lighted.
inc. (from DSX) DS1 LOS
FAULT LED
inc. (from DSX) DS1 sig
flashing on DS1
fail
or T1EXT CP
MN LED lighted.
inc. DS1 sync. ref. LOS
FAULT LED
inc. DS1 sync. ref. LOF
flashing on
inc. DS1 sync. ref. BER
TGS/TG3 CP
inc. DS1 sync. ref. AIS
inc. DS1 sync. ref. OOL
inc. DS1 sync. ref. EOOF
inc. DS1 sync. ref. OOL
MN LED lighted.
inc. (from DSX) DS3 LOS
FAULT LED
inc. (from DSX) DS3 sig.
flashing on DS3
fail
CP
MN LED lighted.
inc. OC1 loss of signal
FAULT LED
(LOS)
flashing on OLIU
inc. OC1 LOF
CP
inc. OC1 sig degrade (BER)
inc. OC1 sig failed (BER)
inc. STS1 LOP OC1 slotaid
See notes/footnotes at the end of this table.
†
†
*
*
DDM-2000 OC-3 M
Issue 2, February 2000
Likely causes
Fan filter needs replacing. Fan
pack failed. Fan shelf control
board failed. Fan power feeder
failed.
The fan must be repaired within 4
hours, otherwise service
interruption may occur.
An illegal or unknown circuit pack
type has been inserted into the
shelf.
Equipment failed or removed at
DSX-1
Failure of incoming sync. ref.
signal. TGS/TG3 CP provisioned
for wrong frame format (SF or
ESF).
Equipment failed or removed at
DSX-3
Failure of OLIU CP at near or far
end, or failure of receive fiber.
If failure on both OC-1 lines:
unprotected removal or failure of
MXRVO or DS3 CP at far end.
If failure on only one OC-1 line:
Failure of OLIU CP at near or far
end.
ULTIPLEXER
363-206-285
Step or Procedure
TAP-118
Remove CP and
install correct CP.
Step 13
Step 17
Step 15
TAP-119
(ring, 0X1)
Step 38
TAP-119
(ring, 0X1)