Lucent DDM-2000 OC-3 User And Service Manual page 656

363-206-285
Issue 2, February 2000
Table B – RTRV-ALM Message Descriptions (Continued)
Description
inc. (from DSX) DS3 OOF
inc. (from fiber) DS3 OOF
inc. (from DSX) DS3 sig fail
inc. EC1 FERF
inc. EC1 LOF
Alarm
Level
CR, MJ,
MN, or
None
NE ACTY
CR
NE ACTY
CR, MJ
MN, or
None
DDM-2000 OC-3 M
Trouble Clearing:
Meaning
The system has detected a DS3 out-of-frame
(OOF) condition in the MUX direction (that is,
coming from the DSX) for the specified DS3 signal.
This condition is reported only if the DS3 interface
is provisioned in VM or VMR mode. (See the
set-t3: and rtrv-t3: commands.)
Likely causes: An out-of-frame DS3 signal
incoming to the DSX-3 at the near end, failure of
the DS3 circuit pack at the near end, or the DS3
signal is looped at both ends.
The system has detected a DS3 out-of-frame
(OOF) condition in the DEMUX direction (that is,
coming from the fiber) for the specified DS3 signal.
This condition is reported only if the DS3 interface
is provisioned in VM or VMR mode. (See the
set-t3: and rtrv-t3: commands.)
Likely causes: An out-of-frame DS3 signal
incoming to the DSX-3 at the far end, failure of the
DS3 circuit pack at the far end or near end, or the
DS3 signal is looped at both ends.
The bit error ratio (BER) in the incoming DS3 signal
exceeds the provisioned failure threshold, 10
–6
10 .
Likely causes: Failure of the upstream equipment
or facility (towards the DSX-3), cross-talk in office
wiring, or unprotected failure of DS3 circuit pack.
The system has detected the EC-1 far end receive
failure (FERF) signal in the incoming EC-1 signal.
Likely causes: The far end has detected an
incoming signal failure on the specified EC-1 line.
This may be caused by failure of the STS1E circuit
pack at the near end, the STS1E circuit pack at the
far end, or the transmit cable on the specified line.
The system has detected a loss-of-frame (LOF)
condition in an incoming EC-1 signal. LOF is
defined as an out of frame (OOF) condition (five
consecutive errored STS-1 framing patterns) that
lasts for at least three milliseconds.
Likely cause: Failure of the STS1E or equivalent
circuit pack at the far end, failure of the STS1E or
equivalent circuit pack at the near end, failure of
the incoming cable, or a cable disconnect at the
STSX-1 or shelf connector.
ULTIPLEXER
TAP-107
Page 12 of 28
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