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363-206-285
Issue 2, February 2000
Table A – Alarm and Status - NE ACTY (Continued)
Activity
inc. (from fiber) DS3
OOF
inc. EC1 FERF
inc. OC1 FERF
inc. OC3 FERF
inc. OC12 FERF
inc. STS1 yellow
inc. VT yellow
Meaning
The system detects a DS3 out-of-frame condition in DEMUX
direction (coming from fiber) for the specified DS3 signal. This
condition is reported only if the DS3 interface is provisioned is VM
or VMR mode. See set-t3: or rtrv-t3: commands.
Likely causes: An OOF DS3 signal inc. to the DSX-3 at the far
end; or failure of DS3 circuit pack at near or far end; the DS3 signal
is looped at both ends. If no trouble with DSX-3 signal, replace DS3
circuit pack [DLP-523].
The system has detected the EC-1 far end receive failure (FERF)
signal in the incoming EC-1 signal.
Likely causes: The other end has detected an incoming signal
failure on the specified EC-1 line. This may be caused by failure of
the STS1E or 3STS1E circuit pack at the near end, the STS1E or
3STS1E circuit pack at the far end, or the transmit cable on the
specified line. Replace STS1E or 3STS1E circuit pack at near end
and/or far end [DLP-523] or repair EC-1 cable.
The system detects the OC-1 far end receive failure (FERF) signal
in the incoming OC-1 signal.
Likely causes: The far end has detected an incoming signal
failure on the specified OC-1 line. This may be caused by failure of
the OLIU circuit pack at the near end, the OLIU circuit pack at the
far end, or the transmit fiber on the specified line [TAP-119].
The system detects the OC-3 far end receive failure (FERF) signal
in the incoming OC-3 signal.
Likely causes: The far end has detected an incoming signal
failure on the specified OC-3 line. This may be caused by failure of
the OLIU circuit pack at the near end, the OLIU circuit pack at the
far end, or the transmit fiber on the specified line [TAP-111] or
[TAP-119].
The system detects the OC-12 far end receive failure (FERF)
signal in the incoming OC-12 signal.
Likely causes: The far end has detected an incoming signal
failure on the specified OC-12 line. This may be caused by failure
of the OLIU circuit pack at the near end, the OLIU circuit pack at
the far end, or the transmit fiber on the specified line [TAP-111] or
[TAP-119].
The system detects an incoming STS-1 yellow signal inserted by
the far end path terminating equipment.
Likely causes: Incomplete or incorrect cross-connect provisioning
in the end-to-end network [TAP-120], or unprotected unidirectional
failure of the OLIU circuit pack or fiber at some point in the
end-to-end path.
The far end is detecting VT AIS or VT LOP and inserting VT yellow
in its transmit signal.
Likely causes: Unprotected unidirectional failure of a circuit pack
or fiber at some point in the end-to-end path.
DDM-2000 OC-3 M
Trouble Clearing:
ULTIPLEXER
TAP-117
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