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363-206-285
Issue 2, February 2000
Table B – RTRV-ALM Message Descriptions (Continued)
Description
inc. OC12 LOF
inc. OC12 LOS
inc. OC12 line AIS
inc. OC12 sig degrade (BER)
inc. OC12 sig failed (BER)
inc. STS1 AIS
Alarm
Level
CR or MN The system has detected a loss-of-frame (LOF)
CR or MN The system has detected loss-of-signal (LOS)
CR, MJ,
MN, or
None
CR or MN
CR or MN The bit error ratio (BER) in the specified OC-12
CR, MJ,
MN, or
None
DDM-2000 OC-3 M
Trouble Clearing:
Meaning
condition in an incoming OC-12 signal. LOF is
defined as an out-of-frame (OOF) condition (five
consecutive errored STS-1 framing patterns) that
lasts for at least 3 milliseconds.
Likely causes: Failure of the OLIU circuit pack at
the near end, failure of the OLIU circuit pack at the
far end, or failure of the receive fiber.
condition on the OC-12 line.
Likely causes: Failure of the OLIU circuit pack at
near end, failure of the OLIU circuit pack at far end,
or failure of the receive fiber.
The system has detected OC-12 line alarm
indication signal (AIS) on an incoming OC-12 line.
Likely cause: Failure of an OLIU circuit pack at the
far end.
The bit error ratio (BER) in the specified OC-12
line exceeds the provisioned soft error threshold
–9
–5
(10
to 10
) but below the hard error threshold of
–3
10
.
Likely causes: Failure of the OLIU circuit pack at
the near end, failure of the OLIU circuit pack at the
far end, failure of the receive fiber, or incorrect
setting of the optical power switch on the OLIU
circuit pack.
–3
signal exceeds 10
.
Likely causes: Failure of the OLIU circuit pack at
the near end, failure of the OLIU circuit pack at the
far end, or failure of the receive fiber.
The system has detected an incoming STS-1 alarm
indication signal (AIS) in the active OC-3, OC-12,
or OC-1 line. The system responds by transmitting
DS1 or DS3 AIS toward the DSX and transmitting
STS-1 yellow toward the fiber from which the AIS is
being received.
Likely causes: Incomplete or incorrect
cross-connect provisioning in an end-to-end
network. Unprotected removal or failure of a DS3,
MXRVO, or OLIU circuit pack at the far end, or
unprotected optical line failure.
ULTIPLEXER
TAP-107
Page 20 of 28
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