363-206-305 Trouble Clearing:
TAP-107
Issue 3, June 2000 Page 13 of 22
DDM-2000 F
IBER
R
EACH
W
IDEBAND
S
HELF
inc. OC1 LOF CR or MN The system has detected a loss-of-frame (LOF)
condition in an incoming OC-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
OLIU
or equivalent
circuit pack at the far end, failure of the
OLIU
or
equivalent circuit pack at the near end, or failure of
the receive fiber.
inc. OC1 LOS CR or MN The system has detected loss of signal (LOS)
condition on the OC-1 line.
Likely cause:
Failure of the
OLIU
or equivalent
circuit pack at far end, failure of the receive fiber, or
failure of the
OLIU
circuit pack at the near end.
inc. OC1 sig degrade (BER) CR or MN The bit error ratio (BER) in the specified OC-1 line
exceeds the provisioned soft error threshold (10
–9
to 10
–5
) but below the hard error threshold of 10
–3
Likely cause:
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.
inc. OC1 sig failed (BER) CR or MN The bit error ratio (BER) in the received OC-1
signal exceeds 10
–3
.
Likely cause:
Failure of the
OLIU
circuit pack at
the near end, failure of the receive fiber, or failure
of the
OLIU
circuit pack at the far end.
inc. OC3 FERF NE ACTY The system has detected the OC-3 far end receive
failure (FERF) signal in the incoming OC-3 signal.
Likely cause:
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.
inc. OC3 LOF CR or MN The system has detected a loss-of-frame (LOF)
condition in an incoming OC-3 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 cause:
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.
inc. OC3 LOS CR or MN The system has detected loss-of-signal (LOS)
condition on the OC-3 line.
Likely cause:
Failure of the
OLIU
circuit pack at
near end, failure of the
OLIU
circuit pack at far end,
or failure of the receive fiber.
Table B – RTRV-ALM Message Descriptions (Continued)
Description
Alarm
Level Meaning
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