Lucent Technologies DDM-2000 OC-3

363-206-285 Trouble Clearing: TAP-107
Issue 2, February 2000 Page 18 of 28
DDM-2000 OC-3 MULTIPLEXER
inc. OC1 FERF NE ACTY The system has detected 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 cable on the specified line.
inc. OC1 line AIS CR or NE
ACTY
The system has detected the OC-1 line alarm
indication signal (AIS) on an incoming OC-1 line.
Likely cause: Failure of an OLIU circuitpackatthe
far end.
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 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.
inc. OC1 sig failed (BER) CR or MN The bit error ratio (BER) in the received OC-1
signal exceeds 10
–3
.
Likely causes: 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 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.
Table B – RTRV-ALM Message Descriptions (Continued)
Description
Alarm
Level Meaning