Table of Contents
Advertisement
363-206-285
Issue 2, February 2000
Table B – RTRV-ALM Message Descriptions (Continued)
Description
inc. OC1 FERF
inc. OC1 line AIS
inc. OC1 LOF
inc. OC1 LOS
inc. OC1 sig degrade (BER)
inc. OC1 sig failed (BER)
inc. OC3 FERF
Alarm
Level
NE ACTY
CR or NE
ACTY
CR or MN The system has detected a loss-of-frame (LOF)
CR or MN The system has detected loss of signal (LOS)
CR or MN The bit error ratio (BER) in the specified OC-1 line
CR or MN The bit error ratio (BER) in the received OC-1
NE ACTY
DDM-2000 OC-3 M
Trouble Clearing:
Meaning
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.
The system has detected the OC-1 line alarm
indication signal (AIS) on an incoming OC-1 line.
Likely cause: Failure of an OLIU circuit pack at the
far end.
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.
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.
exceeds the provisioned soft error threshold (10
–5
to 10
) but below the hard error threshold of 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.
–3
signal exceeds 10
.
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.
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.
ULTIPLEXER
TAP-107
Page 18 of 28
–9
–3
Hide quick links:
Advertisement
Table of Contents
