TAP-117
: Trouble Clearing 363-206-305
Page 4 of 4 Issue 3, June 2000
DDM-2000 F
IBER
R
EACH
W
IDEBAND
S
HELF
inc. OC1 FERF 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-111
].
inc. OC3 FERF 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
].
inc. OC12 FERF 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
].
inc. OC1 line AIS System has detected OC-1 line alarm indication (AIS) signal on an
incoming OC-1 line.
Likely cause:
Failure of
OLIU
circuit pack at far end
[
TAP-111
].
inc. STS1 yellow 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-111
], or
unprotected unidirectional failure of the
OLIU
circuit pack or fiber at some
point in the end-to-end path.
inc. VT yellow 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.
Table A – Alarm and Status — NE ACTY (Continued)
Activity Meaning
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