TAP-107
: Trouble Clearing 363-206-305
Page 16 of 22 Issue 3, June 2000
DDM-2000 F
IBER
R
EACH
W
IDEBAND
S
HELF
inc. STS1 LOP OC12
slotaid
CR or MN The system has detected a loss-of-pointer (LOP)
condition. A valid STS-1 pointer could not be found
for eight consecutive frames in the identified STS-1
signal.
Likely cause:
If this condition occurs on the STS-1
on both OC-12 lines, the likely cause is an
unprotected failure of an
MXRVO
or a
DS3
circuit
pack at the far end. If this condition occurs on only
one OC-12 line, the likely cause is failure of the
OLIU
circuit pack at the near end or far end.
inc. STS1 sig degrade (BER) CR or MN For STS-1 path ring applications, the bit error ratio
(BER) of the specified STS-1 signal exceeds the
user-provisioned signal degrade threshold.
Likely cause:
Failure at a fiber or failure of an
OLIU
circuit pack at some point in the STS-1 path.
inc. STS1 sig failed (BER) CR or MN For ring applications, the bit error ratio (BER) of the
specified STS-1 signal exceeds the signal fail
threshold (10
–6
). For VT1.5 path-switched rings,
the system responds by inserting VT path AIS in
each pass-through VT contained in the STS-1.
Locally, the system will select the VTs from the
STS-1 on the other ring, as appropriate.
Likely cause:
Failure of the near end
OLIU
circuit
pack reporting the STS-1 failure, failure of the far
end
OLIU
circuit pack, or failure of the receive fiber
if the OC-3/OC-12 is also reporting a failure.
inc. STS1 unequipped CR or MN The system has detected the unequipped code
(SONET path overhead signal code label byte=0)
on an in-service STS-1 channel.
Likely cause:
An upstream STS-1 cross-connect
has been deleted.
inc. STS1 yellow NE ACTY The system has detected an incoming STS-1
yellow signal, which indicates that the far end is
receiving STS-1 AIS on the active OC-3/OC-12
line. The system responds to the STS-1 yellow
signal by transmitting DS1 or DS3 yellow toward
the DSX.
Likely cause:
Incomplete or incorrect
cross-connect provisioning in end-to-end network,
unprotected unidirectional failure of the
OLIU
circuit pack, or fiber at some point in the end-to-end
path.
Table B – RTRV-ALM Message Descriptions (Continued)
Description
Alarm
Level Meaning
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