TAP-120: Trouble Clearing 363-206-285
Page 1 of 4 Issue 2, February 2000
DDM-2000 OC-3 MULTIPLEXER
Clear STS/VT AIS Alarm Conditions
1.
NOTE:
Incoming VT and/or STS1 AIS often indicates missing or incorrect
cross-connects. In linear extension configurations these are reported in
the alarm and status report and the history report with an alarm level of
ne-acty. In ring configurations they may have an alarm level of
ne-acty, MJ or CR. Incoming STS1 AIS may also indicate an
unprotected failure or removal of a DS3, MXRVO, STS1E or OLIU at the
far end associated with the Source Address of the alarm message.
Incoming VT AIS may indicate an unprotected failure or removal of a DS1
or OLIU failures in ring applications.
NOTE:
VT and STS1 AIS conditions are only reported at service termination
(drop) points. Incoming VT and/or STS AIS reported as ne-acty at a
shelf where the service is cross-connected to a DS1, DS3 or EC1 drop
can be caused by missing or incorrect cross-connections at the other
terminal shelf or at any shelves where the service should be
pass-through cross-connected.
NOTE:
An STS1 may contain only one VT, when dropped causes an inc. STS1
AIS since it is the only one connected in the STS1.
Does the alarm and status report indicate incoming VT AIS or STS1 AIS
(inc. VT AIS or inc. STS1 AIS)?
If STS1 AIS, then continue with Step 2.
If VT AIS, then proceed to Step 12.
2. Note the Source Address of the STS1 AIS condition reported in the alarm
and status report (for example, m-1). Based on the circuit layout or other
office records, determine the other shelf where that time slot is supposed to be
terminated (cross-connected to a DS1, DS3 or EC-1 termination).
3. Use the rlgn command, if possible, or have the central maintenance center
login to the other terminating shelf, then use the rtrv-crs-sts1: command
to determine if the time slot identified in Step 2 is cross-connected as specified
in circuit layout or other office records.
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