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3EM13853AF
Issue 01, September 2007
TAP-118
HLD Alarm
PURPOSE
This procedure provides instructions to clear a HLDOVRSYNC alarm on a TC-SYNC.
GENERAL
A HLDOVRSYNC alarm indicates system timing is in holdover mode.
Holdover mode can occur under the following conditions:
•
During time period between selection of a new reference and stabilization
•
During time period between sync problem and declaring it unavailable
•
When sync reference is unavailable and there is no other reference
For information on TL1 command syntax, refer to the 1677 SONET Link Commands and Messages
manual (PN 3EM13852AF).
STEP
PROCEDURE
Enter
1
Examine output values of PRIREF, SECREF, and CURREFSRC parameters.
2
Was Sync Reference Order recently changed?
3
Wait 5 minutes.
4
Enter
5
Is HLDOVRSYNC alarm still active?
6
Re-evaluate sync sources.
7
Enter
8
HLD Alarm
RTRV-SYNCN;
If yes, go to step 4.
If no, go to step 9.
and
RTRV-ALM-ALL;
RTRV-COND-ALL;
If yes, go to step 7.
If no, go to step 19.
and
RTRV-ALM-ALL;
RTRV-COND-ALL;
TAP-118
4-57
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