363-206-305 Trouble Clearing:
TAP-117
Issue 3, June 2000 Page 3 of 4
DDM-2000 F
IBER
R
EACH
W
IDEBAND
S
HELF
Table A – Alarm and Status — NE ACTY
Activity Meaning
holdover mode active System is in holdover synchronization mode.
Likely causes:
A. Manual switch to holdover mode (with the
switch-sync
command)
and the switch has not been reset.
B. Automatic switch to holdover mode due to failure of timing references
as follows:
a. The reference failures have not cleared.
b. The system is provisioned for nonrevertive synchronization
mode switching.
c. The system is provisioned for line-timed operation and the
optical line or OLIU CP has failed, or a message indicating an
upstream clock problem has been received on the sync
message bits of the optical line. (See the
rtrv-sync
command).
d. The system is provisioned for sync message signaling, but the
upstream system from which it line times has not been
provisioned for sync message signaling. The condition can be
cleared by provisioning both systems the same. (See the
set-sync
and
rtrv-sync
commands.)
The condition can be cleared by repairing at least one of the
timing references (if both are failed) and resetting
synchronization mode protection switch with the command
switch-sync:s=mode,pri=reset
.
inc. (from fiber)
DS3 AIS
The system has detected DS3 AIS in the DEMUX direction (coming from
the fiber) for the specified DS3 signal.
Likely causes:
The incoming DS3
signal at the far end has failed, DS3 AIS is received from the DSX-3 at the
far end, or incomplete or missing STS-1 (DS3) cross-connections at a far
end terminal. Check incoming DS3 signal at far end and/or look for
missing cross-connections [
TAP-118
].
inc. (from fiber)
DS3 OOF
The system detects a DS3 out-of-frame condition in DEMUX direction
(coming from fiber) for the specified DS3 signal. This condition is reported
only if the DS3 interface is provisioned is VM or VMR mode. See
set-t3
or
rtrv-t3
commands.
Likely causes:
An OOF DS3 signal incoming to
the DSX-3 at the far end; or failure of
DS3
circuit pack at near or far end;
the DS3 signal is looped at both ends. If no trouble with DSX-3 signal,
replace
DS3
circuit pack [
DLP-523
].
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