TAP-102
: Trouble Clearing 363-206-305
Page 6 of 14 Issue 3, June 2000
DDM-2000 F
IBER
R
EACH
W
IDEBAND
S
HELF
MAJOR.
MJ
LED
lighted.
excessive
holdover
The system was manually switched
to holdover mode (with the
switch-sync
command) and the
switch has not been reset. The
system automatically switched to
holdover mode due to failure of the
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
loop-timed operation and the
optical line of
OLIU
circuit
pack 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 have failed) and
resetting synchronization mode
protection switch with the
switch-sync:s=mode
,
pri=reset
command. In a
central office system.
MAJOR.
MJ
LED
lighted.
Flashing
FAULT
LED
on
SYSCTL
.
section DCC
channel failed
SYSCTL
or
OHCTL
failure, reset, or
initialization at far end. Program
installation in progress or failed at far
end.
SYSCTL
or
OLIU
failed at near
end.
OLIU
or fiber failure between
this node and node connected to the
source address (no communication
with other end).
Step 13
Table A – Major (MJ) Alarm Conditions (Continued)
Alarm Level
or LED
Indication
Trouble Description
(Note) Likely Causes Step or Procedure
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