Lucent Technologies DDM-2000 OC-3, User & Service Manual

Page: 1964 / 2536

363-206-285 Trouble Clearing:
TAP-107
Issue 2, February 2000 Page 8 of 28
DDM-2000 OC-3 M
ULTIPLEXER
environmentn
CR, MJ,
MN or
None The specified environmental alarm point
(miscellaneous discrete input) is active. Note: The
actual message that appears in the
Active
Alarms and Status Report
for this condition
can be provisioned; this is the default message.
(See the
rtrv-attr-env:
and
set-attr-env:
commands.)
excessive holdover
MJ The system has been in holdover mode for more
than 4 hours. This may cause degraded
performance (high error rates) on the transmitted
and/or received signals. Whenever this condition
exists, the condition
holdover mode active
also exists.
Likely cause: See
holdover mode active
.
ExternalMinor
CR, MJ,
MN or
None The external minor alarm input (environmental
alarm input 15) is active. Typically, this input will
be connected to the power shelf, and will indicate
that the DC power or the cooling fan in a remote
terminal cabinet has failed.
Note: The actual message that appears in the
Active Alarms and Status Report
for this
condition can be provisioned; this is the default
message. (See the
rtrv-attr-env:
and
set-attr-env:
commands.)
fan control relay failed
MN The thermostat on the SYSCTL circuit pack
indicates that the cooling fan should be turned on,
and the fan control relay on the SYSCTL circuit
pack failed to operate. The system will continue to
operate, but it might overheat, leading to degraded
or interrupted transmission and/or circuit pack
failures.
Likely causes: Telemetry input common (TLMIC,
pin 9) on J62 not grounded (adapter plug missing
from J62 on RT shelf when J62 does not have a
cable attached.) SYSCTL circuit pack failure.
fan shelf failed
MN The system has detected a failure of the
DDM-2000 fan shelf. The ED-8C733-30, G7 CO
cooling fan has failed. The system will continue to
operate but it may overheat. The fan must be
repaired within 4 hours of the failure, otherwise
service may be interrupted and/or circuit packs
may fail.
Likely causes: Filter needs replacing, a fan pack
failed, a fan pack has lost one or both power
feeders, or the fan shelf control board has failed.
Table B – RTRV-ALM Message Descriptions (Continued)
Description
Alarm
Level
Meaning