TAP-107
: Trouble Clearing 363-206-305
Page 8 of 22 Issue 3, June 2000
DDM-2000 F
IBER
R
EACH
W
IDEBAND
S
HELF
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 cause:
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 cause:
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
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