User Manual

Troubleshooting68P09255A57-2
Aug 2002
SC4812ET Optimization/ATP Manual Software Release R16.1.x.x
PRELIMINARY
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LED Status Combs All Modules (except GLI3, CSM, BBX2, MCC8/24E)
PWR/ALM LED
The following list describes the states of the module status indicator.
 Solid GREEN - module operating in a normal (fault free) condition.
 Solid RED - module is operating in a fault (alarm) condition due to
electrical hardware failure.
Note that a fault (alarm) indication may or may not be due to a complete
module failure and normal service may or may not be reduced or
interrupted.
DC/DC Converter LED Status Combinations
The PWR CNVTR has its own alarm (fault) detection circuitry that
controls the state of the PWR/ALM LED.
PWR/ALM LED
The following list describes the states of the bi-color LED.
 Solid GREEN - module operating in a normal (fault free) condition.
 Solid RED - module is operating in a fault (alarm) condition due to
electrical hardware problem.
CSM LED Status Combinations
PWR/ALM LED
The CSMs include on-board alarm detection. Hardware and
software/firmware alarms are indicated via the front panel indicators.
After the memory tests, the CSM loads OOS-RAM code from the Flash
EPROM, if available. If not available, the OOS-ROM code is loaded
from the Flash EPROM.
 Solid GREEN - module is INS_ACT or INS_STBY no alarm.
 Solid RED - Initial power up or module is operating in a fault (alarm)
condition.
 Slowly Flashing GREEN - OOS_ROM no alarm.
 Long RED/Short GREEN - OOS_ROM alarm.
 Rapidly Flashing GREEN - OOS_RAM no alarm or
INS_ACT in DUMB mode.
 Short RED/Short GREEN - OOS_RAM alarm.
 Long GREEN/Short RED - INS_ACT or INS_STBY alarm.
 Off - no DC power or on-board fuse is open.
 Solid YELLOW - After a reset, the CSMs begin to boot. During
SRAM test and Flash EPROM code check, the LED is yellow. (If
SRAM or Flash EPROM fail, the LED changes to a solid RED and
the CSM attempts to reboot.)
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