Nortel DMS-100 Series Maintenance Manual page 135

SMC scan audit
When a scan (SC) point detects a fault, a bit is raised in the SMC memory. The
SMC software scans all the scan point bits, measures the temperature, and tests
the batteries. When a change is detected, an alarm is reported to the CM. The
SMC determines when it is necessary to activate an SD point.
Temperature control
There are three temperature sensors in the Star Remote Module Outside
(SRMO) cabinet. The sensors are at the top and bottom of the cabinet and in
the battery compartment. A fourth temperature sensor is in the battery
compartment and connected to the rectifier to regulate its output voltage. This
fourth sensor is not scanned by the SMC card.
Every 5 minutes, the SMC monitors the temperature detected by the first three
temperature sensors. The fans or the heater is activated depending on the
requirement determined by the measured voltage. These components are
activated as follows:
• the two fans are activated to cool the air in the cabinet when the
temperature exceeds 50° C. When the cabinet temperature decreases to
30°C, the fans are deactivated.
• the right fan is activated to circulate warm air generated by the electronic
components when the temperature falls below -10° C
• the heater is activated when the temperature in the battery compartment is
below 0° C. The heater is deactivated when the temperature is above 5° C.
Fan test
The SMC card check fan operation during power up. If a fan operation failure
occurs, the FAN0 or FAN1 alarm is output. The FANSTAT alarm is output if
a fault is detected during normal fan operation.
Star Remote System automatic maintenance 4-35
DMS-100 Family NA100 Star Remote System XPM15 and up