Service Manual

GSM-204-323
Control and alarm board (CAB)
31st Oct 01
Tech. 4–20
Technical Description: Horizon macro outdoor
CONTROLLED INTRODUCTION
68P02902W02-A
CAB alarm
functions
The CAB generates or processes the following alarms:
 Over temperature alarms:
– Power supply enclosure over temperature.
– TMS over temperature.
– TMS 2 over temperature (not used).
– Auxiliary equipment housing over temperature.
 Power supply alarms:
– TOPSM dc output fail.
– Mains input fail.
– Low voltage disconnect imminent.
 TMS fail alarms:
– TMS fail.
– TMS 2 fail (not used).
 Smoke alarms:
– Optional smoke detector.
– Optional auxiliary equipment housing smoke detector.
 Door open alarms:
– BTS cabinet door open.
– Auxiliary equipment housing door open.
Except for TOPSM dc output fail, the alarms originate at sensors which use
voltage-free contacts to indicate an alarm by going open contact.
The CAB sends the alarms through the alarms interface board and the interface
panel as external alarms to the digital alarm module. All alarms to this module
indicate an alarm by going open-circuit. The alarms are processed by the alarm
module and MCUF, and sent on to the OMC-R via the BSC.
Auxiliary equipment housing alarms can be inhibited using the SW2 DIP
switches mounted on the CAB pcb.
Over temperature alarms
The operation of the over temperature alarms associated with the CAB is
described in Horizon
macro outdoor temperature control.
Power supply alarms
The TOPSM dc output fail and mains input fail alarm signals are generated by a
single changeover relay within each TOPSM.
 A single TOPSM alarm signal is interpreted by the CAB as a TOPSM dc
output fail.
 A fail signal from all installed TOPSMs is interpreted by the CAB as an ac
supply input fail.