Service Manual

GSM-204-323
Alarm module
31st Oct 01
Tech. 6–26
Technical Description: Horizon macro outdoor
CONTROLLED INTRODUCTION
68P02902W02-A
Alarm module
functionality
The alarm module receives inputs from:
 The external alarm connector on the interface panel, (from the CAB and
the alarms interface board).
 Cabinet PSMs (identifying type, manufacturer and slot number).
 Environmental control devices.
 Customer defined alarms.
The alarm board receives these inputs, encodes them, and then passes the
code word to all CTUs in the cabinet via the backplane.
Alarm module
replacement –
effect on alarms
The alarm module can be replaced while the cabinet system is running (hot
replacement). This will temporarily interrupt alarms, with the OMC-R receiving
an additional alarm module out of service alarm, which automatically clears
upon correct insertion of the replacement module.
Alarm collection
from extension
cabinets
Extension cabinet alarms are sent from the extension cabinet alarm module to
the extension cabinet CTUs. The CTUs transmit the alarms to the main cabinet,
by using the normal FMUX connection, for transmission to the MCUF.