1-8
Issue 2.0 April 2000
365-353-255
DACS II Operation and Maintenance Manual
Release 8.2.6 Features
RAI Alarm Suppression Feature
Overview
The Remote Alarm Indicator (RAI) Alarm Suppression feature provides a way of
suppressing the individual DS1/E1 tributary alarms when a DS3 “Yellow Alarm” is
detected by the DS3 HMXR card. These individual alarm messages add no new
information and quite frequently overload the system with redundant messages.
A DS3 failure message is typically sufficient.
With this added functionality, the HMXR
suppresses individual DS1/E1 alarm
messa
es when an
of the followin
DS3 failures are detected
:
■ Loss of Signal (LOS)
■ Loss of Frame (LOF)
■ Excessive Bit Error Rate (BER)
■ Alarm Indication Signal (AIS or IDLE)
■ RAI.
Alarm
Suppression
Operation
When a DS3 failure is detected, the HDS3U will issue the alarm message and an
subsequent idle message for the DS3 itself. DS1/E1 messages (PBA, CGA, and
performance monitoring threshold messages) created as a result of the DS3
failure are always suppressed.
DS1/E1 messages will be issued if a DS1/E1 remains in alarm after the DS3 is
idled and was not in alarm previous to the DS3 going in alarm. In this case, the
DS1/E1 failure most likely is a result of something other than the DS3.
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