Alarm Relay Operation; Module Alarm Generation Criteria - Lucent Technologies PacketStar User Manual

Chapter 2 Module Description
Functional Description
Table 2-1. Module Alarm Generation Criteria
This Alarm occurs... Under the following conditions...
CRITICAL
MAJOR
MINOR

Alarm Relay Operation

®
PSAX 4500 Alarm Module User Guide, Issue 1
PacketStar
2-4
• Loss of input power to the chassis—all module LEDs do not illuminate but
a Critical alarm is generated when the alarm relay becomes unpowered
and causes the relay contacts to change position
• Failure of both CPUn modules
• Loss or Failure of both Stratum 3–4 modules
• Loss of both BITS clocks
• Loss of both Composite clocks
• Loss of both primary and secondary I/O timing references (if provisioned)
• Failure of one -48 V dc Power Supply module (including fan)
• Loss of one BITS or Composite clock timing reference source
• Failure of one Stratum 3–4 module in a redundant configuration
• Failure of one CPUn module in a redundant configuration
• Failure of one configured module
• Loss of signal or frame from a primary or secondary timing source when
line timing is configured on the Stratum 3–4 module
When more than one of the above conditions occurs in more than one
category, the highest severity alarm determines which LED illuminates.
Note:
For the Alarm and PSAX 4500 Alarm modules, output contact clo-
sures are not supported for a non-redundant Stratum 3–4 module
configuration as this results in a permanent Minor alarm.
The activation of the external alarms in the CO is controlled through six
relays (three for visible alarms and three for audible alarms) with Form 1-C
contacts (see Figure 2-3). The contacts—normally open (NO), normally
closed (NC), and common (COM)—are accessible through the
nector.
ALARM con-
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