Co Alarm Interface - Cisco ASR 5500 Installation Manual

▀ CO Alarm Interface

CO Alarm Interface
The Central Office (CO) Alarm interface on the SSC is a DB15 female connector that supports three low voltage,
normally-closed/normally-open dry-contact relays (see Figure 7-1). These Form C relays interface with an CO alarm
monitor panel to trigger external audio and/or visual indicators.
Three alarm levels are supported by the relays:
 Minor Alarm – This alarm is triggered when a high temperature is detected on a card, causing the fan tray to
switch the fans to high speed.
 Major Alarm – This alarm is triggered when there is a:
 Hardware failure that causes the card to be placed in an off-line state
 PFU failure or removal from the chassis
 Failure of one or more fans on any of the upper or lower fan tray units
 Fan tray failure or any fan tray unit is removed from the chassis
 Critical Alarm – This alarm is triggered when a degradation in service is detected. For example, if the system is
supporting a large number of subscribers and DPCs are removed, the amount of available CPU and memory
resources available for use are reduced.
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SSC Alarm Cabling