Specifications

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Cisco 12010, Cisco 12410, and Cisco 12810 Router Clock and Scheduler, Switch Fabric, and Alarm Card Replacement Instructions
OL-13810-01
Alarm Card and Alarm Display Overview
Figure 2 Alarm Cards and Alarm Display
The alarm cards and alarm display perform four functions:
• Hardware implementation of the alarm system
• OK/FAIL status indication for the CSCs and SFCs
• Power system monitoring
• Redundant generation of the 5 VDC maintenance bus (MBus) supply voltage for the line cards
The display indicator LEDs, alarm relays, and external alarm relay connectors are located on a separate
card in order to accommodate the mechanical design requirements of the router enclosure. The external
alarm display assembly is mounted on the front of the chassis just above the horizontal
cable-management tray (Figure 3). The alarm display assembly is sometimes referred to as the alarm
display card or alarm display. The power system monitoring functions are located in the alarm card
MBus module.
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PEM2PEM1
Alarm display
Blower module
50397
Line card and
GRP card cage
Switch fabric
and alarm
card cage