Chapter 1 Product Overview
Line Cards
Alarm Output Function
The alarm output function consists of a group of relays, LEDs, and their associated drivers connected to an output port on the MBus module.
The alarm output function is controlled by the software on the RP. When a signal is received from the RP, the MBus module on the alarm card activates specific relays to signal an alarm condition. There are three alarm condition severity levels: critical, major, and minor. The critical, major, and minor LEDs are paired for redundancy to protect against a single failed LED.
Note Alarm cards for some Cisco 12000 series routers have both audible and visible alarm indicators. The alarm card for the Cisco 12006 and Cisco 12406 routers provides only visible alarm indicators as local alerts to unusual conditions in the router.
The IOS software running on the RP determines whether a given alarm condition is a critical, major, or minor alarm. Typing the show commands sh gsr table and sh env all will give you the table of limits and current readings for the LEDs.
Clock and Scheduler Card and Switch Fabric Card Status
The alarm card provides OK and FAIL indications for all clock and scheduler cards and switch fabric cards in the system. Redundant signals from the fabric cards are brought out to the LEDs on each alarm card. The alarm card does not control how these LEDs are used.
The MBus auxiliary power supply consists of a 50W
Alarm Card Status
The ENABLED/FAIL pair of LEDs labeled MBUS indicate the status of the alarm card. The green ENABLED LED indicates that the MBus module on the alarm card is operating properly. The yellow FAIL LED indicates that the alarm card has detected an error in itself or with the MBus power supply.
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