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Cisco 12006 and Cisco 12406 Router Installation and Configuration Guide
OL-11497-03
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 DC-DC power supply and
some current-sharing circuitry. Because the alarm card itself is powered by this
supply, the on-board MBus module can report problems with the supply only
when the redundant alarm card is in the chassis and providing MBus power.
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.