Chapter1 Cisco XR 12406 Router Overview
Line Cards
1-14
CiscoXR 12406 Router Installation Guide
OL-13831-01
The IOS XR software running on the route processor determines whet her 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. T he 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.
Power Source Monitoring
The alarm card monitors the power modules and signals when there is a condition
outside the normal range of operation. It discloses problems such as the following:
•Power source voltage is not being provided to a component
•A fault exists in the power source or power module
•Output voltage—Voltage monitor signal is outside the allowable range
•Output current—Current monitor signal is outside the allowable range