Cisco Systems XR 12406 manual Monitoring Critical, Major, and Minor Alarm Status

Chapter 4 Troubleshooting the Installation

Troubleshooting the Processor Subsystem

Monitoring Critical, Major, and Minor Alarm Status

The alarm card uses three pairs of alarm status LEDs to identify system alarm conditions detected through the MBus. Those alarm conditions are:

•Critical

•Major

•Minor

Note The alarm status LEDs are paired for redundancy to protect against a single failed LED. If any of the six LEDs is on, check the system console for messages describing the fault.

Because there are two alarm cards in the Cisco XR 12406 router, a system alarm condition detected through the MBus causes the same LEDs to light on both alarm cards.

The alarms can warn of an overtemperature condition on a component in one of the card cages, a fan failure in a blower module, an overcurrent condition in a power supply, or an out-of-tolerance voltage on one of the cards in one of the card cages. The LEDs are driven by MBus software, which sets the threshold levels for triggering the different stages of alarms.

The RP continuously polls the system for temperature, voltage, current, and fan speed values. If an over-threshold value is detected, the RP:

•Sets the appropriate alarm severity level on the alarm card

•Lights one of the LEDs on the alarm display

•Energizes the appropriate alarm display relays

•Activates any external audible or visual alarms wired to the alarm display

•Logs a message about the threshold violation on the system console

	Cisco XR 12406 Router Installation Guide
4-24	OL-13831-01