Router Installation Guide

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Cisco XR 12406 Router Installation Guide

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Chapter 1 Cisco XR 12406 Router Overview

Line Cards

Figure 1-5 Alarm Card Features

Note The Cisco XR 12406 Router must be populated with two alarm cards, to meet

EMI standards.

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 route processor.

When a signal is received from the route processor, 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 XR 12000 series router have both audible and visible

alarm indicators. The alarm card for the Cisco XR 12406 Router provides only

visible alarm indicators as local alerts to unusual conditions in the router.

1 MBus status LED 5 Major alarm LED

2 CSC status LEDs (two) 6 Minor alarm LED

3 SFC status LEDs (three) – Alarm relay contact connector

4 Critical alarm LED —

MBUS

CSC

ENABLED

FAIL

ALARM

SFC

CRITICAL

MAJOR

MINOR

01 1 2

1 432 5 6

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