Cisco Systems XR 12406 manual Using the System LEDs to Troubleshoot

Chapter 4 Troubleshooting the Installation

Identifying Startup Problems

Using the System LEDs to Troubleshoot

You can determine when and where the system failed in the startup sequence by checking the state of the LEDs on the power modules and line cards, and on the alphanumeric displays on the RP.

Note You can use the test gsr led Cisco IOS software command to perform an LED lamp test, which turns on all of the system LEDs at the same time for a specified period. This test allows you to verify that there are no failed LEDs.

You should observe the following when you power on the router:

•INPUT OK LEDs—These LEDs should light immediately; they should remain on as long as the system is receiving power from the power source and the power switch is in the on position.

The LEDs indicate the status of the PEM and internal DC voltages. If either LED does not light, or if they shut off while the power switch is on, there could be a problem with either the power source, the internal DC voltage used to power internal components, or the cooling subsystem.

The LEDs remain on when all of the following conditions are met:

–AC PEMs: The AC power source voltage is operating between

100-120 VAC and is using 15-Amp service for North America, or is operating between 185-264 VAC and is using 10-Amp service in an international environment.

–DC PEMs: The DC power source is supplying power to the PEMs and the power switch is in the on position.

Note The amber OUTPUT FAIL LED is normally off, but lights if the PEM detects a fault.

–The power supplies are providing –48 VDC to internal components.

	Cisco XR 12406 Router Installation Guide
OL-13831-01		4-3