Using The System Leds To Troubleshoot - Cisco XR 12404 Installation Manual

Chapter 4 Troubleshooting the Installation

Using the System LEDs to Troubleshoot

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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.
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.
The amber OUTPUT FAIL LED is normally off, but lights if the
Note
PEM detects a fault.
The power supplies are providing –48 VDC to internal components.
–
Identifying Startup Problems
Cisco XR 12404 Router Installation Guide
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