Cisco XR 12404 - Manual (Page 101)

4-3
Cisco XR 12404 Router Installation Guide
OL-13830-02
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.
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.
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