
Chapter 4 Troubleshooting the Installation
Troubleshooting Overview
•Chassis backplane power distribution.
•Processor
•Cooling
Normal Router Startup Sequence
You can generally determine when and where the router failed during the startup sequence by checking the status LEDs on the power modules, and the alphanumeric displays on the RP and line cards.
In a normal router startup sequence, the following sequence of events and conditions occur:
1.The fans in the blower module receive power and begin drawing air through the chassis.
The blower module OK indicator is on.
2.The fan in each PEM receives power and begins drawing air through the power supply.
The power supply Pwr OK indicator is on.
3.As the power on and boot process progresses for the RP and each installed line card, the status of each card appears on the alphanumeric display on the front panel of the card:
–The upper row of the display is powered by the
–The lower row of the display is powered by the +5 VDC provided through the backplane.
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