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CiscoASR 9000 Series Aggregation Services Router Hardware Installation Guide
Chapter4 Troubleshooting the Installation
Troubleshooting the Power Subsystem
•Fault LED (red)—Indicates that the system has detected a fault within the power supply. This
indicator remains off during normal operation. If the fault LED is on, check the following:
–
If your system has more than one power tray (CiscoASR 9010 Router,
Cisco ASR 9922 Router, and CiscoASR 9912 Router) with power modules installed for
redundancy, you can toggle the power switch at the rear of the first power tray off and then on.
If the fault LED is still on, eject and reseat the power module. If the fault LED remains on after
several attempts to power it on, replace the power module with a spare.
–
If the spare power module also fails, the problem could be a faulty power tray backplane
connector. Power off the router and contact a Cisco service representative for assistance.
–
Verify that the power module fans are operating properly.
–
Verify that the fan tray is operating properly.
–
If the power module fans and the fan trays are operating properly, replace the faulty power
module with a spare.
Caution Because there are redundant power modules, a problem with the DC output voltage to the backplane
from only one power module should not affect router operation. When the router is equipped with two
DC power supplies, it powers on even if one power supply fails. However, complete router functionality
may be affected depending on the system load.
Additional Power Subsystem Troubleshooting Information
This section contains additional troubleshooting information to help you isolate the cause of a power
problem.

Obtaining Temperature and Environmental Information

If both the RSP/RP and fan trays are operating, all internal correct DC voltages are present.
Enter the show environment command at the router admin prompt to display temperature and voltage
information for each installed card, fan tray, and power module as shown in this example:
RP/0/RSP0/CPU0:router(admin) #show environment
Temperature Information
---------------------------------------------
R/S/I Modules Inlet Hotspot
Temperature Temperature
(deg C) (deg C)
0/RSP0/*
host 25.3 41.6
0/0/*
host 29.2 30.0
0/1/*
host 35.0 46.6
0/FT0/*
host 21.2 20.8