Chapter 4 Troubleshooting the Installation
Troubleshooting the DC Power Subsystem
•If no, but the fan assembly is operating, suspect a faulty power supply INPUT OK LED. If the fan assembly is operating, all internal DC voltages are within tolerance. Use the show environment command to check the voltages on each card. The fan assembly uses
If you are unable to resolve the problem or if you determine that either the power supply or power cable is faulty, contact a service representative for assistance.
Troubleshooting the DC Power Subsystem
The DC PEMs and PDUs provide DC power to the router which is distributed to the card circuitry.
Begin checking the power subsystem by first looking at the three LEDs on the PEM. The INPUT OK LED on an DC PEM is on when DC power is applied, The OUTPUT OK LED is on when the power switch is turned on.
•The amber OUTPUT FAIL LED is normally off, but comes on if the PEM detects a fault.
•The DC PEMs are monitored by the MBus module and the RP for
Figure 4-2 shows the location of the LEDs on the PEM.
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