Troubleshooting the Processor Subsystem
Cisco 12008 Gigabit Switch Router Installation and Configuration Guide
5-12
•In systems powered by source DC, check the cable connections to the terminal studs on
the DC-input power supply faceplate to ensure that the correct polarity (+ and –) has
been observed in making the connections.
•Is the power cord (AC) or the power cable (DC) from the power source to the router in
good condition and not damaged? If insulation on the cord or the cable appears cracked
or broken, or if the AC plug or the DC terminal lugs appear to be loose, do not use the
item. Immediately replace it with a new AC power cord or a new DC power cable.
•If the AC INPUT OK LED (AC-input power supply) or the INPU T OK LED (DC-input
power supply) still fails to go on after you connect the power supply to a new power
source, swap the existing power cord or cable with a replacement unit.
•Turn the rotary power switch back ON. If the AC INPUT OK LED (AC-input power
supply) or the INPUT OK LED (DC-input power supply) goes on, return the first power
cable for replacement.
•If the AC INPUT OK LED (AC-input power supply) or the INPU T OK LED (DC-input
power supply) still fails to go on when the router is connected to a different power
source with a new power cable, the power supply itself is probably faulty.
•If a spare power supply is available, replace the existing power supply with the spare
unit and restart the system. If the AC INPUT OK LED (AC-input power supply) or the
INPUT OK LED (DC-input power supply) goes on, return the faulty power supply for
replacement.
If you are unable to resolve the problem, or if you determine that either the power supply
or the power cord (AC) or power cable (DC) is faulty, contact your Cisco service
representative for assistance.
Troubleshooting the Processor Subsystem
The Cisco12008 processor subsystem consists of the RP and the line cards.
The RP and the line cards each have two onboard processors. One processor serves as the
card’s main processor, and the other serves as the MBus module processor. The latter
monitors the card’s environment and controls the card’s onboard DC-DC converter.