Chapter 4 Troubleshooting the Installation
Problem Solving with Subsystems
4-24
Cisco 12006 and Cisco 12406 Router Installation and Configuration Guide
OL-11497-03
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For installations in North America, the AC input power range is between
100 and 240 VAC, with a 20A service. For international environments,
the AC input power range is between 185 and 264 VAC, with a 16A
service.
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Power supplies are providing –48 VDC to internal components.
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All internal DC voltages are within tolerance.
If the AC power source or any of the power supply internal DC voltages
exceed allowable tolerances, the DC LED will not go on, or will go off
shortly after you turn on the power standby switch.
The power supplies are monitored by the MBus module and the RP for over- or
undervoltage and over- or undercurrent conditions.
To help isolate a problem with an AC-input power supply, follow these steps:
Step 1 If the AC LED is off, verify that the power supply is fully seated in its bay, the
ejector levers are flush with the power supply faceplate, and the captive screws
are secured.
• If the AC LED goes on, go to Step 6.
• If the AC LED remains off, go to Step 2
Step 2 Check the AC power source.
a. Check the AC power cord from the power source to the router.
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Verify that the power cord is seated securely in the PDU and the AC
outlet.
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Verify that the power cord is not worn or damaged. If the insulation
appears cracked or broken, or the plugs appear loose, replace the power
cord with a new power cord.
b. Verify that the AC power source circuit breaker is on and has not tripped, and
that the circuit breaker has the proper current rating.
c. Verify that each power supply in the router is attached to a separate AC power
source.
d. If the router is connected to an uninterruptable power supply (UPS), verify
that the UPS is functioning correctly. Note that there might be a UPS for each
power supply in the system.