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When the system is powered on, the blower modules immediately begin operating. The
green fan OK LED should be lit on both blower modules.
— If the input OK LED is on, but a blower module is not operating, there is a problem
— If the input OK LED is on at startup and a blower is operating, but the system shuts
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When the system is powered on, the alphanumeric LED displays on the RP indicate the
following:
— The top display indicates which RP software component is running.
— The bottom display indicates the phase of the boot process that is currently
Troubleshooting the Power Subsystem
The power subsystem in the Cisco 12012 consists of the AC-input or DC-input power
supplies, the MBus modules, the DC-DC converters, and the power distribution system.
The power supplies provide +5 and –48 VDC output. The +5 VDC output from the power
supply powers the MBus modules on each card in the system. The MBus modules, in turn,
control the DC-DC converters also present on each card in the system. The DC-DC
converter takes –48 VDC from the power supply and converts it into +5 and +3.3 VDC,
which is distributed to the card circuitry.
Begin checking the power subsystem by first looking at the two LEDs on the power supply
faceplate. The input OK LED on a DC-input power supply, or the AC OK LED on an
AC-input power supply goes on when the power supply power switch is turned on (|) and
the power supply is receiving source AC or DC power.
The red output fail LED is normally off, but goes on if the power supply detects a fault.
In systems with a single DC-input power supply, and in systems with redundant power
when both power supplies are being shut down, the output fail LED lights momentarily as
the system ramps down, but is off when the power supply has completely shut down.
with the blower. (The system will shut itself down if it detects that one or both of
the blower modules is not functioning properly.) Proceed to the section
"Troubleshooting the Cooling Subsystem."
down after two minutes, there might be a problem with the blower control board.
Proceed to the section "Troubleshooting the Cooling Subsystem."
occurring.
Troubleshooting the Power Subsystem
Troubleshooting the Installation 5-7
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Table of Contents
Troubleshooting
