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Cisco 12404 Internet Router Installation and Configuration Guide
OL-11636-01
Chapter 4 Troubleshooting the Installation
Problem-Solving with Subsystems
AC Power Entry Module
The Cisco 12404 Internet router can be configured for an AC power source. For
the troubleshooting procedures in this chapter, the Cisco 12404 router consists of
two AC power entry modules (PEMs).
DC-DC Power Converters
A DC-DC power converter is installed on each card in the card cage. The
converter is under control of the MBus module, another component on each card.
The DC-DC converter takes –48 VDC and converts it into +2.5, +3.3 and +5 VDC
for use by the card circuitry.
Cooling System
Cooling subsystem is comprised of one fan tray assembly and one air filter. The
fan tray assembly and air filter are hot swappable, and can be replaced while the
system is running. The fan tray assembly should be operating whenever the
system power is on; except when the fan tray assembly is being removed and
replaced.
Warning
Replace the fan tray assembly within 2 minutes of removing it from the chassis
or the router will go into a critical failure mode and shutdown, due to an
overtemp condition.
Caution
Replace the fan tray assembly safely and quickly to maintain EMI compliance.
Processor Subsystem
The processor subsystem includes the RP and all line cards. Each card has an
onboard processor. The RP downloads a copy of the Cisco IOS image to each line
card processor. A line card or RP that is partially installed in the backplane might
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