Power Supplies - Cisco 8540 - Catalyst Campus Switch Router Modular Expansion Base Installation Manual

Chapter 1 Product Overview

Power Supplies

Power Supplies
The Catalyst 8540 is a 13-slot, modular chassis with optional dual, fault-tolerant,
load-sharing AC or DC power supplies. In the event of a failure of source power
to one supply, or the failure of one power supply, the redundant power option
ensures uninterrupted operation. Table A-1 on page A-1 lists system power
specifications, including input voltage and operating frequency ranges. Before
connecting each unit, note its power consumption rating in Table A-1 on
page A-1.
Each power supply monitors its own output voltage and shuts down if it detects a
critical condition within the power supply. The reporting functions retrieve and
display the present values of measured parameters. If any of the monitored
parameters exceed defined thresholds, the reporting functions display alarms on
the console.
The environmental monitoring functions use two levels of status conditions,
normal and alarm, to monitor the system. The processor monitors the temperature
inside the module compartment, and the power supplies use the normal and alarm
levels to monitor voltages.
The power supply monitors its own internal temperature and voltages. It is either
within tolerance (normal, 0 to 50 C) or out of tolerance (alarm, > 55 C). If an
internal power supply temperature or voltage reaches the alarm level, the Output
Fail LED may turn red and the power supply can shut down the system. Each
power supply contains a power supply fan. Cool air enters the power supply from
the front and exhausts at the rear. (See Figure 1-4.)
If the power supply shuts down, turn the power switch off (0), wait
Note
several minutes for the supply to cool, and then turn the power
switch on ( | ). If the power supply shuts down again, remove and
replace it.
Catalyst 8540 Chassis Installation Guide
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