Router Installation Guide

Chapter 1 Cisco XR 12404 Router Overview
Power Entry Modules
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Cisco XR 12404 Router Installation Guide
OL-13830-02
AC PEMs
Each AC PEM converts 200 to 240 VAC into -48 VDC, which is distributed
through the chassis backplane to all cards, RPs, and the fan assembly.
Figure 1-8 identifies the components of an AC power supply.
Figure 1-8 AC PEM Components
The status LEDs on the AC PEM provide information about the current
operational status of the power supply. Table 1-4 summarizes the function of these
indicators.
1 AC PEM finger grips 4 Power cord receptacle
2 On/Off switch 5 Status LEDs
3 Bail latch 6 Captive screws
INPUT
OK
OUTPUT
FAIL
IN
P
U
T
100-240V
12A
50/80H
Z
OUTPUT
OK
66289
456
1
2 3
Table 1-4 AC-Input PEM LED Indicators
LED Label Color Function
OUTPUT OK Green PEM is powered on and operating normally.
todd.book Page 18 Tuesday, July 24, 2007 3:54 PM