Dell POWEREDGE 1855 - Manual (Page 17)

The back of the chassis supports four I/O module bays, the DRAC/MC, fan modules, and power supply modules. Figure 2 -5 shows a sample configuration and
the numbering for the bays. Table 2 -4 provides information about the back-panel features.
Figure 2-5. Back-Panel Features
Table 2-4. Back-Panel Features and Indicators
Power Supply Indicator
Each hot-pluggable power supply has indicators that provide information about power status, fault, and the presence of AC power (see Figure 2 -6 ). Table 2 -5
lists the power supply indicator codes.
Figure 2-6. Power Supply Indicators
Table 2-5. Power Supply Indicator Codes
Component Indicator Description
Power supply modules Provide information about power status (see " Power Supply Indicator Codes ").
Fan modules Provide information about status of the system fans (see " Fan Module Indicators ").
KVM module Provides information about the KVM module (see " KVM Modules ").
DRAC/MC module Provides information about system status, system management status, and port status (see " DRAC/MC
Module ").
PowerConnect™ 5316M Ethernet switch
module Provides information about the 10/100/1000 BASE-T network status (see " PowerConnect 5316M Ethernet
Switch Module ").
Fibre Channel pass-through module Provides information about the Fibre Channel network status (see " Fibre Channel Pass-Through Module ").
Fibre Channel switch module Provides information about the Fibre Channel network status (see " Fibre Channel Switch Module ").
Infiniband pass-through module Provides information about the Infiniband network status (see " Infiniband Pass-through Module ").
Gb pass-through module Provides information about the network status (see " Gb Ethernet Pass-through Module ").
NOTICE: 2100-W power supply modules require 170-264 V to operate; 1200-W power supply modules (systems sold prior to April 2005) require 180–
264 V to operate. If they are plugged into 110-V electrical outlets, the power supply modules will not power up.