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I/O Ports and Connectors: Dell™PowerEdge™4400SystemsUser'sGuide

Overview

This section provides specific information about the input/output (I/O) ports and connectors on the back panel of the computer.

I/O Ports and Connectors

The I/O ports and connectors on the back panel of the computer are the gateways through which the computer system communicates with external

devices, such as a keyboard, mouse, printer, and monitor. Figure 1 identifies the I/O ports and connectors for your system.

Figure 1. I/O Ports and Connectors

Serial and Parallel Ports

The two integrated serial ports use 9-pin D-subminiature connectors on the back panel. These ports support devices such as external modems,

printers, plotters, and mice that require serial data transmission (the transmission of data one bit at a time over one line).

Most software uses the term COM (for communications) plus a number to designate a serial port (for example, COM1 or COM2). The default

designationsofyourcomputer'sintegratedserialportsareCOM1andCOM2.COM1isthebottomconnector;COM2isonthetop.

The integrated parallel port uses a 25-pin D-subminiature connector on the computer's back panel. This I/O port sends data in parallel format

(where eight data bits, or one byte, are sent simultaneously over eight separate lines in a single cable). The parallel port is used primarily for

printers.

Most software uses the term LPT (for line printer) plus a number to designate a parallel port (for example, LPT1). The default designation of the

computer's integrated parallel port is LPT1.

Port designations are used, for example, in software installation procedures that include a step in which you identify the port to which a printer is

attached, thus telling the software where to send its output. (An incorrect designation prevents the printer from printing or causes scrambled print.)

Adding an Expansion Card Containing Serial or Parallel Ports

Overview

Video Connector

I/O Ports and Connectors

USB Connectors

Serial and Parallel Ports

Integrated Network Interface Controller Connector

Keyboard and Mouse Connectors

Mouse connector

Keyboard connector

USB connectors (2)

NIC connector

Serial port 1 connector

Parallel port connector

Serial port 2 connector

Video connector

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Dell PowerEdge 4400 User Manual Page 37

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