I/O Ports And Connectors - Dell Precision 420 User Manual

MOUSE
NIC
PANEL
PARALLEL/SCSI
PCI1, PCI2, PCI3
PCI4, (PCI5)
PCI5\RAIDPORT
RAID
SCSI_LVD
SCSI_NARROW
SERIAL1/2
SPKR
TAPI
PROC_0
PROC_1
USB 1/2
WUOL
NOTE: For the full name of an abbreviation or acronym used in this table, see the Glossary.

I/O Ports and Connectors

The I/O ports and connectors on the back panel of your computer are the gateways through which your computer system communicates with
external devices, such as a keyboard, mouse, printer, and monitor.
Figure 3. I/O Ports and Connectors
Serial and Parallel Ports Overview
The two built-in 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.
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 your
computer's built-in parallel port is LPT1.
PS/2 mouse connector
10/100 Ethernet RJ45 connector
Control panel connector
Parallel connector over Wide SCSI connector (stacked)
PCI expansion-card connectors on primary PCI bus
PCI expansion-card connectors on secondary PCI bus
RAID port connector extension to PCI5
Optional RAID PCI expansion card connector extension
Primary (LVD/Wide) SCSI connector
Secondary (Narrow) SCSI connector
Serial port connectors (sometimes referred to as
COM1 and COM2; stacked)
Internal speaker connector (on control panel)
Telophony microphone and speaker connector
SECC2 cartridge connector for processor 0
SECC2 cartridge connector for processor 1
USB connectors (stacked)
Remote wakeup on LAN connector
Figure 3 identifies the I/O ports and connectors for your computer.
1 Parallel port connector
2 Serial port 1 connector
3 PS/2 mouse connector
4 PS/2 keyboard connector
5 USB connectors
6 Video out connector (may be
in bottom or second
expansion slot)
7 NIC connector
8 Diagnostic LEDs
9 Line-in jack
10 Line-out jack
11 Microphone jack
12 Serial port 2 connector
13 External SCSI connector