Dell PowerEdge 2450 - Manual (Page 56)

7-6 Dell PowerEdge 2450 Systems Installation and Troubleshooting Guide

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The system board holds the computer's control circuitry and other electronic compo-
nents. Several hardware options such as the microprocessors and memory are
installed directly on the system board. The expansion-card cage accommodates up to
three full-length PCI expansion cards.The two peripheral bays provide space for a
3.5-inch diskette drive, CD-ROM drive, and an additional 5.25-inch device such as a
tape drive.
The hard-disk drive bays provide space for up to four 1-inch SCSI hard-disk drives.
These hard-disk drives are connected to a SCSI host adapter on the system board or
on an expansion card, via the SCSI backplane board.
The power cables leading from the power supply, power-supply distribution board
(PSDB), and interposer board provide power to the system board, SCSI backplane
board, and drives in the peripheral bays.
For non-SCSI drives such as the diskette drive and CD-ROM drive, an interface cable
connects each drive to the interposer board, or to an expansion card. For SCSI
devices, interface cables connect externally accessible SCSI devices and the SCSI
backplane board to a SCSI host adapter either on the system board or on an expan-
sion card. (For more information, see Chapter 9, “Installing a Drive in the Peripheral
Bay” and Chapter 10, “Installing Hard-Disk Drives”).
During an installation or troubleshooting procedure, you may be required to change
a jumper or switch setting. For information on the system board jumpers, see
Appendix A, “Jumpers, Switches, and Connectors.”
system board
microprocessors
optional redundant
power supplies (2)
cooling fans (3)
IDE CD-ROM drive
hard-disk
drive bays (4)
power-supply distribution board
diskette drive
expansion-card cage
interposer board