Asus AP2500 Довідковий посібник з обладнання - Сторінка 24

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II. System Components

SCSI Backplane

The SCSI backplane of this server is comprised of one SCSI board(DA-

BP5) with Ultra2 SCSI connectors, power inputs, and SCSI ID dip switches.

This configuration allows Ultra2 SCSI SCA hard disk drives to be docked

into the server using a SCA connector. The SCSI board(DA-BP5) dose not

has a terminator build in so the included terminator block must be used on

the end connector.(see picture below)

SCSI Board Placement

There are six screws on the SCSI board. The extended expansion card guide

must be removed before the SCSI board can be removed. The SCSI board

has one side with two connectors and three power connectors and another

side with either three or five SCSI SCA connectors. Face the side with the

power connector toward the motherboard. In order to ensure proper orienta-

tion of the SCSI board, the screw holes are not placed symmetrically.

SCSI Board Power Installation

There are three power connectors on the front side of the SCSI board. The

PWR1 and PWR2 connectors have to be connected to the power supply, the

PWR3 connector is a spare power connector which will supply power if

PWR1 and/or PWR2 connectors fail to supply power. The voltage distribu-

tion for the three power connectors are not equal due to the enormous volt-

age and current requirements by the SCSI drives.

SCSI ID Select

DIP Switch

PWR3 Connector

PWR2 Connector

PWR1 Connector

The provided terminator must be placed on this bottom SCSI connector.

AP2500 Hardware Reference Guide