Asus AP2500 Hardware Reference Manual - Page 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.
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AP2500 Hardware Reference Guide