Fujitsu D1031 Technisches Handbuch - Seite 14

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Features

SCSI bus termination

SCSI is the abbreviation for Small Computer System Interface.

The system board is equipped with an Ultra 2 SCSI controller SYM 53C895 with SCSI bus

extension SYM 53C141. There are two SCSI connections for Ultra SCSI (single-ended; max. 40

Mbyte/s) and Ultra 2 SCSI (low voltage differential; max. 80 Mbyte/s) on the system board.

The Ultra 2 SCSI controller is used as an interface between the system interface and devices with

an SCSI interface, called SCSI devices in the following.

SCSI devices are interconnected with a cable routed from device to device. This provides all

devices with access to a common "SCSI bus".

The operating manual or the technical manual for your SCSI device explains how to install and

operate your SCSI device.

Ultra SCSI connection (single-ended; max. 40 Mbyte/s)

Here you can connect accessible SCSI drives. The Ultra SCSI connection is always terminated.

Connect the SCSI devices so that the Ultra SCSI connection on the system board is located at one

of the two ends of the SCSI bus. Ensure the correct termination of the SCSI device at the other end

of the SCSI bus. The termination must be removed or deactivated on all other internal SCSI

devices.

The description of your SCSI devices contains instructions on how to remove or deactivate the

termination of the SCSI devices.

Ultra 2 SCSI connection (low voltage differential; max. 80 Mbyte/s)

Here you can connect SCSI hard disks, e.g. via an SCSI platter in the system unit. The termination

of the Ultra 2 SCSI connection can be activated and deactivated via the BIOS setup (menu item

SCSI Termination LVD). The default setting is Enabled. The termination affects the entire bus width

(low byte and high byte).

You may find further information in the description "BIOS Setup".

Connect the SCSI devices so that the Ultra 2 SCSI connection on the system board is located at

one of the two ends of the SCSI bus. Ensure the correct termination of the SCSI device at the other

end of the SCSI bus.

If you connect SCSI devices to both ends of the Ultra 2 SCSI connection and the SCSI controller is

then not located at the end of the SCSI bus, deactivate the termination of the Ultra 2 SCSI

connection via the BIOS setup. In this case ensure the correct termination of the two SCSI devices

at the ends of the SCSI bus.

The description of your SCSI devices contains instructions on how to remove or deactivate the

termination of the SCSI devices.

Then the Ultra 2 SCSI connection only operates in the Ultra 2 mode (LVD) when all connected SCSI

devices support Ultra 2. If even one device is connected which only supports the Ultra SCSI mode,

all connected devices will automatically be switched into the Ultra SCSI mode (SE).

The SCSI BIOS and the drivers for the SCSI controller are described in the manual "PCI SCSI

Device Management System SMDS 4.0".

6 - English

A26361-D1031-Z120-10-7419