Alpha Microsystems AM-402 Handleiding voor installatie-instructies - Pagina 6

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SCSI BUS TERMINATION

To function properly, the SCSI bus on your computer must be terminated at each end. The SCSI

controller terminates one end of the bus; the opposite end of the bus can be terminated in one of two

ways: 1) using the preferred method—an external terminator, or 2) installing on-board terminators in the

peripheral that's at the other end of the SCSI cable. You should use method 2 only if, for some reason,

you cannot use an external terminator.

External SCSI Bus Termination

The preferred way to terminate the SCSI bus in an AMOS computer is to install an external terminator.

Using an external terminator makes it easier to install an add-on subsystem (like a portable CD-ROM

drive), eliminating the need to remove terminators from a SCSI device inside the computer.

Several different external terminators are available from Alpha Micro:

Part Number

PRA-00222-00

PRA-00222-21

PRA-00222-20

The type of terminator you need depends on your computer and the SCSI peripherals in it. The AM-402

CD-Recorder should function correctly with a passive SCSI terminator. However, the Eagle 250, 450,

AM-6000, AM-7000, and Roadrunner 040 and 060-equipped computers require active termination, as do

certain other peripheral devices. Generally, if either the computer or any peripheral in it requires active

termination, be sure to use an active terminator, and insure that no SCSI peripheral inside the computer is

terminated.

Internal SCSI Bus Termination

If you are not using external SCSI termination, you may terminate the SCSI bus by enabling the

termination resistors on the last SCSI device—the one farthest away from the SCSI controller. For best

termination and most reliable SCSI performance, this device should be at the actual physical end of the

SCSI cable. If the SCSI cable extends beyond the device which provides termination, even if there are no

more devices attached, termination will not be as reliable as it would be if the actual end of the cable was

terminated. Because of their higher performance, newer computers, such as the AM-6000, are more

sensitive to termination issues than earlier ones.

Be sure that only the last SCSI device has its on-board termination enabled. If more than one

device on the SCSI bus has its termination enabled, your system will probably perform

erratically! This is true whether the last device is in the computer chassis or in a separate

subsystem chassis.

PDI-00402-00, Rev. A02

Installation Instructions: AM-402 SCSI CD-Recorder

Terminator Type

Narrow, passive

Narrow, active

Wide, active