Adaptec 39160 Installation Guide download pdf (Page 10)

Adaptec SCSI Card 39160 User’s Reference

Terminating the SCSI Bus

To ensure reliable communication on the SCSI bus, the ends of the

SCSI bus must be properly terminated. This is accomplished when

the device at the end of each cable, or the end of the cable itself, has a

terminator installed (or enabled). Terminators must be removed, or

termination must be disabled, on devices between the ends of each

cable.

Since the method for terminating a SCSI device can vary widely,

refer to the device’s documentation for instructions on how to

enable or disable termination. Here are some general guidelines for

termination:

■

Internal Ultra160 and Ultra2 SCSI devices come from the fac-

tory with termination disabled and cannot be changed. Proper

termination for these internal devices is provided by the built-

in terminator at the end of the 68-pin internal LVD SCSI cable.

■

Termination on Wide SCSI, Narrow SCSI, and Ultra SCSI

devices usually is controlled by manually setting a jumper or a

switch on the device, or by physically removing or installing

one or more resistor modules on the device.

■

Termination on most external SCSI devices is controlled by

installing or removing a SCSI terminator. However, termina-

tion on some external SCSI devices is enabled or disabled by

setting a switch on the back of the SCSI device.

■

By default, termination on the Adaptec SCSI Card 39160 itself

is set to

Automatic

(the preferred method). We recommend that

you do not change this default setting.

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Adaptec 39160 Installation Guide Page 10