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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 peripheral at the end of each cable, or the end of the cable itself,
has a terminator installed (or enabled). The peripherals between the
ends of each cable must have its terminator removed (or disabled).
Since the method for terminating a SCSI peripheral can vary widely,
refer to the peripheral’s documentation for instructions on how to
enable or disable termination. Here are some general guidelines for
n Termination on internal SCSI peripherals usually is controlled
by manually setting a jumper or a switch on the peripheral, or
by physically removing or installing one or more resistor mod-ules
on the peripheral.
n Termination on external SCSI peripherals usually is controlled
by installing or removing a SCSI terminator. On some external
peripherals, termination is controlled by setting a switch on the
back of the drive.
n By default, termination on the SCSI Card 2940U2W itself is
automatic (the preferred method). To manually set termination
on the SCSI Card 2940U2W, see Configuring the SCSI Card
2940U2W with SCSISelect on page 15.
n Internal Ultra2 peripherals are set at the factory with termina-tion
disabled and cannot be changed. Proper termination for
internal Ultra2 peripherals is provided by the built-in termina-tor
at the end of the Ultra2 internal SCSI cable.
n Most non Ultra2 SCSI peripherals come from the factory with
termination enabled.

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