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1. Introduction
Connecting Your SCSI Peripherals
All internal SCSI bus connections to the LSI integrated SCSI integrated SCSI
are made with an unshielded, 68-conductor ribbon cable. One side of this cable
is marked with a color to indicate the pin-1 side. The connectors on this cable
are keyed to ensure proper pin-1 connection. Use Ultra/Ultra2 rated cables for
these bus speeds.
All external SCSI bus connections to the LSI integrated SCSI integrated SCSI
are made with shielded, 68-conductor cables. The connectors on this cable are
always keyed to ensure proper pin-1 connection. Some internal cables come
with a SE/LVD on one end. This end should be furthest from the integrated
SCSI.
SCSI Bus Termination
The devices that make up the SCSI bus are connected serially (chained together)
with SCSI cables. The first and last physical SCSI devices connected on the ends
of the SCSI bus must have a set of resistors called terminators. All other SCSI
devices on the bus must have their terminators removed or disabled.
REMEMBER: The LSI integrated SCSI integrated SCSI is also on the
SCSI bus, and its termination is automatically enabled when it is con-
nected to the end of the bus.
Low-voltage differential peripheral devices are normally terminated with ex-
ternal terminators, but are sometimes set with jumpers or with a switch on the
peripheral. Refer to the peripheral manufacturer's instructions and to the user's
manual for your computer for information on how to identify the terminator
setting of each device and how to change it.
When connecting another integrated SCSI to a connector, termination must be
disabled on the board that is not at the end of the bus through software control.
Internal SCSI Connections
If only internal SCSI device connections on your integrated SCSI have been
made, then terminate the last internal device on the SCSI bus. You must disable
the termination on all other devices. Termination on the LSI integrated SCSI
integrated SCSI is automatically enabled in this case.
ASUS LSI SCSI User's Manual
5
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