Installation
BXB
Page
11
The last connector labeled SCJ3 is a single 68-pin “Wide” connector for LVD
mode SCSI devices operating at a maximum data transfer rate of 80 Mbytes/sec.
The maximum cable length that can be used is 12 meters with up to 15 SCSI LVD
devices. It is strongly recommended that no single-ended (SE) legacy SCSI devices
be used on this connector as performance will drop to a 40 Mbytes/sec maximum
with device and cable length limitations of the above first two connectors!
SCSI Bus Termination
Proper operation of the SCSI bus requires the following: each device must have a
unique SCSI ID (including the SCSI controller) and the SCSI chain must have
termination on each of the 3 onboard connectors. Termination is required at the last
device on each SCSI cable.
Termination for the majority of devices are accomplished by enabling a jumper or
terminator resistor. No terminator is required for the SCSI controller onboard the
motherboard as this will be set automatically. When using the “external SCSI-2 port
adapter” the external SCSI device must provide termination.
The Ultra-2 (LVD) cable is provided with a terminator which attaches to the end of
the cable.
