LSI U80ALVD - Manual (Page 25)

Detailed Installation Procedure 2-7
2.2.3 Connecting the SCSI Peripherals
SCSI bus connections to the LSIU80ALVD inside your computer can be
made with an unshielded 68-conductor Ultra SCSI PVC ribbon cable
(see
Figure 2.3 ). One side of this cable is marked with a colored stripe
to indicate pin 1. Sometimes the connectors on this cable are keyed to
ensure proper pin-1 connection.
All external SCSI bus connections to the LSIU80ALVD are made with
high quality shielded 68-conductor cables (see
Figure 2.3 ). The
connectors on this cable are always keyed to ensure proper pin-1
connection.
Note: All the cables shown in Figure 2.3 are included in the
LSI Logic Adapter Board Kit for the LSIU80ALVD.
You can connect up to eight SCSI, Fast SCSI, and Ultra SCSI devices
on a SE Ultra SCSI bus only if they are evenly spaced on a 1.5-meter
Ultra SCSI cable (0.19 m between devices).
Table 2.1 SCSI Bus Widths and Speeds
STA Terms
SCSI Bus
Width, Bits
SCSI Bus Speed
Maximum Data Rate,
Mbytes/s
SCSI-1 8 5
Fast SCSI 8 10
Fast Wide SCSI 16 20
Ultra SCSI 8 20
Wide Ultra SCSI 16 40
Ultra2 SCSI 8 40
Wide Ultra2 SCSI 16 80
Note: Absence of the word “Wide” means an 8-bit bus width. It is
acceptable to use the word “Narrow” to avoid ambiguity.