LSI U160 - Manual (Page 27)

3.75 pc 10.25 pc 11.25 pc 38.25 pc
4.333 pc
48.583 pc
52.5 pc
34.5 pc
44.25 pc
Detailed Installation Procedure 2-7
2.2.3 Connecting the SCSI Peripherals
SCSI bus connections to the LSIU160 inside your computer can be made
with an unshielded 68 conductor Ultra SCSI TPE ribbon cable (see
Figure 2.3 ). The lead connected to pin 1 on the cable is marked with a
colored stripe. The connectors on this cable may also be keyed to ensure
proper pin-1 connection.
All external SCSI bus connections to the LSIU160 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 LSIU160.
A list of the SCSI bus width and maximum data transfer rate, for various
SCSI definitions, is provided in
Table 2.1 .
You can connect up to eight SCSI, Fast SCSI, and Ultra SCSI devices
on an 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
Ultra160 SCSI 16 160