Specifications

Page 90 DocSTAR Level 2 Service Training Workbook
Appendix A: SCSI Interfaces
Names Max
Speed
(MB/s)
No. of
Devices
(A,B)
Max Total
Length of
Cable
External Connector Types Comments
SCSI-1 SCSI-1 5 8 6m
D
50-pin low-density
(SCSI-1, Centronix, A-Cable)
Many
peripherals
are
available.
Fast SCSI 10 8
50-pin low-density
(SCSI-1, Centronix, A-Cable)
50-pin high-density (SCSI-2)
SCSI-2
Fast Wide SCSI 20 16
Up to 4
devices
3m:
5 or more
devices
1.5m
68-pin
Backward-
compatible
w/SCSI-1.
“Wide”
products
use 16-bit
instead of
8-bit data
paths.
Ultra SCSI 20 8 1.5m
D, LVD
Ultra2 SCSI
40 8 12m
Ultra3 SCSI 80 8 12m
50-pin low-density
(SCSI-1, Centronix, A-Cable)
50-pin high-density (SCSI-2)
Ultra Wide SCSI 40 16 1.5m
D, LVD
Ultra2 Wide
SCSI
80 16 12m
SCSI-3
Ultra3 Wide
SCSI
160 16 12m
68-pin
Backward
compatible
w/SCSI-1 &
SCSI-2.
“Wide”
products
use 16-bit
instead of
8-bit data
paths.
(A): Including Host Adapter.
(B): Per channel.
(D): Differential allows for cable lengths up to 25 meters.
(LVD): Low Voltage Differential allows for cable lengths up to 12 meters.