ATTO Technology FastStream SC 5700 - Manual (Page 71)

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Exhibit A-2 Various types of SCSI operate at different speeds and require different bus lengths to support
a certain number of devices.
STA terms
Bus speed
MB/sec.
max. Bus
width
bits
Max. bus lengths in meters
Max. device
support
Single-
ended
Differential LVD
Fast SCSI 10 8 3 25 NA 8
Fast/WIDE SCSI 20 16 3 25 NA 16
UltraSCSI 20 8 1.5 25 NA 8
Ultra/WIDE SCSI 40 16 NA 25 NA 16
Ultra/WIDE SCSI 40 16 1.5 NA NA 8
Ultra/WIDE SCSI 40 16 3 NA NA 4
Ultra2 SCSI 80 16 NA NA 12 8
Ultra2/WIDE SCSI 80 16 NA NA 12 16
Ultra160/WIDE SCSI 160 16 NA NA 12 16
Ultra320 SCSI 320 16 NA NA 12 16