SCSI Evolution
Common Name(s) | Maximum Speed (MB/second) | Signaling | Maximum Devices | Cable Lengths |
SCSI-1 | 5 | single-ended | 7 | up to 6m |
SCSI-2 Fast SCSI | 10 | single-ended, high-voltage differential | 7 15 | up to 6m single-ended up to 25m differential |
SCSI-3 Fast & Wide SCSI | 20 | single-ended, high-voltage differential | 7 15 | up to 6m single-ended up to 25m differential |
Ultra SCSI | 40 | single-ended, high-voltage differential | 7 15 | up to 6m single-ended up to 25m differential |
Ultra2 SCSI | 80 | low-voltage differential | 15 | up to 25m point-to-point up to 12m for multiple devices |
Ultra3 SCSI or Ultra160 SCSI | 160 | low-voltage differential | 15 | up to 25m point-to-point up to 12m for multiple devices |
Ultra320 SCSI | 320 | low-voltage differential | 15 | up to 25m point-to-point up to 12m for multiple devices |
