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ADAC Ultra2 S466 Hardware Guide
2
Single Ended and Differential SCSI Buses
The SCSI standard defines two electrical buses:
• a single ended bus and
• low-voltage differential bus.
Maximum Cable Length for SCSI Standards
Standard Single ended LVD Maximum Number
of Drives
SCSI I 6 m 12 m 7
Fast SCSI 6 m 12 m 7
Fast Wide SCSI 6 m 12 m 15
Ultra SCSI 1.5 m 12 m 7
Ultra SCSI 3 m 12 m 3
Wide Ultra SCSI 12 m 15
Wide Ultra SCSI 1.5 m 12 m 7
Wide Ultra SCSI 3 m 12 m 3
Ultra 2 SCSI 25 m 1
Ultra 2 SCSI 12 m 7
Wide Ultra 2 SCSI 25 m 1
Wide Ultra 2 SCSI 12 m 15
SCSI Bus Widths and Maximum Throughput
SCSI Standard SCSI Bus Width SCSI Throughput
SCSI I 8 bits 5 MB/s
Fast SCSI 8 bits 10 MB/s
Fast Wide SCSI 16 bits 20 MB/s
Ultra SCSI 8 bits 20 MB/s
Wide Ultra SCSI 16 bits 40 MB/s
Ultra 2 SCSI 8 bits 40 MB/s
Wide Ultra 2 SCSI 16 bits 80 MB/s