Logic MegaRAID SCSI 320-1 RAID Controller User's Guide

Single-Ended and Differential SCSI Buses 1-3
Copyright © 2002 by LSI Logic Corporation. All rights reserved.
1.5 Single-Ended and Differential SCSI Buses
The SCSI standard defines two electrical buses:
· Single-ended bus
· Low-voltage differential bus
1.6 Maximum Cable Length for SCSI Standards
Table 1.1 lists the maximum SCSI cable length and number of disk drives
that you can use, depending on the SCSI speeds and type of device.
Table 1.1 Maximum Cable Length for SCSI Standards
Standard
Single Ended
SCSI
Low-Voltage
Differential SCSI
Maximum # of
Drives
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
Ultra160 SCSI 25 m 1
Ultra160 SCSI 12 m 7
Wide Ultra160 SCSI 25 m 1
Wide Ultra160 SCSI 12 m 15
Ultra320 12 m 15
Ultra320 20 m 1