Single-Ended And Lvd Scsi Buses; Maximum Cable Length For Scsi Standards; Scsi Bus Widths And Maximum Throughput; Table 1-1. Maximum Cable Length For Scsi Standards - Dell PowerEdge Expandable RAID Controller 3 User Manual

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PERC 3/SC has one ultra-high-density 68-pin external connector for the
external storage subsystem and one high-density 68-pin internal connector.

Single-Ended and LVD SCSI Buses

The SCSI standard defines two electrical buses: a single-ended bus and an
LVD bus. PERC 3 supports both standards.

Maximum Cable Length for SCSI Standards

Table 1-1 displays the maximum length of cable that you can use for various
SCSI standards.
Ta b l e 1 - 1 . M a x i m u m C a b l e L e n g t h f o r S C S I S t a n d a r d s
SCSI Standard Single-ended
SCSI I 6 m
Fast SCSI 6 m
Fast Wide SCSI 6 m
Ultra SCSI 1.5 m
Ultra SCSI 3 m
Wide Ultra SCSI N/A
Wide Ultra SCSI 1.5 m
Wide Ultra SCSI 3 m
Ultra 2 SCSI N/A
Ultra 2 SCSI N/A
Wide Ultra 2 SCSI N/A
Wide Ultra 2 SCSI N/A

SCSI Bus Widths and Maximum Throughput

Table 1-2 displays the SCSI bus widths and maximum throughput for each
of the SCSI standards.
LVD Maximum # of
Drives
12 m 7
12 m 7
12 m 15
12 m 7
12 m 3
12 m 15
12 m 7
12 m 3
25 m 1
12 m 7
25 m 1
12 m 15