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Table Of Contents  CertiGuide to A+ (A+ 4 Real)
 9  Chapter 10: The Small Computer System Interface, SCSI

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Parallel SCSI Standards and Features

Table 20 summarizes the current conventional (parallel) SCSI standards and shows their most important specifications, including the bus type they usually use.


Table 20: Current Parallel SCSI Standards

Type

Bus Width

Maximum Clock

Burst Transfer Rate

Number of Devices

Bus Type

SCSI-1

8 bits

5 MHz

5 MB/s

8

SE

SCSI-2 Fast Narrow

8 bits

10 MHz

10 MB/s

8

SE

SCSI-2 Fast Wide

16 bits

10 MHz

20 MB/s

16

SE

SCSI-2 Dif-ferential Narrow

8 bits

10 MHz

10 MB/s

8

HVD

SCSI-2 Dif-ferential Wide

16 bits

10 MHz

20 MB/s

16

HVD

SCSI-3 Ultra Nar-row

8 bits

20 MHz

20 MB/s

8

SE

SCSI-3 Ul-tra Wide

16 bits

20 MHz

40 MB/s

16

SE

SCSI-3 Ul-tra2

16 bits

40 MHz

80 MB/s

16

LVD

SCSI-3 Ul-tra3

16 bits

40 MHz

160 MB/s

16

LVD


Table 21 show cabling specifications for various parallel SCSI standards and types.


Table 21: Parallel SCSI Cable Lengths

Type

Maximum Clock Rate

Maximum Bus Length

Minimum Distance Between Devices

SCSI-1

5 MHz

6 Meters

30 cm

SCSI-2 (Single Ended)

10 MHz

3 Meters

30 cm

SCSI-2 (Differential)

10 MHz

25 Meters

30 cm

SCSI-3 (Ultra)

20 MHz

1.5 Meters

30 cm

SCSI-3 Ultra2 & Ultra3 (LVD)

40 MHz

12.5 Meters

30 cm

Quick navigation to subsections and regular topics in this section



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