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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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Summary: SCSI Types, Standards, Speeds, Cables and Connectors

Table 23 ties together much of what we have discussed in this chapter so far, by summarizing the various SCSI types and standards, showing their maximum speeds, cable length limits and the connectors they use.


Table 23: Summary Table of SCSI Standards, Speeds, Cable Lengths and Connectors

Bus Width

SCSI Standard

Maximum Speed
(MB/s)

Maximum Cable Length

Connectors Typically Used

8-bit
(Narrow SCSI)

SCSI-1

5

6 m / 19.6’

Ribbon IDC 50, Centronics 50, DB-25, DB-50

SCSI-2

Fast SCSI,

Fast-10

 

10

3 m / 9.8’

Ribbon IDC 50, Half-Pitch DB-50

Ultra SCSI, Fast-20

20

1.5 m / 4.9’

Ultra2 SCSI

40

12 m / 39’

16-bit
(Wide SCSI)

SCSI-2,

Fast Wide SCSI, Fast-10 Wide

20

3 m / 9.8’

Half-Pitch DB-68

Ultra Wide SCSI,

Fast-20 Wide

40

1.5 m / 4.9’

SCSI-3,

Ultra2 Wide (U2W) SCSI,

Ultra2 LVD SCSI,

Fast-40 Wide

80

12 m / 39’

Half-Pitch DB-68, Very High Density Centronics 68, SCA-80

Ultra3 SCSI,

Ultra160/m

160

12 m / 39’


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