CertiGuide to A+ (A+ 4 Real) - 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’	Half-Pitch DB-68
	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’	Half-Pitch DB-68, Very High Density Centronics 68, SCA-80

SCSI Connectors

RAID

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