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Table Of Contents  CertiGuide to A+ (Core Hardware)
 9  Chapter 0101:  SCSI

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VIII  SE/HVD
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X  SCSI Generations
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IX  LVD/MSE

As SCSI moved up in speed, the cable lengths would have gotten ever shorter, as a quick review of the table above reveals. At 40MB, SE (single ended) would have been limited to just over 2 feet (.75 meters).

Something had to be done. A new option was created. Low Voltage Differential (LVD) combined the best of SE and HVD.

This eliminated the possibility of blowing up a SCSI device with high voltage, and created the possibility of cable lengths of up to 12 Meters.

Another type of LVD is known as MSE, or to be technically accurate, LVD/MSE.

This is a multimode device allowing connection of both types of drives.

It will automatically switch between an SE device and a LVD device; albeit one device at a time.

[spacer]Lowest Common Denominator

When using LVD/MSE, and the device switches are set to SE mode, all the restrictions of SE (including cable limits apply).


Ultra SCSI

All Ultra SCSI specifications require differential SCSI to be used.



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VIII  SE/HVD
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X  SCSI Generations
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