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Course 2: SCSI School

Chapter 4: SCSI Signals

Types of SCSI Signals:

  • Single Ended (SE)
    Most SCSI devices use "normal" SE signaling, which limits the maximum length of a SCSI bus to 1.5m (4.9ft).This includes most 50-pin (Narrow) SCSI devices such as scanners and Zip drives.
  • High Voltage Differential (HVD) (also known as "Differential")
    A Differential SCSI system provides reliable signaling in high noise environments over a long bus length (up to 25m [82ft]). HVD hardware cannot be mixed with other SCSI signal types. A Differential bus requires Differential terminators.
  • Low Voltage Differential (LVD)
    A typical multimode LVD/SE SCSI system provides a moderately long bus length (up to 12m [39ft]) and downward compatibility with SE hardware. LVD-rated equipment is required for "Ultra" SCSI standards.

 

Next — Chapter 5: SCSI Types & Specifications