Course 2: SCSI School
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
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