Adaptec AHA-2920 Manuel d'utilisateur télécharger pdf (Page 6)

Types of SCSI Signals

There are three distinct types of SCSI signals:

1. 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.

2. 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.

3. 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.

What is SCSI?

General SCSI Specifications

What is an SCA / RAID connector?

Types of SCSI Signals

Rules for Connecting SCSI Devices

Back to SCSI School Main Page

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Adaptec AHA-2920 Manuel d'utilisateur Page 6