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Appendix B SCSI Configuration Guide

SCSI Cables

Quantum DAT 160 User’s Guide 62

• With single-ended (SE) SCSI, each signal travels over a single wire

and each signal's value is determined by comparing the signal to a

paired ground wire. Signal quality tends to decrease over longer

cable lengths or at increased signal speed.

• With low voltage differential (LVD) signaling, signals travel along

two wires and the difference in voltage between the wire pairs

determines the signal value. This enables faster data rates and longer

cabling with less susceptibility to noise than SE signaling and

reduced power consumption.

If you use LVD SCSI devices on the same bus as single-ended devices this

will switch the LVD SCSI host adapter into single-ended mode and

restrict cable length.

If you connect only LVD SCSI devices, the bus will operate in low voltage

differential mode and Ultra160 speeds will be enabled. You can use a

combination of Ultra160 and Ultra2 devices. Each device will operate at

its optimum speed.

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Quantum DAT 160 Guía de usuario Pagina 76