Note On Se And Lvd Interfaces - Tandberg Data DAT 160 User Manual

Scsi tape drive

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Chapter 8–SCSI configuration guide

Note on SE and LVD interfaces

DAT SCSI Tape Drives

SE and LVD define how the signals are transmitted along the cable.

•

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 con-

sumption.

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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