| |
Interfaces:
Low Voltage Differential (LVD)
| SCSI: |
Small
Computer System Interface |
| LUN: |
Logical
Unit Number |
Also
known as Ultra2 SCSI, LVD is the latest arrival to the stable of
SCSI standards, combining the higher data integrity, longer cabling,
and reduces interference advantages of High
Voltage Differential SCSI (HVD), with the simpler design and lower
manufacturing costs of Single-Ended SCSI (SE) .
In an LVD physical interface, each signal has a dedicated return
conductor to ensure signal integrity and reduce interference. This
is in direct contrast to a single-ended interface devices. A differential
signaling is generated by a balanced LVD driver whereby each SCSI
signal has a plus signal (+) on one conductor and its exact complement
minus signal (-) on the other conductor. The LVD driver works to
either assert a signal (when it pushes current to the positive signal
or pulls current from the negative signal) or negates a signal when
it pulls current to the positive signal and pushes current from
the negative signal.
LVD signaling is inherently less noisy than single-ended signaling
and this improved stability offers many I/O system benefits including
greater cable distances, more device connectivity, and faster data
transfer rates. Introduced initially at a marginal increase cost
to the user, Ultra2's rapid acceptance and availability has stabilised
prices quickly to the level of previous generation single-ended
devices.
Related
topics:
|
