29 May
2006
29 May
'06
8:35 a.m.
Brent Hilpert wrote:
Don Y wrote:
I'm not sure there even *is* a formal "High Voltage Differential"
term. Note that "Differential" was the original term applied
to EIA485 in SCSI. Thereafter, "LVD" was introduced to differentiate
it from the original "Differential".
I don't have the actual *thresholds* handy for LVD and "HVD",
but HVD has a greater common mode range than LVD. I believe
if you asked 100 people "skilled in the art" what "HVD"
meant, they wouldn't think about the voltage *difference*
but, rather, the higher supply rails used in EIA485 based SCSI
(maybe HVD should be called SCSI485?? :> )
Chris M wrote:
"High Voltage Differential" is an ambiguous phrase: it could mean a
differential pair with high common-mode voltage tolerance/rejection or it
could mean a differential pair with high differential-mode voltage swings.
"High Differential Voltage" as a shortening of "high differential-mode
voltage" is actually a more technically concise term (and is actually a better
description of the high/low distinction in the SCSI standarad).
Cris M's supposition of "High Differential Voltage" is reasonable and
valid,
both grammatically and technically, even though it may be incorrect
as far as standard SCSI terminology goes. isnt it HDV - High Differential Voltage.
Low Differential Voltage?
Light Diode Emitting?
Read Memory Only?
Cathode Tube Ray?
Liquid Display Crystal?
Central Unit Processing?