haribabu@tataelxsi.co.in (Haribabu) wrote:
Go to google.com and do a search on each.
RS-422 is like RS-232, except with balanced pair circuits for
each signal. RS-449 is similar, and specifies a DB37 connector.
V.35 is a hybrid interface, originally adopted by the CCITT for
48 Kbps groupband modems and eventually adapted for use by
anything above 20Kbps (the supposed limit on RS-232). It was
discontinued by the CCITT in 1988 and replaced by V.10 and V.11.
V.35 has balanced pairs for data and clocking (TxD, RxD, etc)
and unbalanced for modem control signal lines (DTR, CTS, etc).
The V.35 standard specifies a connector, however DB25 connectors
are also sometimes used.
V.35 is commonly used in the telecom industry, for example with
70Mhz satellite modems.
--
Floyd L. Davidson <http://web.newsguy.com/floyd_davidson>
Ukpeagvik (Barrow, Alaska) floyd@barrow.com
