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From: lron@easy.hiam (Dwight Hubbard)
Newsgroups: comp.sys.amiga.datacomm
Subject: Re: Telebit vs. USR
Message-ID: <188630d2.ARN0a34@easy.hiam>
Date: 15 Jan 91 01:58:26 GMT
References: <1991Jan15.021116.23778@athena.mit.edu>
Reply-To: lron@easy.hiam
Followup-To: comp.sys.amiga.datacomm
Organization: You must be talking about someone else.
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In article <1991Jan15.021116.23778@athena.mit.edu>, Richard L. Carreiro writes:

>
> Ok, a few questions....
> A) what are V.32, V.32bis, V.42, and V.42bis

V.32 Full duplex, 9600bps, Ansynchrouns/synchrouns (9600 both send and receive
at the same time, with or without start and stop bits)

V.32bis same as V.32 except runs at 14.4Kbps.

V.42 Error detection/correction protocol, includes MNP levels 1-4.

V.42bis Compression, currently sits on top of V.42 protocol.  Unlike MNP-5
compression V.42bis does not slow down throughput on compressed files.

> B) which of these does Telebit support?

Telebit makes several different models of modems, All the new telebit modems
have V.42/V.42bis/MNP-5 (I think, I could be wrong), Only their V.32 modem
and the T2500 have V.32.  Telebit does not make a V.32bis modem yet since
V.32bis has not been through it's final approval yet and could change.

> C) which of these does USR support?

USR also makes several different models of modems, All the new USR modems
support V.42/V.42bis/MNP1-5,  Only their V.42 modem and the Dual Standard
support V.32, the newer Dual Standard models support V.32bis (as the standard
stands at this point, compatibility if the standard changes is another story)

> D) does Telebit support any MNP stuff?  Does USR?

Both up to MNP-5, very few modem manufactures make modems that support
MNP levels above 5.  Also, note that MNP1-4 are a subset of V.42.

> Much thanks, as a Telebit or USR purchase is in my
> immediate future, and I'm trying to decide which to get...

Take a look at some of the newer V.32 modems, the mail order prices on some
of them are as low as $450 which is less than the famous USR sysop price for
the HST 14.4.
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