Path: utzoo!attcan!uunet!wuarchive!usc!ucsd!ucbvax!unisoft!hoptoad!hsfmsh!daemon
From: tnixon@hsfmsh.UUCP (Toby Nixon)
Newsgroups: comp.dcom.modems
Subject: Re: 4800 baud modems
Message-ID: <3092@hsfmsh.UUCP>
Date: 28 May 90 18:17:26 GMT
Sender: daemon@hsfmsh.UUCP
Organization: Hayes Microcomputer Products, Inc.  Norcross, Georgia
Lines: 38

In article <1111100006@cdp>, caulkins@cdp.UUCP writes:

- I'm looking for a 4800 baud modem.  My brief research indicates
- this is a strange (and maybe non-existent) beast.  Lots of 2400s,
- quite a few 9600s, but no 4800s that I've been able to locate
- in a day's poking around in trade pub ads.  Any suggestions
- or names of manufacturers would be much appreciated.

There are several different kinds of 4800bps modems.  The most 
popular in the USA is the Bell 208; it comes in a half-duplex 
version for two-wire lines, and a full-duplex version for four-wire 
leased and private lines; it can't run full-duplex on dial-up lines. 
CCITT V.27 modems are very similar.  

CCITT V.32 also runs at 4800 in addition to 9600, full duplex on 
dial-up lines.  When V.32 was first standardized in 1984, a few 
companies made 4800-only modems, but these days you just don't find 
them; they all have 9600, and will interwork with 4800-only V.32 
modems.  

I think you'll find that 4800bps modems won't be much, if any, 
cheaper than 9600s.  You certainly won't find any that "split the 
difference" between the street prices of 2400 and 9600 modems.

Be careful not to be misled by ads for "4800 baud" modems that are 
really 2400bps modems with MNP5.  These will only achieve 4800 with 
certain kinds of (very compressible) data.

	-- Toby

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Toby Nixon, Principal Engineer     Fax:    +1-404-441-1213  Telex: 6502670805
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