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Path: utzoo!linus!decvax!tektronix!teklds!athena!steved
From: steved@athena.UUCP (Steve Dum)
Newsgroups: net.dcom
Subject: Re: interactive (host=>PC) data compression wanted
Message-ID: <422@athena.UUCP>
Date: Mon, 7-Oct-85 18:51:52 EDT
Article-I.D.: athena.422
Posted: Mon Oct  7 18:51:52 1985
Date-Received: Wed, 9-Oct-85 05:27:59 EDT
References: <294a86e4.8e4@apollo.uucp> <823@vortex.UUCP>
Reply-To: steved@athena.UUCP (Steve Dum)
Organization: Tektronix, Beaverton OR
Lines: 15
Summary: 


>>I was involved in work in this area some years ago.  In practice, don't
>>expect more than about 30-40% compresson on typical text--this goes
>> ...
>>--Lauren--

I know of one company now selling compression boxes that go on each end of
the data line before the modem that are managing compression rations of
2.5 to one for typical text.  Here typical means things like c program 
source, man pages or prose.  I haven't seen any data for what their algorithm
might do for edit sessions.  However if the edit session is highly interactive
most of the time is due to turnaround rather than baud rate.  

I believe they sell a z80 based black box for under $1000.  Its from
Adaptive Computer Technology 408-279-3993.