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- Path: FreeNet.Carleton.CA!an171
- From: an171@FreeNet.Carleton.CA (Anthony Hill)
- Newsgroups: comp.dcom.modems
- Subject: Re: Is USR going to support 42bis+ on future courier upgrades?
- Date: 23 Mar 1996 23:09:20 GMT
- Organization: The National Capital FreeNet
- Sender: an171@freenet2.carleton.ca (Anthony Hill)
- Message-ID: <4j20b0$b37@freenet-news.carleton.ca>
- References: <4j0091$pli@nnrp1.news.primenet.com>
- Reply-To: an171@FreeNet.Carleton.CA (Anthony Hill)
- NNTP-Posting-Host: freenet2.carleton.ca
-
-
- Bob Nixon (bigrex@primenet.com) writes:
- > I'm wondering if USR will come up with a V.42bis+(230,000 dte 8:1
- > compression) on the couriers? Is this just a sales gimmick? Can you
-
- It's mostly a sales gimmick. While 230.4kbps DTE speeds can
- improve things a little bit, the advantage is very small in the real
- world. Increaseing the memory for the v.42bis dictionary can make an
- improvment though (that is the one of the big reasons why Hayes/PPI modems
- do well on compression test, they use 8k of memory vs. 2k in most other
- modems).
-
- > actually get twice the compression on say text files 2.5:1 to say 5:1? If
-
- Now, it would be more like going from 2.5:1 to 2.6:1.
-
- > this is possible it would seem with V.34+ and V.42bis+ and given the fact
-
- FWIW, there really is no "v.42bis+" (actually, to get real picky
- there's no such thing as v.34+ either, it's just a nick-name). It's just
- regular old v.42bis being run with on a modem with a higher max. DTE rate.
-
- > that most current ISDN setup's don't support compression it could give
- > Analog modems a more competitive edge against ISDN. Text throughputs in
- > the 13 to 20k bytes/sec would be great if this isn't just a smoke screen.
-
- Unfortunatly it is mostly a smoke screen, and besides, a lot of
- data that you're likely to send will be pre-compressed (or only slightly
- compressible), so ISDN will still be considerably faster (not to meantion
- having lower latency).
-
- Anthony
-
- --
- Anthony Hill | an171@FreeNet.Carleton.CA
-