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- Path: giskard.demon.co.uk!dale
- From: dale@giskard.demon.co.uk (Dale Shuttleworth)
- Newsgroups: comp.dcom.modems
- Subject: Re: Is USR going to support 42bis+ on future courier upgrades?
- Date: Mon, 25 Mar 1996 19:08:02 GMT
- Organization: Dale's home Linux box.
- Message-ID: <Dou7tE.FG@giskard.demon.co.uk>
- References: <4j0091$pli@nnrp1.news.primenet.com> <4j1phk$v0k@seminole.gate.net> <4j2fv1$8kf@nnrp1.news.primenet.com>
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- X-Newsreader: TIN [UNIX 1.3 950824BETA PL0]
-
- Hi,
-
- Bob Nixon (bigrex@primenet.com) wrote:
- : Not to sound sarcastic but your not really saying anything new. I use a
- : corel.cdr file to check my providers DTE honesty factor and max or nearly
- : max the 115200 dte. What I was eluding to, is there some new compression
- : scheme that actually is able to compress "TEXT" files to twice as fast. Or
- : say a text file that goes through at say 7800 or 2x 3900, hense 2:1
- : compression. My question was is this new v.42bis+ standard capable of
- : compressing at 4:1 vs 2:1 for speeds of 15600cps or roughtly 156000bps or
- : greater. My guess is probably no as on the fly disk compression seldom
- : exceeds say 2.5:1 compression ratio for text files. If the 8:1 potential
- : was a reality that would really be a boost to v.34 modems. Win-95 and
- : probably others OS's support dte's at the serial ports of up to 960000bps.
- : Whether the current crop of 16550 uart's are up to the tast is yet another
- : question.
-
- There is no V42bis+. Text compresses about 2.5:1 with most V42bis
- implmentations. If you are talking about Hayes larger dictionary
- size V42bis then yes, it will give you a slight improvement, perhaps
- you'll now get 2.7:1 compression. Of course, PKZIP will get you at
- least 3:1 compression.....
-
- If you are fully occupying a serial port running at 115200bps with a
- V34 modem, then it may be that Hayes modems (at both ends of course)
- with their silly 230400bps seril port speed will be useful to you.
- Personally, I would compress the data first with PKZIP, gzip or
- whatever and save myself a lot of money.
-
- Dale.
- --
- ******************************************************************************
- * Dale Shuttleworth *
- * Email: dale@giskard.demon.co.uk *
- ******************************************************************************
-