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- Path: in1.uu.net!oronet!usenet
- From: estarry@oro.net (Ed Starry)
- Newsgroups: comp.dcom.modems
- Subject: Re: v34 speed on txt files???
- Date: Mon, 18 Mar 1996 03:56:22 GMT
- Organization: "oronet, Penn Valley, CA"
- Message-ID: <4iimcj$gj6@hg.oro.net>
- References: <4hqq0e$eqn@sam.inforamp.net> <4hr16a$bci@nntp1.best.com> <4i4rhk$672@news.ios.com> <Pine.SUN.3.91.960313071128.12637A-100000@access5.digex.net> <4i9p1b$s1e@news.ios.com> <Pine.SUN.3.91.960315115620.14771A-100000@access2.digex.net> <4ih8n0$eqq@nnrp1.news.primenet.com> <4ihj2q$rk4@news3.digex.net>
- NNTP-Posting-Host: estarry.oro.net
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-
- fairbank@access.digex.net (Eric Fairbank) wrote about {Re: v34 speed on txt
- files???} in 'comp.dcom.modems'...
-
- ~ Don't be sorry, I want more input on this. I did some testing on the
- ~"bible" file. Without compression, I got 3385cps, with compression,
- ~7680cps. That's a comression ratio of 2.26:1 I *know* that the v.42bis
- ~protocol can compress files to 4:1. Some files can go as high as 10:1
- ~and more (contrary to popular belief). I'm just disputing Mr.
- ~Kristal's claim that he *regularly* gets 10k/sec on general text
- ~files. Iv'e asked for a specific site and file name, but I guess he is
- ~unwilling to back up his claim. His test file is useless for real
- ~world comparisons. I would like to see 3:1 or 4:1, as a test for my
- ~own modem and to just see it for myself.
-
- ~Thanks for your input
- ~Eric
- ========================
-
- You want a large real world redundant on-line file! Try
- <ftp://ftp.microsoft.com/Is-IR.txt>. I use this for a test file but always
- stop before completion, it's 7 Mg. Depending on time of day and Net traffic,
- I've seen max. throughput of 8.4 KByte/sec on this file (6-7 KByte/sec being
- the norm). With my 14.4 modem this works out to about 5.9:1 max.
- compression. LAPM supports up to 12 KByte/sec with a 14.4 modem. My ISP's
- 28.8 modems and my 14.4 modem are *both LAPM compliant* and both set at
- 115,200 bps. This is while using WfW v3.11. If I lower MSS from my normal
- 1460 to 512 this 6-7 KByte/sec rate will drop by 2-3 KByte/sec. Naturally a
- modem that only supports MNP compression or connects with a MNP modem should
- expect compression ratios proportionately lower than mine.
- The text portion of Web pages will be between 4-6 KByte/sec if it's long
- enough to get compression fired up, 15-20,000 bytes or larger.
- Two V.34/28.8-LAPM modems should easily transfer generic text files in the
- neighborhood of 19-20 KByte/sec! After all they are rated at 230,400 bps.
- Remember, no matter what type of modem you have you can never download
- faster than the other end can upload! "If you assume the other modem is
- running at 100% you will probably be 100% wrong." If my ISP was running at
- 100% then I would see 12 KByte/sec text file transfers instead of the 6-7
- KByte/sec rate I now get.
-
- Ed...
- ______________________________________________________
- ** Common Sense Is Not Common **
-
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