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- Path: news.gate.net!not-for-mail
- From: dhaire@gate.net (doug haire)
- Newsgroups: comp.dcom.modems
- Subject: Re: Is 33.6 only available for USR?
- Date: 2 Feb 1996 00:54:19 -0500
- Organization: CyberGate, Inc.
- Message-ID: <4es8ub$11r0@seminole.gate.net>
- References: <4dd14b$odp@grid.direct.ca> <4ddchf$c4i@shellx.best.com> <30FA9B32.4862@fishnet.net> <4dh7j3$81i@shellx.best.com> <30FCE339.36B9@fishnet.net> <4dlt8f$1qom@seminole.gate.net> <DLGM5w.H8o@freenet.carleton.ca> <4dqj68$dcak@navajo.gate.net> <eric-
- <199601310359.WAA10609@iii2.iii.net> <Pine.A32.3.91.960131004959.20602A-100000@navajo.gate.net> <eric-0202960000120001@sobt.accessorl.net>
- NNTP-Posting-Host: seminole.gate.net
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-
- Eric Shaw (eric@accessorl.net) wrote:
- : In article <Pine.A32.3.91.960131004959.20602A-100000@navajo.gate.net>,
- : doug haire <dhaire@gate.net> wrote:
- :
- : >> >{On} 08/05/94 5:49 am 26400 bps ours II 08/05/94
- : >> >Z 983040 115200 bps 11327 cps 0 errors 1 1024
- : d:/download/1x30.tst 17972
- : >> >Z 327680 115200 bps 7465 cps 0 errors 0 1024
- : d:/download/2x10.tst 17972
- : >> ...
- : >You overlook his main thrust which was that USR didn't even approach a
- : >3/1 compression. His statement that even limiting the connect rate to
- : >14400 was blatantly false and I have posted data to show that. Since only
- : >Hayes (I think, there may be one other) has the 230k DTE rate
- : >availability and damn few comm/term programs have that as a setting.
- :
- : Between most PC's with standard 16550 cards, you won't get much over 11K/s
- : even on all zero's being sent, but this is because of interupt latency and
- : time to check the Zmodem acks. You will still get at least close to it,
- : and this data DOES show a transfer over 11K/s, at 11327 cps. With
- : Ymodem-G, you'll get even closer to the 11520cps theoretical max. 11327 I
- : would say *IS* limited by the 115200 DTE, although 7465 cps transfers may
- : or may not be, depending on whether the file in question was evenly
- : compressible throughout.
-
- You just posted (again) a claim that USR could not even do what I clearly
- show was done. You claimed a maximum of 6k/s at 14400 but now "fudge" on
- this below...
-
- : >> But locking the modems at 14.4k clearly has no direct bearing on this,
- :
- : Locking the modem at 14.4K shows that not only can the modem acheive
- : better than 4:1 compression, but if the DTE isn't limiting it *as much* it
- : can achieve better than 7:1, possibly much more.
-
- Wrong. I am still waiting for some data to support your claims.
-
- : >inefficient, period. But his, and Hayes, claims of superior compression
- : >are false: V.42bis is a standard and all modems compress using the same
- : >algorithm.
- :
- : The algorithms *may* or may not be identical, but if they are, then the
- : processor doing the compression in a modem that can only acheive a little
- : over 6K/s is obviously slower than in one that is limited by the 115200
- : DTE on the same file, unless there are other ridiculously high latencies
- : in the slower modem.
-
- And here is where you show total ignorance. V.42bis algorithms aren't
- different, they are a standard. And, again, you now return to the "a
- little over 6k/s" when you've been shown this is untrue.
-
-
- Show some data or expect a lot of flak about this.
-
- --
- "Things are more like they are now than they ever were before."
- [Dwight D. Eisenhower]
-