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- Path: news.primenet.com!not-for-mail
- From: bigrex@primenet.com (Bob Nixon)
- Newsgroups: comp.dcom.modems
- Subject: Re: Is USR going to support 42bis+ on future courier upgrades?
- Date: 24 Mar 1996 19:59:01 -0700
- Organization: primenet.com
- Sender: root@primenet.com
- Message-ID: <4j525l$mi5@nnrp1.news.primenet.com>
- References: <4j2fv1$8kf@nnrp1.news.primenet.com> <4j2iun$a3t@newsbf02.news.aol.com> <4j3r1f$1tc4@seminole.gate.net>
- X-Posted-By: ip209.phx.primenet.com
- X-Newsreader: WinVN 0.99.2
-
- Win-95 can do 10-11k/sec or max out the 115200 dte without com overruns
- even when do heavy multitasking. Actually Win-95 can support DTE's of up
- to 960000. I have mine set for 230000 for all the good that does. My high
- priced courier has a max dte of 115200.
-
- Incidently for the fellow who posted the article about the ultra high
- speed modems he sells or builds. That is what this tread was started by me
- about. Couriers won't support highter than 115200 and in reality are
- really no better than USR Sportsters at handling highly compressable
- files.
-
-
- In article <4j3r1f$1tc4@seminole.gate.net>, dhaire@gate.net says...
- >
- >RobertN141 (robertn141@aol.com) wrote:
- >: I find this information very interesting. My company manufactures the
- >: AMQUEST HyperModem V.34. This product will support up to 230,000 BPS
- >: throughput and has a enhanced microcontroller architecture to better
- >: compress
- >: and decompress data. The fundamental problem with many modems is that
- >: they are all rated 28.8 V.34 115,200 max. However, they lack the
- >: horsepower
- >: to handle above 88,000 bps throughput. Since in the past many people
- were
- >
- >More hype.
- >
- >Listen, first of all, I'd say V.34 modems (and even V.32bis modems) are
- >fully capable of handling a throughput speed above 88k. In fact, I know
- >this is true. Second, I'd like to point out that comm overruns are a
- >fault that lies with the operating system software of the CPU. I recently
- >tested this on a comparison with a large file and two different platforms
- >(MS-DOS and Linux) on the same CPU. The sender was a 486dx4/100 CPU
- running
- >MS-DOS and using a USR Courier V.34 v.everything. The receiver was a
- >486sx33 with another Courier (same model) running linux and MS-DOS
- >(separate partitions, dual boot). Modems were connected via an 8 ft
- >telephone cable and synched at 33,600 bps with V.42 LAPM and V.42bis
- >compression.
- >
- >The linux platform received the file with no errors, no comm overruns, no
- >garbled subpackets, no problems.
- >
- >The MS-DOS platform received constant errors such as comm overruns and
- >garbled subpackets.
- >
- >I also ran the tests using *no* modems (null modem cable connection at
- >115200 connection rate). The MS-DOS to MS-DOS connection was completely
- >unusable with way too many errors at the receiver. The MS-DOS to linux
- >connection was stable and never showed an error.
- >
- >When the common computer software platform is capable of handling 115200
- >properly perhaps we can then consider the 230k UART speed.
- >
- >
-
-