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- Path: news.gate.net!not-for-mail
- From: dhaire@gate.net (doug haire)
- Newsgroups: comp.dcom.modems
- Subject: Re: Is USR going to support 42bis+ on future courier upgrades?
- Date: 27 Mar 1996 07:04:42 -0500
- Organization: CyberGate, Inc.
- Message-ID: <4jbasq$102o@navajo.gate.net>
- References: <4j2fv1$8kf@nnrp1.news.primenet.com> <4j2iun$a3t@newsbf02.news.aol.com> <4j3r1f$1tc4@seminole.gate.net> <4j468j$gg1@drencrom.insync.net> <4j68or$nug@navajo.gate.net> <4j7iai$qcc@drencrom.insync.net>
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-
- Greg Bretting (bretting@insync.net) wrote:
- : On 25 Mar 1996 08:57:47 -0500, dhaire@gate.net (doug haire) wrote:
- :
- : >Greg Bretting (bretting@insync.net) wrote:
- : >: On 24 Mar 1996 10:51:11 -0500, dhaire@gate.net (doug haire) wrote:
- : >:
- : >: >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.
- : >:
- : >: I don't think the errors you were seeing were the fault of MS-DOS... I've
- : >: transferred hundreds of megs of data between DOS machines using LapLink and
- : >: a null modem cable @115200 and have never had a problem.
- : >
- : >Apples and oranges.
- :
- : How so?
- :
- : >How many times have you used LapLink to transfer files from a remote
- : >(in some other physical location) computer? How about never?
- :
- : What does _that_ have to do with anything? You said above that you were
- : using a null modem cable, and if that's the case then my LapLink example is
- : perfectly valid because it's essentially the same setup except for
- : different application software being used.
-
- Bingo! The same thing EXCEPT for the software involved. You are using
- software designed to dedicate all of the CPU to the task. That's why I
- said apples and oranges.
-
- : >Come back to reality... Using LapLink on a null modem connection
- : >between two co-located computers is not using the standard DOS platform.
- :
- : What the hell are you talking about? How is using LapLink on two different
- : DOS 6.20 machines over a null modem connection "not using the standard DOS
- : platform"? In my case, the software in question is LapLink Pro 4.0c -
- : which is a DOS-only app. This is not cutting-edge stuff, Doug - people
- : have been doing this for years.
-
- If you don't understand the difference between using LapLink and running
- a comm program protocol on a null modem cable at full speed then you
- aren't grasping the concept.
-
- : >: >When the common computer software platform is capable of handling 115200
- : >: >properly perhaps we can then consider the 230k UART speed.
- : >:
- : >: Well, DOS 6.2 is pretty common, and I know that I've been able to (almost)
- : >: saturate the port at 115200 without any errors. Here's a log from one such
- : >: test using QModem Pro for DOS, a Courier V.34 external, and plain 16550
- : >: UART:
- : >:
- : >: 22:40:52 09-14-95 Online Timer Started
- : >: 22:42:00 09-14-95 Download File(s). Protocol : Zmodem
- : >: 22:42:01 09-14-95 ++ File 1MEGTEST.RUN
- : >: 22:43:34 09-14-95 ++ End of file
- : >: 22:43:34 09-14-95 ++ Chars Per Second : 11272
- : >: 22:43:34 09-14-95 ++ Effective Percent : 0%
- : >: 22:43:40 09-14-95 Elapsed Online 00:02:48
- : >
- : >Sure and I have also. In fact, I posted several articles showing this on
- : >transfers between computers over phone lines and modems. That's not, of
- : >course, what I was talking about here and it has little to do with my point.
- :
- : Then I obviously am missing your point; I interpreted it to be that you
- : felt 115200 DTE rates were unworkable on DOS platforms, let alone 230,400,
- : and that discussion of DTE rates > 115200 were pointless since 115200
- : didn't work very well on most platforms. I then provide two examples, one
- : using a null modem connection and another a dial-up session with an
- : external modem, that seem to contradict what you are saying.
-
- No, I offered that 115200 DTE rates were more than adequate for current
- operating system platforms in the real world. That having a port set to
- 230k (and a modem that would accept that) is unnecessary and simply
- advertising hype.
-
- You offered a link using a specialized piece of software as a counter to
- this. Different game.
-
- : Not only that, but I know for a fact that I can connect two modems to _one_
- : DOS machine and pass data full-duplex (simultaneous send and receive of the
- : same file) between the ports at 115200 without errors. This is normally
- : how I run throughput testing on modems, using SoftArt's HowFast v1.65
- : testing software running under DOS, on a wide variety of machines.
-
- How do you connect two modems and pass data at 115200 between them?
- Answer: you don't. You pass data from a port to a modem on one end and
- from a modem to a port on the other at that speed; between the modems,
- you are limited to the DCE rate of the modems.
-
- : Doug, I didn't just start doing this stuff yesterday - I know for a fact
- : that MS-DOS is perfectly capable of supporting 115200 DTE rates, and I've
- : demonstrated that on dozens of machines and literally hundreds of modems
- : during the course of testing these things, using all sorts of software, and
- : I know that it works.
-
- Good, then you can simply ignore what I said and hit Enter. Or you can
- discuss this without bringing in specialized software designed to
- overcome DOS's limitations.
-
-
-