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000247_news@newsmaster….columbia.edu _Wed Aug 27 11:02:02 1997.msg
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From: fdc@watsun.cc.columbia.edu (Frank da Cruz)
Newsgroups: comp.protocols.kermit.misc,comp.unix.questions,comp.unix.admin,comp.unix.misc,comp.unix.ultrix,comp.unix.shell
Subject: Re: Do not get connected at 33.6K
Date: 27 Aug 1997 15:01:58 GMT
Organization: Columbia University
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References: <5tsn5b$o9q@newslink.runet.edu> <5tupoe$gra$1@apakabar.cc.columbia.edu> <5u0g7d$f6o@newslink.runet.edu>
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In article <5u0g7d$f6o@newslink.runet.edu>, I l y a <ibelooze@runet.edu> wrote:
: Frank da Cruz (fdc@watsun.cc.columbia.edu) wrote:
: : You need a "set modem type ppi" command before your "set line" command.
: : This causes C-Kermit 6.0 to adjust its many of its communications settings
: : to the modem -- flow control, speed buffering, etc, and of course, also
: : allows C-Kermit to open the device even though it is not yet asserting CD.
: : (In Ultrix this might not be an issue, but it is in System V and POSIX
: : based UNIX versions).
:
: OK, I downloaded c-kermit 6.0 from the page you indicated. I changed the
: speed to 38400 and I connect at that speed, but the screen is badly
: messed up, which suggests a control flow problem. What modem type should
: I put there? I have Practical Peripherals 33.6 Mini Tower modem.
:
If it is a Practical Peripherals modem, then you should use:
set modem type ppi
: The following generate errors:
:
: set flow-control rts/cts
: set flow xon/xoff
:
: The OS is Ultrix 4.4
:
RTS/CTS is the only kind of flow control that really works on a high-speed
modem connection, but Ultrix does not support it. Therefore you have to use
Xon/Xoff. But Xon/Xoff (a) has latency, and (b) is subject to loss or
corruption. The VERY BEST that you can do is to ensure that Xon/Xoff is
enabled LOCALLY between your Ultrix system and the modem it is attached to,
NOT end-to-end between Ultrix and the computer all the way at the other end
of the connection. This means you must configure your modem for LOCAL
Xon/Xoff flow control. Again, please read "Using C-Kermit" on this topic.
It explains it all for you in great detail.
- Frank