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000234_news@columbia.edu_Sun Jun 28 04:13:15 1995.msg
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From: les@MCS.COM (Leslie Mikesell)
Newsgroups: comp.dcom.modems,comp.protocols.kermit.misc
Subject: Re: Improved modem dialing for C-Kermit
Date: 27 Jun 1995 23:13:15 -0500
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Message-Id: <3sqksr$g8l@Mercury.mcs.com>
References: <3seuml$4s6@apakabar.cc.columbia.edu> <3sft9o$8ul@Mars.mcs.com> <DAtBI5.36y@bokonon.uucp>
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In article <DAtBI5.36y@bokonon.uucp>,
Stephen M. Dunn <stephen@bokonon.UUCP> wrote:
>In article <3sft9o$8ul@Mars.mcs.com> les@MCS.COM (Leslie Mikesell) writes:
>$Why not teach it to read uucp Devices and Dialers files on the unix
>$version at least? Everyone has to set these up anyway and it's
>$annoying to have to do it all over again for kermit and add a
>$start up script that knows how to find a free modem line.
>
> You'd be surprised, actually, at how many people _don't_ set
>these up, and go through life expecting that the modem will just
>work optimally without any setup if it's used only for dial-in.
>I've seen more than one >9600 bps modem used as a 9600-only
>modem because someone didn't know that you could set up the OS
>to do better, noticed in the manual that the modem defaults to
>9600 bps DTE rate when powered on, and just left it like that.
>I've also seen a 9600 bps modem configured to use a hayes2400
>dialer, again due to lack of knowledge on the part of the person
>who set it up.
Actually most modern modems can use a hayes2400 dialer, *if* you
manually configure its settings and store the correct defaults.
This, by the way, is a very good reason to keep a copy of kermit
around on every unix machine. It is generally difficult to impossible
to chat with modems that don't have carrier detect up using the
stock unix programs. I keep scripts around to initialize all my
modems for bidirectional use (no echo, no result codes, actual
carrier detect, reset on DTR drop, etc.) so I can run them easily
whenever I swap a modem or suspect it isn't set right.
> As for dial-out, I think C-Kermit probably needs more information
>than just "how UUCP or cu dials out" and "how to reset the modem
>for dialin". For example, of all the stuff it finds, how does it
>know which bits enable or disable error control, data compression,
>how flow control is set, etc.?
Unless your unix ports can't handle hardware flow control you are
almost always better off locking the computer<->modem speed at
the highest they can handle well and letting the modem negotiate
the details of how to deal with the other end. But, the HDB
files allow you to specify 'classes' of modems instead of
just speeds. For example you might list a port as being
an X38400 class as well as another entry that specified N38400,
and the different entries could link to different dialer scripts
regardless of whether you had two different devices or not, so
by selecting a particular class you can initialize the modem
as needed for the connection.
> Throw in the fact that there isn't just one standard format
>for these (I believe pre-HDB UUCP used a different format; I've
>never used Taylor UUCP so I can't say if it does or not) and it
>gets more difficult to fish this stuff out.
HDB is the only version that provides enough information to be
usable for anything but the simplest situations (and Taylor is
able to use the HDB files as well as its own variation).
Les Mikesell
les@mcs.com