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000321_news@newsmaster….columbia.edu _Sat Mar 21 14:40:29 1998.msg
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From: fdc@watsun.cc.columbia.edu (Frank da Cruz)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: is this a kermit problem?
Date: 21 Mar 1998 19:40:26 GMT
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In article <890506921.538105@iris.nyx.net>,
arthur wouk <awouk@syzygy.nyx.net> wrote:
: >: running solaris2.4 on a sparc2, with the lates version of C-Kermit
: >: (6.0?). i have set up kermit and the port at 38,400. i am dialing in
: >: to an ISP which supports up to 56k. i am using a suprafax 28.4k
: >: modem.
: >:
: >: i connect ok, but at 26k. then the two modems go into a mating dance
: >: during which i seem to be able to get only a few characters at a time
: >: into thesystem.
: >:
: >The characters that do arrive: are they the ones you expect?
:
: yes
:
: >: the modem keeps cycling through mysterious modes, till
: >: eventually, either i lose carrier, or they two modems agree on 28.4k,
: >: after which everything is fine. this wait can take up to several
: >: minutes.
: >:
: >: anyone have any ideas as to how to shorten this speed matching dance?
: >:
: >This is a matter between the two modems and has nothing to do with Kermit,
: >except insofar as it might be affected by changing the initialization string
: >given to the modem by Kermit. But you didn't say how you were using the
: >modem. Did you "set modem type supra", "set speed 38400", and the "dial"?
:
: i can't set modem type supra, because the ISP doesn't have such a type
: in his library.
:
You said: "running solaris2.4 on a sparc2, with the lates version of C-Kermit
(6.0?). i have set up kermit and the port at 38,400. i am dialing in
to an ISP which supports up to 56k. i am using a suprafax 28.4k modem."
So you are running C-Kermit 6.0 and you are using to dial a Supra modem,
right? So, again, tell C-Kermit to "set modem type supra". This tells
C-Kermit what kind of modem you have so it will know how to initialize it
and dial it correctly. This has nothing to do with your ISP or its library.
: i will try again with that type, but as i recall, it
: could enver conenct successfully. i now use type hayes,which is
: recognized.
:
$ kermit
C-Kermit 6.0.192, 6 Sep 96...
C-Kermit>set modem type ? modem type, one of the following:
att-dataport digitel-dt22 motorola-fastalk supra <-- Note
att-dtdm gateway-telepath multitech telebit
att-isn gdc-212a/ed mwave unknown
att-switched-net hayes-1200 none user-defined
att-7300 hayes-2400 old-telebit usrobotics
boca hayes-high-speed penril ventel
cardinal intel ppi zoltrix
cermetek itu-t-v25bis racalvadic zoom
concord maxtech rockwell-v32 zyxel
df03-ac microcom-at-mode rockwell-v32bis
df100-series microcom-sx-mode rockwell-v34
df200-series microlink rolm-dcm
C-Kermit>exit
$
: >The initialization commands used by Kermit in the dialing process are
: >fairly standard, and work in most cases. But as you know, it takes two
: >modems to make a connection. And modems are becoming more and more
: >complex, and differences between brands and models result in ever more
: >scenarious like the one you've described. The procedure for negotiating a
: >mutually agreeable modulation speed and set of protocols is, indeed,
: >working, but it's taking longer than you want. To improve the situation,
: >you'll need to:
: >
: > a. Read your modem manual in depth and experiment with different settings.
: >
: > b. Call different phone numbers and see if you can narrow down the problem.
: > Does the problem occur only when you call a particular number, or does
: > it always happen?
:
: on three different numbers! if i only try to get in at 19200, it always
: works. :-(
:
First try setting the modem type correctly as described above (and in the
manual). If that doesn't work, then follow the instructions above, or read
the C-Kermit manual for an in-depth treatment of modem problems and how to
solve them.
If the problem happens with every number you call, it is almost certainly
due to the fact that you are not telling C-Kermit that you have a Supra modem,
so C-Kermit is not configuring it correctly -- how could it if it doesn't
know what it is?
If everything works well at 19200 but works poorly at 38400, then perhaps
this is a limitation of the serial port on your Sparc 2. But more likely, it
is the result of the fact -- again -- that you have not told Kermit what kind
of modem you have. If it knows you have a Supra, it will use hardware flow
control. If it thinks you have a Hayes ("set modem type hayes" means Hayes
1200 or Hayes 2400), it will not use hardware flow contol because those
modems don't support it.
This is all explained in the early chapters of "Using C-Kermit".
- Frank