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000278_news@columbia.edu_Thu Jan 26 13:46:08 1995.msg
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(5.65c+CU/IDA-1.4.4/HLK for <kermit.misc@watsun.cc.columbia.edu>); Thu, 26 Jan 1995 08:46:18 -0500
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From: fdc@watsun.cc.columbia.edu (Frank da Cruz)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: Can't connect at 28.8 :(
Date: 26 Jan 1995 13:46:08 GMT
Organization: Columbia University
Lines: 61
Message-Id: <3g8930$nms@apakabar.cc.columbia.edu>
References: <jzeroD2x187.J3p@netcom.com>
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Apparently-To: kermit.misc@watsun.cc.columbia.edu
In article <jzeroD2x187.J3p@netcom.com>, Jim Nakamura <jzero@netcom.com> wrote:
>Whenever I connect to internet service provider, I get the message
>
> CONNECT 14400/V32/NONE
> Can't change speed to 14400
>
>I am using Kermit(190) for Linux from a 486 PC Clone, together with
>a 28.8 USR Sportster.
>
>My .mykermrc file has the following relevant lines:
>
>set delay 1 ; I escape back quickly
>set dial display on ; I like to watch C-Kermit dial
>set window 2 ; Use 2 window slots
>set block 3 ; Use 16-bit CRC error checking
>set receive packet-length 1000 ; Use 1000-character Kermit packets
>set modem sportster
>set line /dev/ttyS1
>set speed 115200
>set file type text
>set file name lit
>set dial init-string AT&F&A3&B1&H1&R2&D2&C1M0X4S0=0S7=90\{13}
>
>I copied my init string from the comm program which came with my
>modem, thinking these people knew more than I.
>
>Can anyone suggest why I am not connecting at better rates?
>
As explained in the manual (just type "help" at the C-Kermit prompt
to find out more about the manual), there are numerous ways in which
you have to get the software (Kermit in this case) and the modem to
agree. Perhaps chief among them is the treatment of the interface speed.
Modems can be configured to make their interface speed follow the
connection speed, or to keep their interface speed fixed no matter what
the connection speed turns out to be.
Modern high-speed, error-correcting, data-compressing modems should
generally be configured in the latter way: with interface speed fixed,
or locked.
You have set your modem this way (&B1), but you did not set Kermit this
way, so Kermit tried to change its interface speed to 14400 when it got
the "CONNECT 14400" message from the modem. Luckily, it could not do
this, since evidently 14400 is not a supported speed on your computer.
The trick is to tell Kermit to use the highest reliable interface speed it
and your computer and your modem all have in common, and to use RTS/CTS
"hardware" flow control if available, and then before dialing, tell Kermit
to "set dial speed-matching off". See pages 60-61 of "Using C-Kermit" for
a longer explanation.
>P.S., I noticed the above init string includes an &R2 which apparently
>means "RX to DTE/RTS high". Could someone please explain this
>jibberish? (-;
>
It probably means "don't let the modem send data to the computer unless
the computer is asserting the Request To Send (RTS) signal". That's one
half (one direction) of the bidirectional RTS/CTS flow-control regime.
- Frank