home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
kermit.columbia.edu
/
kermit.columbia.edu.tar
/
kermit.columbia.edu
/
newsgroups
/
misc.19971216-19980424
/
000261_news@newsmaster….columbia.edu _Mon Feb 23 10:57:34 1998.msg
< prev
next >
Wrap
Internet Message Format
|
1998-04-22
|
4KB
Return-Path: <news@newsmaster.cc.columbia.edu>
Received: from newsmaster.cc.columbia.edu (newsmaster.cc.columbia.edu [128.59.35.30])
by watsun.cc.columbia.edu (8.8.5/8.8.5) with ESMTP id KAA10647
for <kermit.misc@watsun.cc.columbia.edu>; Mon, 23 Feb 1998 10:57:34 -0500 (EST)
Received: (from news@localhost)
by newsmaster.cc.columbia.edu (8.8.5/8.8.5) id KAA23326
for kermit.misc@watsun; Mon, 23 Feb 1998 10:57:34 -0500 (EST)
Path: news.columbia.edu!watsun.cc.columbia.edu!fdc
From: fdc@watsun.cc.columbia.edu (Frank da Cruz)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: rts/cts problem
Date: 23 Feb 1998 15:57:31 GMT
Organization: Columbia University
Lines: 72
Message-ID: <6cs69b$3fs$1@apakabar.cc.columbia.edu>
References: <6cqav9$bn3@glas.apc.org>
NNTP-Posting-Host: watsun.cc.columbia.edu
Xref: news.columbia.edu comp.protocols.kermit.misc:8453
In article <6cqav9$bn3@glas.apc.org>,
Dmitry the Zuryanovich <dz@mir.glas.apc.org> wrote:
: Ckermit: 6.0.193 A.03.
: OS: SCO OSE 5.04+RSc
: Comm-Driver: SCO standart, not fas.
: Modem: DSI Connection Internal, locked at 38400, it has no problems under
: OS/2 and OpenDOS.
:
: Problem: it works great, until I do not transfer large thing from me, no
: matter what way ( except kermit protocol - it is too slow, but it helps,
: as it was designed to )
:
Kermit protocol is slow with its default tuning but you can make it as fast
as you want to. That is the main difference between Kermit and Zmodem:
Kermit is designed to work the first time, even if it is slow; Zmodem is
designed to be fast the first time, even if it does not work.
It is easy to make Kermit go faster, but it is not so easy to make Zmodem
go slower.
In case you don't have the C-Kermit manual, you can also read all about
this at:
http://www.columbia.edu/kermit/faq.html
ftp://kermit.columbia.edu/kermit/faq.txt
and in:
ftp://kermit.columbia.edu/kermit/perf.html
: Looks like:
: redir sz some_great_file.jpg
: sz: sending-sending-sending first 5K with an increadible CPS
: modem: ( generally - remote modem, tested at lot of systems) hangup.
:
This might be caused by inadequate flow control, but more likely it is caused
by the fact that Zmodem takes very few precautions about the transparency of
the connection. Many connections will hang up if certain data patterns pass
through them.
: The same thing with ppp. redir ppp rts/cts ( ppp from Morning Star
: technologies) established LCP, getting ip and works great, again, until I
: do not say ftp send smth-big. The same result.
:
: .kermrc
: set line /dev/tty1a
: set speed 38400
: set flow-control rts/cts
: set modem flow rts/cts
: blah-blah-blah, but w/o set modem line
: Then I start kermit, say connect and dial ( by ATD command)
:
: Looks like kermit doesnt set one of rts/cts flow; too many bytes is
: written to modem, but modem buffer overflows and it causes this error.
:
Did you give a "set modem type" command? What modem type did you use?
: Modem is seted up with the greatest command AT&F, and it is enough (includes
: rts/cts and so on)
:
In that case, you can also use "set modem type generic-high-speed" which does
exactly this (initializes the modem with AT&F).
: Another question, advanced: so, I have sz writing to standart output.
: Can it set hardware flow control to standart output( via tcsetattr, or
: ioctl )? Is it sz's business to do it?
:
No. It is not Zmodem's business to do it. It is using the file descriptor
from Kermit. Anyway, if you follow the directions for making Kermit go fast,
you won't need to worry about the interface between Kermit and Zmodem.
- Frank