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000216_fdc@columbia.edu_Tue Aug 12 09:21:09 EDT 2003.msg
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Article: 14454 of comp.protocols.kermit.misc
Path: newsmaster.cc.columbia.edu!news.columbia.edu!news-not-for-mail
From: fdc@columbia.edu (Frank da Cruz)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: Telnet zmodem
Date: 12 Aug 2003 09:18:26 -0400
Organization: Columbia University
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In article <WpYZa.2154$u%2.1308@nwrdny02.gnilink.net>,
marty <nospam@dontbother.luser> wrote:
: Using: C-Kermit 8.0.209, 17 Mar 2003, for Linux(RH 8.0)
:
: I have an account that allows me to connect via telnet to a SunOS 5.7
: server. Login presents me with the user menu, one of the choices is to my
: 'Personal files' section. Upload/Download features are via xmodem or
: zmodem. In the past on the windows side, I've used Hilgreave's
: HyperTerminal to do uploading/downloading to my 'Personal files' section.
:
: But know I'm using RedHat... & C-Kermit 8.0.209, 17 Mar 2003, for Linux. As
: powerful as C-Kermit is I figure it should allow me to do the same as I did
: on the windows side but...
:
: From a C-Kermit prompt I telnet to and log onto the server. The procedure
: for downloading via a telnet connection is to choose the download option
: and name the file one wishes to download. Chose xmodem or zmodem
: (C-Kermit: set protocol zmodem) and the process begins...
:
"set protocol zmodem" invokes an external protocol, whatever Red Hat happens
to have installed as "rz" and "sz".
: ================================
: Receiving: pine-error_addressbooks.png
: Retry 0: Bad CRC
: ...
: Bytes received: 0/ 30846 BPS:0 ETA 00:00 Retry 0: Bad CRC
: ...
: Retry 0: Bad CRC
:
: rz: pine-error_addressbooks.png removed.
: ================================
:
: The process finishes with me being dumped back to the C-Kermit prompt.
: Status: FAILURE
:
So "rz" failed.
: Uploads are just as unsuccessful. I start with a login to a telnet session
: from the C-Kermit prompt. Initiate an upload using zmodem (again C-Kermit
: is 'set protocol zmodem', do a Ctrl\c back to C-Kermit prompt issue the
: following...
:
: The file name shows in the list of files in my 'Personal file' on the host,
: but of course the file is 0 KB.
:
: I've only been using linux for a year or so now and C-Kermit for a few days
: so any help or suggestions would be much appreciated.
:
Some knowledge of serial communication is required. The C-Kermit book has
chapters and chapters explaining all this. Very briefly:
. We know the interface speed is right because you can see the
remote text.
. Probably the parity is right ("none") because the host would never
pick Xmodem or Zmodem as protocols if non-none parity were being
used.
. Therefore the most likely cause of failure is inadequate flow
control.
You have to make sure an effective form of flow control is established
between every pair of devices along the communication path, e.g. local
computer to its modem, modem to modem, remote modem to remote serial
port. See:
http://www.columbia.edu/kermit/support.html#hints
if you need to follow up.
- Frank