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000025_news@newsmaster….columbia.edu _Sun Jul 6 11:53:57 1997.msg
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From: fdc@watsun.cc.columbia.edu (Frank da Cruz)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: File transfer echo problem
Date: 6 Jul 1997 15:53:55 GMT
Organization: Columbia University
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In article <5poa33$t65$1@alcor.nstar.net>,
Andrew Chalk <achalk@intex.net> wrote:
: I am using a micro to communicate from a kermit implementation that I
: wrote to Kermit-TSO v4.0 (88/3/14). When I use the RECEIVE <filename>
: command and send my SEND-INIT packet, the mainframe ECHOS BACK the
: SEND-INIT packet, and then sends the expected ACK. In fact, when I
: modified my code to handle this i found that the mainframe echoes back
: EVERY PACKET I send, including the 'D' (DATA) packets before returning
: the expected response?
:
: Is this a bug in Kermit-TSO or a setting on the mainframe. It
: certainly is strange!
:
And through what kind of device are you accessing the mainframe?
Evidently it is some sort of 3270 protocol converter that has not been
put into transparent mode. You should install the current version of
IBM mainframe Kermit (4.3.1), since it has a better chance of detecting
the kind of protocol converter and putting it into transparent mode
automatically. If that doesn't work, read the IBM Mainframe Kermit
manual on this topic:
ftp://kermit.columbia.edu/kermit/b/iktker.{ps,doc}
In the worst case, you've got a 3270 protocol converter that does not
support transparent mode, and so your Kermit version must cope with the
echoes and other phenomena (line wrapping, etc).
- Frank