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000225_news@columbia.edu_Fri Oct 27 11:20:49 1995.msg
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(5.65c+CU/IDA-1.4.4/HLK for <kermit.misc@watsun.cc.columbia.edu>); Fri, 27 Oct 1995 22:17:21 -0400
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Organization: University of Illinois at Chicago, ADN Computer Center
Date: Fri, 27 Oct 1995 16:20:49 CDT
From: <U54294@UICVM.CC.UIC.EDU>
Message-Id: <95300.162049U54294@uicvm.uic.edu>
Newsgroups: comp.protocols.kermit.misc
Subject: Re: VM/CMS Kermit w/Renex Protocol Converter
References: <Pine.SUN.3.90.951024210341.16495E-100000@bronze.coil.com>
<46mqgh$qc@apakabar.cc.columbia.edu>
Lines: 35
Apparently-To: kermit.misc@watsun.cc.columbia.edu
I had somewhat similar problems with a Renex protocol converter and
communications between a Unix-based C-Kermit and MVS/TSO Kermit at
my last client. As for you, the difficulties emerged when moving to the
Renex from another brand (which name I forget). In any case, I discovered
the following things when asked to help out:
1) Renex doesn't recommend use of XON/XOFF flow-control at speeds
above 9600 baud, and told me that they were going to remove it as
a configuration option for higher-speed ports in the future.
I think that 9600 is a general cutoff for software flow-control
use in most environments, at least informally. So use RTS/CTS
flow-control if at all possible. It's also faster.
2) Remember that flow-control is without meaning on the IBM mainframe
side of the protocol converter. RS232 flow-control, that is.
Communications are SNA/SDLC from that point to MVS/TSO Kermit,
which communicates with tput, and has therefore no control over
flow.
3) As a corollary to (2), if your modems have an option to pass
flow-control thru the phone or WAN connection so as to achieve
application-to-application flow-control, DISABLE it, at least if
you are using a reasonably recent mode such as V.42. All that
matters is that the Renex control flow to its local modem, and that
the host on the other end of the line do the same to its local
modem. The modems will take care of the rest. The modems in my
situation were Motorola Codex's (if memory serves...), they had this
option, and disabling it was one of the keys to the solution.
4) Renex had some internal port monitoring software which we made a
little use of (as does Kermit, of course). I found Renex tech
support to be quite capable and helpful, once I got their
attention. Unlike some vendors, they took Kermit seriously and
were interested in catering to Kermit users.
Hope this helps....Nick G.
+------------------------------+----------------------------------------+
| Just another roller-bearing | Nick Geovanis U54294@uicvm.uic.edu |
| ...in the Data Warehouse | Unix software and sysadmin |
+------------------------------+----------------------------------------+