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Path: utzoo!mnetor!seismo!rutgers!ames!ptsfa!ihnp4!drutx!druhi!clive
From: clive@druhi.UUCP (Clive Steward)
Newsgroups: comp.dcom.modems,comp.sys.ibm.pc
Subject: Re: How do I transfer files through a telenet connection?
Message-ID: <1864@druhi.UUCP>
Date: Tue, 21-Apr-87 01:08:56 EST
Article-I.D.: druhi.1864
Posted: Tue Apr 21 01:08:56 1987
Date-Received: Thu, 23-Apr-87 03:32:33 EST
References: <634@thumper.UUCP>
Organization: resident visitor
Lines: 34
Xref: mnetor comp.dcom.modems:471 comp.sys.ibm.pc:3471

in article <634@thumper.UUCP>, tr@thumper.UUCP says:
> 
> []
> 
> I often call my host by dialing Telenet and connecting
> through it.  Apparently, there is a "transparent"
> protocol going on while I am typing and receiving text
> data.  But when I try to use Xmodem, Kermit, or Vtrans
> (a proprietary protocol that comes with Vterm, a
> commercial terminal emulator for the IBM PC), the transfer
> fails in the first packet.

Well, you are out of luck, as you suspect.

Packet networks introduce delays which are in excess of the timeouts
on simple protocols.  Increasing the timeouts would work, but at
tremendous (5:1 or greater) cut in throughput.

The only protocols which will work are of the windowing variety --
like the X.25 used internally by the nets themselves.  (Windowing
means keeping track of a list of packets which have been sent but not
acknowledged yet, and marking them off/resending as necessary.  There
are many flavors with various sophistication about this).

You might like to try Chuck Forsberg's YAM protocols -- he recently
posted a set of sources for them in C.  Either Ymodem or Zmodem (don't
have doc handy...) is an upgrade to Xmodem which has windowing.
You'll need to compile and run them on both your host and home
machine; must have matching set.


Clive Steward
Resident Visitor (That's what AT&T calls contract workers and consultants,
whatever field you happen to be working in.)