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Path: utzoo!utgpu!water!watmath!clyde!rutgers!seismo!uunet!steinmetz!davidsen
From: davidsen@steinmetz.UUCP
Newsgroups: rec.ham-radio.packet,comp.dcom.modems
Subject: Re: Gilmore responds...
Message-ID: <7176@steinmetz.steinmetz.UUCP>
Date: Tue, 1-Sep-87 10:15:48 EDT
Article-I.D.: steinmet.7176
Posted: Tue Sep  1 10:15:48 1987
Date-Received: Thu, 3-Sep-87 01:40:53 EDT
References: <115@splut.UUCP>
Reply-To: davidsen@crdos1.UUCP (bill davidsen)
Organization: General Electric CRD, Schenectady, NY
Lines: 27
Keywords: public access to ham spectrum
Xref: utgpu rec.ham-radio.packet:455 comp.dcom.modems:816

I will just add a little fuel to the fire on this debate, the Zmodem
protocol, heavily advertized in Chuck Forsburg's (sp?) signature, work
*very well* over packet connections, having been designed for just that.
In addition the low volume of reverse channel makes it suitable for use
with half duplex connections. Typical performance is 95+% of theoretical
max, for example 231-233 cps on 2400 baud async half duplex connects
(actual measured on a number of 100k+ file transfers).

I'm told that SEAlink and megalink provide the same range of
performance, but I see little reason to use them other than
compatibility and on very small machines which benefit from the low
overhead of megalink.

I have no idea why the performance of ham packet radio is so poor, nor
why various people on this group have claimed that the use of more than
one (or at most two) repeaters resulted in unacceptable throughput.
Unless there is a legal reason why this protocol may not be used, I
would like to invite one of the interested parties to test it. Source to
several versions of the drivers for the protocol have been posted, I
will supply them on request.

Yes, I realize that there will still be a problem with very small
messages, don't waste bandwidth mentioning it.
-- 
	bill davidsen		(wedu@ge-crd.arpa)
  {chinet | philabs | seismo}!steinmetz!crdos1!davidsen
"Stupidity, like virtue, is its own reward" -me