Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!rutgers!cs.utexas.edu!uunet!mcvax!piet
From: piet@cwi.nl (Piet Beertema)
Newsgroups: comp.dcom.modems
Subject: Re: Zmodem over X.25
Message-ID: <910@sering.cwi.nl>
Date: 30 May 89 12:57:36 GMT
References: <35@csnz.co.nz>
Organization: CWI, Amsterdam
Lines: 28


	>I tried setting SET 3:126 which should make all ASCII
	>control characters and DEL become forwarding characters, but 
	>this does not fix the problem - it seems that I am only setting
	>the parameters in my local PAD.  How can I set the parameters
	>in the PAD in Spain remotely?
No way to do that with the vast majority of PAD's that are on
the market. Only a few PAD's (e.g. Micom) allow you to "escape
to X.29 control mode" making it possible to read/set the remote
PAD's X.3 parameters.

	>Now file transfer - I have got Kermit working, since it uses CR to
	>terminate its packets.  It's SLOOOOOOW, especially because it has
	>no windowing and slow turn-around.
Between Spain and New-Zealand X.25 links will go via satellite,
possibly even via 2 satellites. That's causing massive delays.
Furthermore it's not unusual that there is some fancy gateway
involved that by default limits your link speed to 1200 bps...
And even without satellites involved, X.25 is slow, as was proved
long ago here in Europe with uucp: the standard (packet) g-proto
was about 3 times slower than the (non-packet) f-proto; with the
latter we obtain effective speeds around 2500 bps (on a 4800 bps
line) between Holland and Japan and around 2000 bps to Australia.

-- 
Opinions expressed above reflect those of my employer, except when they don't.

	Piet Beertema, CWI, Amsterdam	(piet@cwi.nl)