Ethereal-dev: Re: [ethereal-dev] LAPB/X.25 patch

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From: Guy Harris <gharris@xxxxxxxxxxxx>
Date: Mon, 2 Aug 1999 22:28:45 -0700
> Perhaps it's set by one of the Set Mumble Mumble Mode Extended commands?
> I.e., perhaps the connection starts off in basic mode, and one side
> sends something like Set Asynchronous Balanced Mode Extended to tell the
> other side that they should both run modulo 128?

...and

	http://www.blackbox.nl/techweb/protocol/x25.htm

says:

	The CONTROL field is initialized with a Set Asynchronous
	Balanced Mode (SABM).  There is also an extended operation
	(SABME) that provides a modulo-128 frame window.  LAPB is a
	full-duplex mode of operation.