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

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From: Guy Harris <gharris@xxxxxxxxxxxx>
Date: Mon, 2 Aug 1999 22:21:33 -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?

The page at

	http://www1.math.luc.edu/~anca/488-8.html

says in its discussion of 802.2 LLC:

	SABME supports 128 sequence numbers.

which suggests that's how basic vs. extended is selected; however, as
noted in this discussion, if you don't have the SABME frame in your
capture, the analyzer program has no way of knowing whether it's basic
or extended operation.