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From: martillo@athena.mit.edu (Yakim Martillo)
Newsgroups: comp.dcom.lans
Subject: Re: OSI-model software
Message-ID: <943@bloom-beacon.MIT.EDU>
Date: Wed, 17-Jun-87 18:03:33 EDT
Article-I.D.: bloom-be.943
Posted: Wed Jun 17 18:03:33 1987
Date-Received: Sun, 21-Jun-87 10:30:15 EDT
References: <1204@botter.cs.vu.nl> <1680@munnari.oz>
Sender: daemon@bloom-beacon.MIT.EDU
Reply-To: martillo@athena.mit.edu (Yakim Martillo)
Organization: MIT Project Athena
Lines: 8
Keywords: osi, iso, internetworking

I think X.25 level 2 and LAPB are fairly frequently used
interchangeably.  This is slightly erroneous because X.25 level 3 can
run over other link access protocols.  Also I meant the X.25 designers
basically assumed that you would never have a transmit window in a
protocol above level 3.  LAPB has a window basically for
error-handling and X.25 level 3 has a flow control window.  Anyone who
has tried to run kermit over a PSPDN knows how well all the
transmission windows interact.