Path: utzoo!attcan!uunet!cs.utexas.edu!tut.cis.ohio-state.edu!ucbvax!AHWAHNEE.STANFORD.EDU!dcrocker
From: dcrocker@AHWAHNEE.STANFORD.EDU (Dave Crocker)
Newsgroups: comp.protocols.iso
Subject: Re: TCP/IP versus OSI
Message-ID: <8905130149.AA14613@ucbvax.Berkeley.EDU>
Date: 12 May 89 22:35:26 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 13

The transport service bridge essentially maps TCP to TP4.  It requires
that both networks/users/end-points be running the same application
protocol.  This reduces to requiring that the TCP user also be running
OSI applications.

If the two sides must remain "pure" to their base technology -- i.e.,
there may be no change to the environments on either side -- then you
are stuck with using application gateways.  These implement all of
both stacks, all the way up to and including both sets of applications,
with an "eighth" layer that translates from one application to the
other.

Dave