Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!bbn!rochester!udel!pcpond!farber
From: farber@pcpond.UUCP (David J. Farber)
Newsgroups: comp.protocols.tcp-ip
Subject: Re: Soderblom and token ring
Message-ID: <38@pcpond.UUCP>
Date: 15 May 89 01:26:36 GMT
References: <8124@thorin.cs.unc.edu>
Reply-To: farber@.UUCP (David J. Farber)
Organization: PCPond
Lines: 14



Yes, Sonderblom claims that his patents cover  most  varients  of
the  "  token  loop"  technology.  His basic application was as a
terminal control loop. It was only in a much latter USA patent  (
if  my memory serves me late 1970s) that he added claims to cover
a loop with completely decentralized control. The initial patents
did not cover that. To my knowledge the DCS (Distributed Computer
System) underlieing token ring was the first operational ring  to
have  fully  decentralized  control (and the operating system was
one of the first fully distributed fault tolerent  message  based
systems) dated in the 1970 - 1974 time frame.

Dave