[ih] Dave Farber's DCS
dhc at dcrocker.net
Wed Jul 22 18:44:41 PDT 2020
On 7/22/2020 4:48 PM, Karl Auerbach via Internet-history wrote:
> (IBM had to concede to DCS that IBM did not invent the token ring
> network concept.)
IBM's token product came during my time at Univ. of Delaware, almost 10
years after the DCS work, and Farber had an IBM contract. They sent a
senior tech out to present their token ring design to him and his
students, all of whom were EEs (other than me). This was clearly an
intent to get the august professor to bless their work.
In spite of not being all that well versed in the fine-grained technical
aspects of local area networking design choices, I could tell that their
design had a basic problem: The Irvine ring had a cost of one bit-time
per node the packet went through. The IBM insertion ring design imposed
an entire packet-time per node. So much for scaling.
After the presentation, it was interesting watching the discomfort among
Dave and the other students, non-verbally negotiating who was going to
deliver the assessment to the IBM person.
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