In the beginning, Ethernet was optional. When Bob Metcalfe and David Boggs cooked up their network protocol at Xerox PARC in the early 1970s, it was meant to connect the research haven’s now famous Alto machines — but only if researchers felt the need. “Each scientist would get a kind of Alto order form,” Metcalfe remembers, “ …
"If memory serves CSMA-CD was under severe strain with the 100Mb standards and was done away with for 1Gb."
I would have said under severe strain with 1GB (but it was in the standard for political reasons) and abolished officially with 10GB. There were tighter restrictions on the number of repeaters you could chain at 100MB/s but that was close to being a moot point.
[Citation needed] "They replaced it with a 'token passing algorithm'."
They replaced it by ceasing to support shared media LANs and requiring full duplex operation 'anyone can talk when they like'. Whether you call it Ethernet without CSMA/CD or Token Ring without the token is an 'angels dancing on the head of a pin' question. I think you'ld have to be looking through (if not rose coloured) then big blue coloured spectacles if you think token ring really had the last laugh.
Actually, my network virginity was broken on Apollo Token Ring (with uni-directional coax cabling, dammit). Worked quite nicely at the time because the response order of the nodes was deterministic. Too long ago for me to remember Apollo's corporate colour. I have only ever decommisioned the IBM thing.
Fair'nuff on tokenless ring. The real point is that very little of Metcalf's thinking is left in the network we use today. Common cable and CSMA-CD just didn't withstand the scale that data networking demanded. I susbscribe to the view that people are making a hero out of someones inflated opinion of himself. Credit him with creation of the name but what else?
I'd guess at three of Jas. Watts ideas being still used in turbines.
Since you ask, are we talking about Cherubim, Seraphim or Thrones on this here pin?
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