Webinar: Ethernet's Emergence from Xerox PARC: 1975-1980

Paul Koning paulkoning at comcast.net
Mon Mar 28 14:08:44 CDT 2022

> On Mar 28, 2022, at 2:12 PM, Joseph S. Barrera III via cctalk <cctalk at classiccmp.org> wrote:
> That was the ALOHA network, which inspired Ethernet but was not Ethernet.

The differences are quite crucial.  ALOHA is a broadcast radio packet network, which doesn't have collision detect and probably not carrier sense either.  So it's about 1/3rd of Ethernet -- just MA. :-)  A consequence is that the theoretical channel capacity is also about 1/3rd; ALOHA tops out around 30% of data rate, while Ethernet -- thanks to CS and CD -- can reach pretty much the full wire capacity.


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