[ih] principles of the internet

[John Day]

Well, yea, that too!  ;-)  The point is that difference between Aloha 
and Ethernet is mostly physics not effort!  ;-)  (more or less)

Ensuring that all receivers could hear all transmitters (which also 
requires bounding the length) is what makes the main difference.  by 
greatly reducing the probability of a collision.

At 13:22 -0400 2010/06/03, Noel Chiappa wrote:
>     > From: John Day <jeanjour at comcast.net>
>
>     > Alohanet and Ethernet make the same "effort." The difference is the
>     > theoretical limit of the media. Ethernet is higher because the aether
>     > has been replaced by coax. Not because Ethernet made more effort than
>     > Alohanet.
>
>Not sure if this is what you're referring to with your reference to "aether
>... replaced by coax", but... Ethernet's channel access algorithm (CSMA-CD) is
>slightly different from Aloha's (which was, IIRC, CSMA). (To get the -CD to
>work semi-reliably they had to limit the network's physical size, and increase
>the minimum packet size, in ways that weren't feasible with the aether.) I
>seem to recall that adding the -CD upped the theoretical throughput (as a
>%-age of channel bit rate) considerably.
>
>	Noel