Abstract

Introduction At the March, 1992 meeting of the Internet Engineering Task Force (IETF) in San Diego, live audio from several sessions of the meeting was "audiocast" using multicast packettransmission from the IETF site over the Internet to participants at 20 sites on three continents spanning 16 timezones.Thisexperimentwasnotonly the first sizeable audio multicast overapacketnetwork, but also significant for the size of the IP multicast network topology itself. The audiocast included all the general sessions plus a few working group breakout sessions. Unlike listening to a radio broadcast, the remote participants could also talk back,aswasdemonstratedduringa brief technicalpresentation on the experiment. Though the audio transmission was not perfect, it worked well enough in both directions that remote participants were able to ask cogent questions and engage in the discussions during the working group sessions. This event was a demonstration of technology developed and teste

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