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Multimedia conferencing in the Etherphone environment

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4 Author(s)
Vin, H.M. ; Xerox Palo Alto Res. Center, CA, USA ; Zellweger, P.T. ; Swinehart, D.C. ; Rangan, P.V.

The latest extension of the Etherphone project is described. It creates a powerful conferencing system that lets users control their participation in multiple conferences across multimedia networks. The emphasis is on the software mechanisms that support its new features: first, a Sparcstation facility called Phoenix that extends the Etherphone software architecture to permit more flexible conferencing and to control Sparcstation-based Ethernet audio transmission, and, second, the integration of the Phoenix capabilities with Macaw, the earlier video extensions. Also described is a multicast packet protocol for audio transmission, which reimplements and extends the earlier special-purpose protocols, adding per-channel volume control and full support for the extended conferencing modes.<>

Published in:

Computer  (Volume:24 ,  Issue: 10 )

Date of Publication:

Oct. 1991

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