Multimedia communications on a heterogeneous network

A heterogeneous intelligent network is described that was designed and implemented to allow multimedia realtime communications and messaging among local area network workstations with logically associated speakerphones and ISDN (integrated-services digital network) voice/data terminals with transparent tablets on top of bit-map screens and stylus pens. The architecture, presentation, editing, storage, and retrieval of multimedia documents in these two different kinds of terminals are examined. The messages and protocol conversion facilities used for multimedia communications are presented, as are the lessons learned in internetworking a local area network with an ISDN.<
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