Abstract: A system and method for multicast transmission are disclosed. In one embodiment, a virtual exchange network including interconnected nodes is embedded within a network. A sender is disposed in communication with a root node and receivers are disposed in communication with a set of edge nodes. The sender publishes a packetized data stream to which the receivers subscribe. The packetized data stream is promulgated by implicit signaling through optimum virtual exchange network connections from the sender through the virtual exchange network to the receivers. The interconnected nodes, responsive to receiving the published packetized data stream, are adapted to multicast N instances of the published packetized data stream to N recipients selected from the group consisting of receivers and other of the interconnected nodes.

Abstract: A method and system providing wireless personal telepresence facilitating collaboration by two or more persons, each in different locations, on a task at one of the locations and requiring visualization by multiple persons. A portable wireless unit captures/transmits video depicting the technician's first-hand field of view while keeping her hands free to perform the task. The expert employs a management console for visualization of the task being performed by the technician while communicating in real time with the technician. The management console also provides control over video and audio functions including record, playback, freeze frame and image attributes. Communication between the two persons is accomplished by exchanging digitally compressed video and audio via a voice or data network, either public or private. A community server augments the system by supporting three or more participants and enabling communication across public networks.