Cisco Systems plans to introduce a new line of products, including a digital stereo system at the Consumer Electronics Show in January in Las Vegas that is meant to move music wirelessly around a house. Cisco is working on other gadgets that will let people watch Internet video on their televisions more easily. And its biggest bet is that people will want to use a version of its corporate videoconferencing system called Telepresence to chat with their friends over their high-definition televisions.

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