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Isochronous (iso = same, chronous = time) network technologies are designed to deliver real-time voice and video over data networks. Isochronous is the opposite of asynchronous, in which data transmissions are broken up and not sent in a constant stream. Isochronous is similar to synchronous, but does not have the perfectly timed stream of bits or bytes that a synchronous stream adheres to. ATM is an isochronous technology. It provides predictable behavior by delivering data in fixed-sized cells across predefined virtual circuits. iso-Ethernet is another network technology that provides isochronous services.
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