USB to CEC adapters exist that allow a computer to control CEC-enabled devices. It was defined in HDMI Specification 1.0 and updated in HDMI 1.2, HDMI 1.2a and HDMI 1.3a (which added timer and audio commands to the bus). CEC wiring is mandatory, although implementation of CEC in a product is optional. It is a one-wire bidirectional serial bus that is based on the CENELEC standard AV.link protocol to perform remote control functions. CEC also allows for individual CEC-enabled devices to command and control each other without user intervention.
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