Consumer Electronics Control (CEC) is a serial protocol embedded into HDMI signals to allow devices to communicate over the HDMI cable. Although CEC specifies some standards for commands, it allows for variations in implementation by manufacturers, so devices from one manufacturer may or may not communicate properly with devices from another. Most major consumer electronics manufacturers have branded their own interpretations of CEC, adding to the confusion.
Many Gefen HDMI devices pass CEC signals, but do not interpret them. Devices such as splitters and matrix switchers usually do not pass CEC signals, as that would cause erratic responses, since CEC is defined as a one-to-one protocol.

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