CEC is a feature of HDMI 1.4 and HDMI 2.0 which allows different electronic devices to communicate and control other electronic devices through the HDMI cable.
For instance CEC can turn off other devices, when the TV is turned off. It can also be programmed so that when you turn on a device it changes the TV’s input source to the same source as the device that was just turned on.
Consumer Electronics Control (CEC) is a feature of HDMI designed to control HDMI connected devices by using only one remote controller; so, individual CEC enabled devices can command and control each other without user intervention, for up to 15 devices.For example, a television set remote controller can also control a set-top box and a DVD player.
It is a one-wire bidirectional serial bus that is based on the CENELEC standard AV.link protocol to perform remote control functions.CEC wiring is mandatory, although implementation of CEC in a product is optional.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)
Features:
HDMI-CEC provides several capabilities, which are listed below. However, not all listed are accessible on all HDMI-CEC enabled products. Also, feature compatibility between product brands may vary.
-Remote Control
-One-Touch Play
-Routing Control
-Deck Control
-One-Touch Record
-Timer Programming
-System Audio Control
-Device Menu Control
-System Standby
Advantages:
You can use your TV remote to control some features of devices that are connected to the TV using HDMI, which may lessen the need for a universal remote control.
The same HDMI cables that connect your audio and video components together can be used as a conduit for controlling those devices.
Disadvantages:
CEC functionality is not required to be included on all HDMI-equipped devices.
On devices that include HDMI-CEC, feature access is not always consistent when using mixed brand components.
Not as comprehensive control as using the device's own remote or a universal remote.
In some cases, HDMI-CEC must be activated in order for HDMI-ARC to also work.
Sometimes HDMI-CEC will activate or turn-off devices when you don't want it to.
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