HDMI 1.4 has six data channels operating at four different speeds:
HDMI Ethernet and Audio Return Channel (HEAC): A high-speed bi-directional data communication that supports 100Base-TX (100Mbps) Ethernet. HEAC includes a streaming audio component that conforms to the IEC 60958-1.
TMDS (Transition Minimized Differential Signaling): Three differential channels for high-speed video and data transmission. HDMI 1.4 has a maximum throughput of 10.2Gbps or 3.4Gb per channel.
DDC (Display Data Channel): Communication channel based on the industry-standard I2C protocol at a standard rate of 100kbps; it enables the source device to identify the supported audio/video formats.
CEC (Consumer Electronics Control): A low-speed channel that allows the user to control up to 15 compatible devices. This channel conforms to the CENELEC EN 50157-1.
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