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It used two pins of the connector: an unused pin and the hot plug detect pin This channel is used for high-speed bi-directional data communication.

HDMI Ethernet and Audio Return Channel (HEAC) It was introduced in HDMI 1.4.

It is transmitted as a differential signal.

HDMI Ethernet Channel (HEC) The channel allows the devices connected to HDMI to access the internet without using separate Ethernet cables.

DDC communication is based on I2C (Inter-Integrated Circuit) bus specification.

Display Data Channel (DDC) This channel is meant for communication between the display monitor and the PC.

Consumer Electronics Control (CEC) This channel is meant for the command and control of the user for up to 15 devices.

These channels are meant for the transmission of video, audio and auxiliary data as separate packet types.

Transition Minimized Differential Signaling (TMDS) The HDMI cable carries three (six, in the case of Type B) TDMS data channels numbered 0, 1, and 2.

Most of these are actually different communication channels used in HDMI technology. TDMS, CEC, DDC, HEC, HEAC, SCL, SDA, and EDID are the abbreviations included in the pinout.

It is essential to know what they denote for a proper understanding of the signaling of the connectors. The pinout description of HDMI connectors has several abbreviations. Best USB-C to HDMI Adapters in 2023 (Our Top 7 Picks).The pinout description of HDMI type B is given in the table below.

But this connector was not used in any devices since the newer HDMI version(1.3) does not support this dual link property. To support this extra feature, it has 29 pins while all other connector types have 19 pins. But the order of signaling is slightly different, which is given in the table below. This is the smallest HDMI connector.Īlthough it is the smallest, it also maintains 19 pins and retains all the basic functionalities. The size of this connector is 5.83 mm x 2.2 mm. Type D is also called Micro HDMI Connector.