Cable Power specification for HDMI cables. Free Technical Library News

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Cable Power Specification for HDMI Cables

15.06.2022

The HDMI Forum has published an amendment to the HDMI 2.1a standard describing Cable Power technology. With its help, accessory manufacturers will be able to get rid of external power supplies and other "crutches" when transmitting data over long distances without losing signal quality.

Modern HDMI cables have an implicit length limit of 3 meters to view content requiring full 48Gbps bandwidth without compromising signal stability or picture quality. When using longer accessories, as a rule, additional power adapters with a USB connector are used.

The new Cable Power specification allows additional power (up to 5V/0,3A) to be delivered directly through the accessory itself. Separate devices or connectors are not required - the power supply will be provided by the signal source itself (for example, a game console or media player).

It is noted that the function will only work in one direction. The user will have to check the location of the corresponding icon on the connector of the cable itself. If connected incorrectly, the accessory will not lose its functionality, but it will not receive additional power either - this can lead to a deterioration in signal quality.

It is not yet known which commercial devices will be the first to receive support for the Cable Power standard. Its developers also report that owners of old equipment will be able to use new cables using special adapters for micro-USB Type-B or USB Type-C.

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