How to use the new HDMI cables

Yesterday, an addition to the HDMI 2.1a protocol added HDMI Cable Power, allowing users to utilise longer HDMI cables without a separate power adapter.

HDMI Cable Power will circumvent the constraint of HDMI 2.1's Fixed Rate Link signalling method

Active HDMI cables utilise an amplifier to strengthen the signal, enabling it to be maintained across greater distances without deterioration. 

HDMI Cable Power cables may take up to 300 mA from a source's 5V supply straight from the HDMI socket

HDMI Cable Power cables are one-directional, having a set source and output.

"One end of the cable is labelled for the HDMI Source (transmitting) equipment and the other for the HDMI Sink (receiving) device. 

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