HDMI License Manager has published some details about the next HDMI standard with 48 gigabits per second. In HDMI 2.1a, the Cable Power function is added, which allows the cables to be powered through the HDMI connector, which actively amplifies the signal. It is also possible to add an extra connector in the form of usb micro-b or type-c, as the old connectors cannot provide the necessary 300mA at 5 volts.
Because these power cables only work in one direction, the ends are marked. In addition to Cable Power, arc and ear must also be supported on cables defined by one of the following four definitions: Ultra High Speed, Premium High Speed with Ethernet, High Speed with Ethernet, and Standard HDMI with Ethernet
source: golem
Source: Hardware Info
