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1.1.4. DisplayPort Power
For Box-to-Box DisplayPort connection, the DisplayPort source and sink devices provide a power pin and a return current pin on the connector.
This power is provided by the DisplayPort source and sink to power up attached devices such as a Branch device or an Active Cable Assembly.
As per the VESA DisplayPort Standard, the maximum current drawn by an attached device is 0.5 A at 3.3V setting.