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Why isn’t there a wire on pin 20 (POWER) on the standard external DisplayPort cables?

April 26, 2017cables displayport external isn’t Pin power standard wire

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Why isn’t there a wire on pin 20 (POWER) on the standard external DisplayPort cables?

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The reason power isn’t included in standard cables is because both source and sink devices are designed to provide power. Captive, attached cables often include the power wire. If it is desired, for example, that a particular source device utilize the power available from the mating sink device, then that Source device could include an attached or dedicated cable that carries the DisplayPort power signal. Same could be applied to a sink device.