| 摘要 |
A port that supplies power in accordance with a standard is equipped with a variable power supply and a power line communications module. Power line signals on the power conductors are used to allow a port controller to negotiate power requirements with peripheral devices and the power supply is adjusted accordingly. If the peripheral device does not support such negotiation, power is delivered in accordance with the standard. The port may be a data communications port that supplies power and data in accordance with a standard.
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