|Initial Connection Communication Function Role
|power supply party （Source）
|DownStreaming Face Port (DFP)
|Interface output power
|power consumption party （Sink）
|UpStreaming Face Port (UFP)
|Interface input power
|Dual-role devices （Dual Role Port,DRB）
|Dual-role devices (DFP or UFP)
| 1. The interface can be either a power supply party or a power consumption party. Dual role switching (DFP or UFP) occurs during the connection. Both parties identify and determine the roles when the two devices are connected.
2. When another connected device is the power supply, this interface is the power consumer;
3. When another connected device is a power consumer, this interface is the power supply;
4. When the connected device also has dual roles, this interface may be a power supply or a power consumer.
|Power Supply Party
|Power Consumption Party
|power supply party
|power consumption party
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