A CDP port is generally marked with a symbol to indicate to the user that it can supply more power.ĭedicated Charging Port (DCP) A downstream port that provides power over a USB connection to a portable device. The charging setup as described for the personal computer example of the previous section can also represent a Charging Downstream Port. When a USB device is connected to a CDP, the device will be enumerated successfully by the host. 100mA when it is connected and not configured. When a portable device is connected to a charging port, it is expected to behave in the following way: But unlike the SDP, a CDP port allows a USB device to draw more current, thereby facilitating faster charging. The charging setup as described for the personal computer example of the previous section represents a Standard Downstream Port.Ĭharging Downstream Port (CDP) refers to a port on a host or hub that’s compliant with USB 2.0 specifications. When a USB device is connected to a SDP, the device can draw 100mA and up to 500mA once the device is enumerated successfully by the host.
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