USBCDC

USBCDC refers to the USB-C DisplayPort Alternate Mode (Alt Mode) capability that allows a USB-C port to transmit DisplayPort signals. This feature enables devices like laptops, tablets, and smartphones to output video and audio signals directly through their USB-C port to an external display, such as a monitor or TV, using a USB-C to DisplayPort cable or adapter.

When a USB-C port supports DisplayPort Alt Mode, it essentially repurposes some of the high-speed data lanes within the USB-C connector to carry DisplayPort traffic. This eliminates the need for separate video output ports like HDMI or dedicated DisplayPort connectors on devices that also offer USB-C connectivity. The specific version of DisplayPort supported can vary between devices, impacting the maximum resolution and refresh rate achievable.

The primary benefit of USBCDC is its versatility and the potential to reduce the number of ports on portable devices. It allows for a single USB-C port to handle data transfer, power delivery, and video output simultaneously, simplifying connectivity and reducing cable clutter. This feature is particularly useful for thin and light laptops and mobile devices where port selection is often limited. Compatibility between the host device, the cable or adapter, and the display is crucial for USBCDC to function correctly.