Your monitor's USB ports have many uses, but they don't all have the same capabilities.
On monitors with this built-in USB hub, you can connect a keyboard, mouse, webcam, flash drive or other accessory to the monitor and have it communicate with your PC through the USB connection.
On some models, the video connection and the USB hub are separate, so you might use HDMI or DisplayPort for the picture and another USB cable to make the monitor's USB ports work with your computer.
You can plug a keyboard or mouse into the monitor, then connect the monitor to your laptop with USB-C, and that one USB-C cable will both send the laptop's picture to the screen and carry the accessory data to the laptop.
Dell's U3223QZ is one example: its High Resolution setting reduces USB data to USB 2.0 speeds, while High Data Speed enables USB 3.0 bandwidth.
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The downstream ports are where you plug in accessories such as a mouse, keyboard or flash drive. For example, a model might have two downstream USB-A ports and a separate USB-B upstream port.
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Your monitor's USB ports have many uses, but they don't all have the same capabilities.
If your monitor has a couple of USB ports tucked along its back or side, they're likely there for your computer than the display itself. On monitors with this built-in USB hub, you can connect a keyboard, mouse, webcam, flash drive or other accessory to the monitor and have it communicate with your PC through the USB connection.
The exact way the ports work depends on the monitor. On some models, the video connection and the USB hub are separate, so you might use HDMI or DisplayPort for the picture and another USB cable to make the monitor's USB ports work with your computer. On supported USB-C monitors, one cable can handle both jobs.
You can plug a keyboard or mouse into the monitor, then connect the monitor to your laptop with USB-C, and that one USB-C cable will both send the laptop's picture to the screen and carry the accessory data to the laptop. Some monitors can also charge the laptop through the same USB-C connection.
The upstream port connects the hub to the PC.
DisplayPort Alt Mode allows a compatible USB-C connection to carry video alongside data, while USB Power Delivery can add laptop charging. Support for standards such as USB 3.2, USB4 and USB Power Delivery varies by device.
Dell's U3223QZ is one example: its High Resolution setting reduces USB data to USB 2.0 speeds, while High Data Speed enables USB 3.0 bandwidth.
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