Let’s go through what makes an altmode tick. That said, not all of them do – the USB3 is the simplest one. Most altmodes require digital USB-C communication, using a certain kind of messages over the PD channel. The three altmodes you can encounter nowadays are USB3, DisplayPort and Thunderbolt, there’s a few that have faded into obscurity like HDMI and VirtualLink, and some are up and coming like USB4. The ability to get a high-speed interface out of USB-C is called an Alternate Mode, “altmode” for short. When you have a device with high-speed needs exposed through USB-C, however, it’s glorious just how much USB-C can give you, and how well it can work. Not all devices take advantage of this capability, and they’re not required to – USB-C is designed to be accessible for every portable device under the sun. The pinout gives you four high-speed differential pairs and a few more lower-speed pairs, which let you pump giant amounts of data through a connector smaller than a cent coin. One amazing thing about USB-C is its high-speed capabilities.
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