4 ms·

For speeds, you are correct, there aren't too many: USB 3 speeds: 5, 10, 20 Gb/s USB 4 speeds: 40, 80 Gb/s But for power, it's all over the place. Every sing

For speeds, you are correct, there aren't too many: USB 3 speeds: 5, 10, 20 Gb/s USB 4 speeds: 40, 80 Gb/s But for power, it's all over the place. Every single cable and connector seems to have its own idea of what they want to do. It could be anywhere from: * 5V@100mA=0.5W (low power, with no power delivery standard) * 48V@5A=240W With a good dozen options in-between those two. The only unambiguous way is to just label them. One for speed in Gb/s, one for power in watts. Easy.

ianburrell 4y ago
The power level is negotiated by the devices with Power Delivery. The cables only support 3A or 5A. The 3A cables can go up to 60W. The 5A cables are emarked so devices can recognize them and go to 100W. I hadn't realized there are new EPR cables that go up to 240W, I guess that is third kind.
shagie 4y ago
> The only unambiguous way is to just label them. One for speed in Gb/s, one for power in watts. Easy. They're trying - https://www.kensington.com/news/docking-connectivity-blog/usb-c-demystified/ https://www.kensington.com/news/docking-connectivity-blog/us... and https://mms.businesswire.com/media/20210930005098/en/911442/5/New+USB+Image_for_PR_FINAL_v2+%281%29.jpg?download=1&_gl=1*ojgku8*_ga*MTU1MjU3Nzk4Mi4xNjc3NzA2NjUx*_ga_ZQWF70T3FK*MTY3NzcwNjY1MS4xLjAuMTY3NzcwNjY1MS42MC4wLjA https://mms.businesswire.com/media/20210930005098/en/911442/.... It's nice that there are so many standards to chose from though. https://xkcd.com/927/ https://xkcd.com/927/