A year ago, the USB Implementers Forum (USB-IF) published the technical features of: USB4 Standards. Listed are 40 Gbit/s speed, 16K video stream management, Thunderbolt 3 compatibility (optional), and backwards compatibility with existing Type-C cables, which currently run on the USB Type-C 2.0 standard. A year later, USB-IF unveiled a new version of the standard that applies to USB-C cables: USB Type-C 2.1.
It is clear that these new cables are compatible with devices with the USB4 standard. They will also be able to deliver a maximum power of 240 watts, which can be very interesting for computers. the games or other devices that consume a lot of power.
New signage has also been designed to make it easier to read the technical features of Type-C 2.1 cables and USB4-compatible devices. As can be seen in the example of USB-IF, everything is quite clear: a mention of USB, an indication of the maximum speed of data exchange (40 Gbit / s in the example) and finally about the maximum power that can be exceeded (240 W in the example). The chargers, for their part, earn a certification logo that provides maximum sustainable power.
If these new logos provide clarity, we can still regret that cable manufacturers can offer everything and nothing. Thus, the cable can support 40 Gbit/s transmission, but limited to a maximum power of 60 W, or support a load at 240 W, but limited to 20 Gbit/s transmissions. So there are four possible combinations. Wouldn’t it be better to limit the standard to a single cable that supports maximum speed and power? This would have simplified the cable offering and prevented bad purchases from the public, who are not always aware of all these intricacies.