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The dynamic sharing of bandwidth of a USB4 connection is achieved by encapsulating multiple virtual connections ("tunnels") of other protocols, such as USB 3.x, DisplayPort and PCI Express. USB4 is based on the Thunderbolt 3 protocol. However, it is different enough that backwards compatibility to Thunderbolt 3 is optional for many device types ...
A single Thunderbolt 3 or later port provides data transfer, support for two 4K 60 Hz displays, and quick notebook charging up to 100W with a single cable. Any Thunderbolt or USB dock can connect to a Thunderbolt 3 computer. USB devices can be connected to a Thunderbolt 3 or later port. DisplayPort and Mini DisplayPort devices are supported.
Thunderbolt 3 controllers can incorporate a USB 3.1 Gen 2 controller to provide compatibility with USB devices. They are also capable of providing DisplayPort Alternate Mode as well as DisplayPort over USB4 Fabric, making the function of a Thunderbolt 3 port a superset of that of a USB 3.1 Gen 2 port.
It was just last week when we heard that the 20Gbps USB 3.2 connectivity may show up on new devices later this year, but today, Intel is already talking about an even speedier USB4. At a Taipei ...
The USB 3.x specifications require that all devices must operate down to 4.00 V at the device port. Unlike USB 2.0 and USB 3.2, USB4 does not define its own VBUS-based power model. Power for USB4 operation is established and managed as defined in the USB Type-C Specification and the USB PD Specification.
The written USB 3.0 specification was released by Intel and its partners in August 2008. The first USB 3.0 controller chips were sampled by NEC in May 2009, [4] and the first products using the USB 3.0 specification arrived in January 2010. [5] USB 3.0 connectors are generally backward compatible, but include new wiring and full-duplex operation.