USB4 Specification

The USB4 specification compliments and build upon the existing USB 3.2 and USB 2.0 specifications. The USB4 architecture defines a method to share a single high-speed link with multiple end device types dynamically that best serves the transfer of date by tyye and application.


As the USB Type-C connector has evolved into the role of the external display port of many host products, the USB4 specification provides the host the ability to optimally scale allocations for display date flow. Even as the USB4 specification introduces a new underlying protocol, compatibility with existing USB 3.2, USB 2.0 and Thunderbolt 3 hosts and devices is supported; the resulting connection scales to the best mutual capability of the devices being connected.

USB4 identifies two transfer rates, USB4 20Gbps at 20Gbps and USB4 40Gbps at 40Gbps. Vendors must clearly communicate the performance signaling that a products delivers in the product’s packaging, advertising content, and any other marketing materials.

Marketing name: USB4 20Gbps

Product capability: product signals at 20Gbps

Marketing name: USB4 40Gbps

Product capability: product signals at 40Gbps

USB4 Key Messages

Two-lan operation using existing USB Type-C cables

Doubles the bandwidth to extend USB Type-C performance

Up to 40Gbps operation over 40Gbps-certified cables

Enables multiple simultaneous date and ids play protocols

Multiple date and display protocols efficiently share the total available bus bandwidth

USB4 hosts can optimally scale allocations for display date flow

Backward compatibility with USB 3.2, USB 2.0 and Thunderbolt 3


Post time: Dec-29-2020