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Introduction to USB4
 Mar 02, 2024|View:463

1、What is USB4

USB4 is the latest generation of USB transmission standards, backward compatible with USB 2.0, USB 3.2 and Thunderbolt 3, in fact, it is based on ThunderBolt 3, added to complement and develop the USB 2.0 and USB 3.2 standards.USB4 has two types of transmission bandwidths, one is 20Gbps, and the other is 40Gbps.

Key Features: Supports up to 40Gbps bandwidthPhysical interface is USB Type-C onlySupports dynamic bandwidth allocationOptionalWhether or not Thunderbolt 3 is supported, only then the maximum bandwidth of 40Gbps can be reachedThe mandatory use of USB-PD charging protocol is requiredThe USB4 has only one physical interface, USB Type-C. The USB4 is divided into different "tunnels" on the transmission link to transfer data, and is able to "dynamically allocate bandwidth", dynamically adjusting the bandwidth of each section based on the real-time situation of each "tunnel". Currently, three types of tunnels are supported: data transfer (USB 3.2 tunnel), video transfer (DisplayPort 1.4a tunnel), and optional tunnel (PCI-E tunnel).


2, what is Thunderbolt

Thunderbolt, also known as Thunderbolt or Thunderbolt, is a set of connectivity standards released by Intel

, which switched to the USB Type-C connector starting with Thunderbolt 3. There is a lightning bolt logo on

the side of the USB-C connector, which is more common on Apple computers.The latest standard, Thunderbolt 4, has minor updates from Thunderbolt 3. It also supports the connection

of two 4K monitors, or one 5K monitor. Note that USB4 is optionally compatible with both Thunderbolt 3 &

4. Think of it this way: USB4 40Gbps equals Thunderbolt 4.