USB4 2.0 specification released to achieve 80Gbps transmission bandwidth

USB-IF announced the release of the USB4 version 2.0 specification, which can achieve 80Gbps transmission performance, and the related USB Type-C and USB Power Delivery (USB PD) specifications have also been updated.

Key features of the updated USB 80 Gbps solution include:

  • Utilizing a new physical layer architecture based on PAM3 signal encoding speeds up to 80 Gbps can be achieved on 40 Gbps USB Type-C passive cables and the newly defined 80 Gbps USB Type-C active cables.
  • The USB Type-C signaling interface can be configured asymmetrically to provide up to 120 Gbps in one direction while maintaining 40 Gbps in the other.
  • Update data and display protocols to better take advantage of increases in available bandwidth.
  • Compliant with DisplayPort 2.1 and PCI Express 4.
  • Backward compatible with all previous versions of USB.

The DP 2.1 specification was released a few days ago. DisplayPort 2.1 enhances compliance with the USB Type-C specification and the USB4 PHY specification to facilitate a common PHY serving DisplayPort and USB4. Additionally, DisplayPort 2.1 adds a new DisplayPort bandwidth management feature that enables DisplayPort channels to coexist more efficiently with other I/O data traffic over the USB4 link.

At present, many high-end 4K monitors choose to support USB-C one-line connection to the notebook. After the USB4 2.0 solution with 80Gbps bandwidth becomes available, some 4K 144Hz monitors are also expected to be able to connect to notebooks via USB-C.

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