Shulou(Shulou.com)11/24 Report--

Thanks to CTOnews.com netizens Wu Yanzu and OC_Formula for the clue delivery! CTOnews.com Sept. 4, on September 2, USB Promoter Group announced the USB4 Version 2.0 standard, which enables data transmission of up to 80 Gbps (10GB/s) over USB Type-C cables.

According to Angstronomics, USB4 Version 2.0 may support PAM3 (Pulse amplitude Modulation) data coding and bring asymmetric transmission up to 120Gbps.

CTOnews.com learned that the USB Type-C interface was standardized in 2014, with two pairs of high-speed data links, each with sending and receiving capabilities. Therefore, in a normal USB data configuration, the 4 channels are configured with 2 Tx + 2 Rx symmetrical settings. USB4 Version 2.0 achieves 40 Gbps per channel, so it has a bidirectional bandwidth of 80 Gbps.

In April this year, the German Science and Technology website listed relevant information about USB4 Version 2.0 (PAM3) and said it was "used for USB with next-generation PAM3 modulation".

If the revelations are true, USB4 Version 2.0 will support asymmetric 3 Tx + 1 Rx configurations, which means that the output of 120 Gbps from the host and the return of 40Gbps from the device to the host can be useful in many scenarios where asymmetric data transfer is required, such as display + docking station, 80Gbps as monitor output, and 40Gbps as data transfer.

Angstronomics also said that Intel has taken the lead in adapting, and Meteor Lake processors are expected to support USB4 Version 2.0.

According to the USB Promoter Group announcement, the specifications for USB Type-C and USB PD will also be updated to achieve higher levels of data performance. All of these specification updates are expected to be released before the USB DevDays series developer event scheduled for November this year.

In addition, USB Promoter Group will update the protocol to achieve higher performance USB 3.2, DisplayPort (DP) and PCI Express (PCIe) performance.

The main highlights of the USB4 Version 2.0 standard are as follows:

Up to 80 Gbps of operation, based on the new physical layer architecture, using existing 40 Gbps USB Type-C passive cables and newly defined 80 Gbps USB Type-C active cables.

Update data and display protocols to better take advantage of the increase in available bandwidth.

The USB data schema update now enables the USB 3.2 data tunnel to exceed 20 Gbps.

Update DisplayPort and PCIe standards to comply with the latest specifications.

Backward compatibility with USB4 Version 1.0, USB 3.2, USB 2.0, and Thunderbolt 3 standards.

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