USB4 Specification Announced: 40 Gbps, Type-C, TB3 Support

The USB Promoter Group has announced the upcoming release of the USB4 specification. The new standard is based on Intel’s Thunderbolt protocol and supports a range of features, including data transfer rates of up to 40 Gbps, display interfaces, and power delivery. The detailed USB4 specification will be published in the middle of 2019.

The USB4 specification will be based on the Thunderbolt protocol that Intel has contributed to the USB Promoter Group. The new interface will use USB Type-C connectors and will maintain backwards compatibility with USB 2.0, USB 3.2, and Thunderbolt 3 interfaces.  The maximum data transfer rate supported by the new USB4 interface is 40 Gbps over 40 Gbps-certified cables. Also, USB4 will support various display protocols, and power delivery.

The USB4 standard will be officially ratified in the middle of 2019. At present over 50 companies are actively participating in the final stages of development of the draft USB4 specification.

USB4 Specification Announced: 40 Gbps, Type-C, TB3 Support 1 USB4 Specification Announced: 40 Gbps, Type-C, TB3 Support 2

Based on what we know about the USB4 specification at this point, the new standard will use the Thunderbolt protocol, but it will not be exactly Thunderbolt 3 as its functionality will likely be different.

USB Specifications
  USB 1.0 USB 2.0 USB 3.0 USB 3.1
Gen 2
USB 3.2
Gen 2×2
USB4
Alternative Branding High Speed Super
Speed
Super
Speed+
Super
Speed+
Super
Speed+
Bandwidth 12 Mbps 480 Mbps 5 Gbps 10 Gbps 20 Gbps 40 Gbps
Encoding 8b/10b 128b/132b
Introduction 1996 2001 2011 2014 2017 2019

The contribution of the Thunderbolt 3 protocol to the USB Promoter Group essentially brings TB3 to mainstream PC platforms and enables various companies to integrate its support into their products. Meanwhile, Intel’s Ice Lake processors will be the first CPUs to support Thunderbolt 3 natively.

“Releasing the Thunderbolt protocol specification is a significant milestone for making today’s simplest and most versatile port available to everyone,” said Jason Ziller, General Manager, Client Connectivity Division at Intel. “By collaborating with the USB Promoter Group, we’re opening the doors for innovation across a wide range of devices and increasing compatibility to deliver better experiences to consumers.”

Related Reading

Sources: USB Promoter Group, Intel

USB4 Specification Announced: 40 Gbps, Type-C, TB3 Support 3
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