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The USB4 specification was released on 29 August 2019 by USB Implementers Forum, [101] based on the Thunderbolt 3 protocol specification. [102] It supports 40 Gbit/s (5 GB/s) throughput, is optionally compatible with Thunderbolt 3, and is backwards compatible with USB 3.2 and USB 2.0.
Thunderbolt 3 Gen 2 and Gen 3 and the USB4 Gen 2 and Gen 3 modes use very similar signaling. However, Thunderbolt 3 runs at slightly higher speeds, called legacy speeds, compared to rounded speeds of USB4. [34] It is driven slightly faster at 10.3125 Gbit/s (for Gen 2) and 20.625 Gbit/s (for Gen 3), as required by Thunderbolt specifications.
After the specification was made royalty-free and custodianship of the Thunderbolt protocol was transferred from Intel to the USB Implementers Forum, Thunderbolt 3 has been effectively implemented in the USB4 specification – with compatibility with Thunderbolt 3 optional but encouraged for USB4 products. [126]
It is used for all USB protocols and for Thunderbolt (3 and later), DisplayPort (1.2 and later), and others. Developed at roughly the same time as the USB 3.1 specification, but distinct from it, the USB-C Specification 1.0 was finalized in August 2014 [26] and defines a new small reversible-plug connector for USB devices. [27]
Under the USB 3.2 specification, released 22 September 2017, [11] existing SuperSpeed certified USB-C 3.1 Gen 1 cables will be able to operate at 10 Gbit/s (up from 5 Gbit/s), and SuperSpeed+ certified USB-C 3.1 Gen 2 cables will be able to operate at 20 Gbit/s (up from 10 Gbit/s). The increase in bandwidth is a result of multi-lane operation ...
USB 3.2 Specification USB 3.2, released in September 2017, replaces the USB 3.1 specification. It preserves existing USB 3.1 SuperSpeed and SuperSpeed+ data modes and introduces two new SuperSpeed+ transfer modes over the USB-C connector using two-lane operation, doubling the signalling rates to 10 and 20 Gbit/s (raw data rate 1 and ~2.4 GB/s).
The base UCFF motherboard and kit without Thunderbolt or USB 3 are codenamed Golden Lake (D33217GK) and Ice Canyon (DC3217IY) respectively. The Thunderbolt capable UCFF motherboard and kit are codenamed Campers Lake (D33217CK) and Box Canyon (DC3217BY) respectively.
The Thunderbolt serial bus platform can achieve speeds of up to 10 Gbit/s, [56] which is up to twice as fast as the USB 3.0 specification, 20 times faster than the USB 2.0 specification, and up to 12 times faster than FireWire 800. [57]
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