Super Speed Universal Serial Bus (USB) was first introduced in 2008 with the release of the USB 3.0 specification. In 2015 USB 3.0 was renamed USB 3.1 Gen 1 to avoid confusion.
Super Speed USB significant features
- Speeds of up to 5 Gbit/s are supported
- Backwardly compatible with all speeds defined in USB 2.0
- New, slightly larger connectors are used for Super Speed USB than are used with USB 2.0. The Hub receptacles receiving these connectors can also accept the standard 2.0 connectors.
- Implements 8b/10b encoding in a full-duplex communications mode.
SuperSpeed USB uses six data lines configured in two groups:
- D+ and D- differential half-duplex signals
- Two pairs of full-duplex differential signals ( SSTX-, SSTX+, and SSRX-, SSRX+)
|2, 3||D- , D+||2.0 Differential Pair|
|5, 6||SSRX- , SSRX+||Super Speed receiver differential pair|
|7||GND_DRAIN||ground for return signal|
|8,9||SSTX- , SSTX+||Super Speed transmit differential pair|
Super Speed Power Distribution
USB 3.0 provides for low-power and high-power ports. Both of these ports are able to supply their specified current while maintaining 5 Gbit/s transfers.
- Low-power ports provide up to 150 ma
- High-power ports provide up to 900 ma
There are several power delivery specifications cable of supplying additional power. Not all modes can sustain the data transfer while supplying power ( see the power delivery specifications for details)
- Many observers believe Super Speed USB will be quickly eclipsed by 10GB Super Speed + USB
- The full Super Speed USB specifications are available from USB Developers Forum.