Super Speed Plus USB
Super Speed Plus Universal Serial Bus (USB) was first introduced in 2013 with the release of the USB 3.1 specification. This version features the introduction of a 10 Gbit/s transfer speed. To avoid confusion and begin a new naming convention, in 2015 USB 3.1 was named USB 3.1 Gen 2 and USB 3.0 was renamed USB 3.1 Gen 1.
Super Speed Plus USB significant features
- Speeds of up to 10 Gbit/sec are supported
- Backwardly compatible with all speeds defined in USB 2.0
- New, and slightly larger connectors are used for Super Speed Plus USB than are used with USB 2.0. The Hub receptacles receiving these connectors can also accept the standard 2.0 connectors.
- Implements 128b/132b encoding in a full-duplex communications mode.
Data Signals
Super Speed Plus USB uses 6 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+)
| Pin Number | Signal | Description |
|---|---|---|
| 1 | VBUS | power |
| 2, 3 | D- , D+ | 2.0 Differential Pair |
| 4 | GND | Ground |
| 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 Plus Power Distribution
USB 3.1 Gen 2 provides for low-power and high-power ports. Both of these ports are able to supply their specified current while maintaining 10 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)
Notes
- 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.
