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USB 3.0 – connections
Under the name "Super Speed" the new USB Version 3.0 has now become established
as the successor to the previously widespread USB 2.0 standard. The essential
advantages of the new USB standard include a high data transfer rate and an optimised
power supply.
In contrast to the USB 2.0 standard ("High Speed") with transfer rates of 480 Mbit/sec,
as "Super Speed", USB 3.0 has a transfer rate of 5 Gbit/sec in full duplex mode and
therefore a tenfold increase in transfer rate compared with USB 2.0.
As with conventional USB cables, the power supply to peripheral devices can be made
via the USB cable. However, the maximum current has been increased from 500 mA to
900 mA. Because of the additional pair of conductors in the USB 3.0 cable, the plugs
are also different to conventional USB plugs.
The Type A plugs have the same structure, but a wider contact level with five adjacent
contacts behind the contact level of the 2.0 plug. These contacts are only activated if
the A plug is plugged in as far as the stop.
With the type B plug, the difference can be seen from the outside. This has an upper
section above the USB 2.0 plug. This upper section accommodates the five additional
contacts for USB 3.0.
The most common USB 3.0 plug types
5 6 7 8 9
4
3
USB 3.0 type A
4
2
9876 5
1 2
USB 3.0 type B
USB 3.0 type micro-B
USB 3.0 type A socket
3
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