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USB 3.0: that waits for us in the future
|/img >/img src="//images/stories/tip/comp-progs/usb-3.0_small.jpg" alt="USB 3.0" align=left title="USB 3.0" />The USB interface now is the most widespread interface for connection of peripherals to the computer. Through USB it is possible to connect printers, scanners, mice, keyboards, external stores... The habitual USB 2.0 interface will be succeeded by the new, advanced USB 3.0 interface soon.|
The abbreviation of USB designates "the universal consecutive tire". This interface serves for connection of the low-speed and medium-rate periphery. In 1996 the USB 1.0 specification was issued. It supported data transmission with a speed up to 12 Mbps. The high-speed mode of the USB 2.0 interface presented in 2000 supports data transmission to 480 Mbps. Now this interface is most widespread and is used in the majority of peripheral devices. But it will be succeeded by the high-speed new USB 3.0 interface soon.
The final USB 3.0 specification was submitted in 2008, but it still did not come to mass use. What main features of the USB 3.0 interface? That to us to expect from it?
Need of introduction of the USB 3.0 interface is caused by that higher speed of data transmission is necessary for many modern devices. Besides, for them food which can provide USB 2.0 does not suffice already. The USB 3.0 interface supports higher speed of data transmission - to 4,8 Gbit / page. It is reached including at the expense of additional communication lines. The standard USB 2.0 cable contains four lines - twisted couple for transfer and reception of data, and also two lines of food (plus and zero). The USB 3.0 cable is thicker because two twisted couples more were added to it (i.e. four new communication lines). However the USB 3.0 cable will be shorter (the maximum length - 3 meters in comparison with 5 meters for USB 2.0). In USB 3.0 decided to refuse use of an optical fiber as it is very expensive to mass use.
Controlers and USB 3.0 sockets are compatible to USB 2.0 both physically, and is functional. The fork of USB 3.0 contains contacts of the USB 2.0 standard, but in the depth of the socket there was one more contact row with five contacts. The socket of a cable will allow to define the version of the USB standard at first sight. However such arrangement of contacts means that the fork of USB 3.0 needs to be inserted into the relevant port "against the stop". If to insert a fork into the port not completely, an additional contact row will not be involved therefore the speed of data transmission will correspond to the USB 2.0 interface.
A little in more detail about compatibility of devices with USB 2.0 and USB 3.0 interfaces. Devices with the USB 2.0 socket of type A (for example, a flash card) it will be possible to connect in USB 3.0 port and vice versa, however in this case the speed of transfer and reception of data will correspond to the USB 2.0 interface. The device with the USB 2.0 socket of type B (for example, the printer) is connected in USB 3.0 port, and here on the contrary it will be impossible to make. Also the USB 3.0 cable will not work if to connect it to the USB 1.1 controler.
Also in USB 3.0 current was increased (900 ma in comparison with 500 ma in USB 2.0). It will allow to refuse additional power units and USB sockets in many devices. Current is especially important for portable hard drives. It will allow to charge also quicker mobile devices from USB.
Introduction of the USB 3.0 interface will inevitably lead to emergence of new USB hubs (concentrators) with support of USB 3.0 which allow to connect some devices in one USB controler. Concentrators with support of the USB 3.0 interface will be more difficult as they should support at the same time and USB 2.0. Therefore it is quite probable that the first generations of such hubs will be expensive.
However the USB 3.0 interface is not supported by all operating systems and motherboards yet. Some producers already put on the market motherboards with support of USB 3.0, however some firms do not hurry to introduce support of USB 3.0 in the chipsets, considering that it is the standard not at once will become mass.
The new kernel of Linux, according to developers, already supports the USB 3.0 interface. And here Windows 7 cannot brag of it so far: the final USB 3.0 specification was declared shortly before an exit of this operating system therefore developers did not manage to introduce support of the new interface. However it is quite possible that support of USB 3.0 will become available by installation of the OS updatings. However it is not known, whether realize support of USB 3.0 and the SuperSpeed technology for Windows XP and Windows Vista.
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