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USB Cables

USB is the most-implemented interconnect for computers and other consumer electronics. The latest version, USB 3.1, also called SuperSpeed USB, extends the data transfer rate to 10 Gbps, more than 20 times the rate of USB 2.0.  USB 3.1 includes improved device synchronization, better power management and backwards compatibility with USB 2.0.

In order to offer higher speeds and more power to the device, improved cable types and connectors with additional pins are required. The new cables require controlled impedance and shielded twisted pairs for data transmission.  The new connectors are designated Standard A for the computer end and Standard B and Micro B for the device end.  The Standard A and Standard B look like the connectors used with USB 2.0 (and USB 1.0 and 1.1) except that they include extra pins.  The new connectors can be used in older devices but USB 3.0 devices require the new connectors.  The USB 3.0 B connectors also look like the older B connectors except that the Standard B has extra pins and the Micro B has a new section added next to the USB 2.0 Micro B section. The newest connector, Type C increases the power delivery capability and adds control features.

USB 3.0 Connectors

std-a.jpg std-b.jpg mic-b.jpg
Standard A Standard B Micro B

 

Those interested in the details of the cable and connector requirements should visit the official USB website - www.usb.org. This presentation list has all of the performance and configuration details. 

 

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