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What is USB?

What is USB?
Issue Time:2017-06-06

Micro-USB Definition

USB is an industry standard that defined cables, connectors and communications protocols for connection, communication,and power supply between computers and electronic devices. Micro USB is a portable version of the USB 2.0, USB 3.0 standard, which is smaller than the Mini USB interface used by some phones. 

Micro-USB is the next generation specification for Mini-USB, Micro USB support OTG, and Mini-USB, is also 5pin. Micro-A series includes Micro-B series slots for standard equipment, Micro-AB slots for OTG devices, Micro-A and mini-B plugs, and cables. Micro-series is unique in that they contain a stainless steel shell, The Micro-USB cables product by Shenzhen Kuncan Electronics Co.,Ltd can withstand the use of thousands of times.

1.USB development history and USB Classification

Table A

USB cable type A micro usb cable


2: Changes in USB 3.0 the Low-Speed, Full-Speed, High-Speed and SuperSpeed confusion.

Table B



3.Table C shows maximum data rates for the four data rate types.

Table C


4. Cabling and maximum cable length

Table D shows the maximum cable and total lengths. 

Table D


The USB 3.0 spec does not detail a maximum cable length, but 3.0 meters or 9.8 feet has been recommended.

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