31-08-2017, 12:39 PM
USB, an abbreviation for Universal Serial Bus, is an industry standard that defines cables, connectors, and communications protocols for connecting, communicating, and powering computers and devices.
USB was designed to standardize the connection of computer peripherals (including keyboards, pointing devices, digital cameras, printers, portable media players, disk drives and network adapters) to personal computers, both for communication and for power supply. It has largely replaced a variety of earlier interfaces, such as serial ports and parallel ports, as well as separate power chargers for handheld devices - and has become commonplace across a wide range of devices. Created in the mid 90's, it is currently developed by the USB Implementers Forum (USB IF).
In general, there are three basic formats of USB connectors: the default or the standard format for desktop or laptop computers (eg USB flash drives), the mini for mobile devices (now disapproved, except the Mini-B, which is used in many cameras), and micro-thinner size, for low-profile mobile equipment (most modern mobile phones). In addition, there are 5 modes of USB data transfer, in order of increasing bandwidth: low speed (from 1.0), maximum speed (from 1.0), high speed (from 2.0), SuperSpeed (from 3.0) and SuperSpeed + (from 3.1); the different modes of hardware and cabling. USB devices have some option of implemented modes, and the USB version is not a reliable statement of the modes implemented. Modes are identified by their names and icons, and specifications suggest that plugs and receptacles must be color-coded (SuperSpeed is identified by blue).
USB was designed to standardize the connection of computer peripherals (including keyboards, pointing devices, digital cameras, printers, portable media players, disk drives and network adapters) to personal computers, both for communication and for power supply. It has largely replaced a variety of earlier interfaces, such as serial ports and parallel ports, as well as separate power chargers for handheld devices - and has become commonplace across a wide range of devices. Created in the mid 90's, it is currently developed by the USB Implementers Forum (USB IF).
In general, there are three basic formats of USB connectors: the default or the standard format for desktop or laptop computers (eg USB flash drives), the mini for mobile devices (now disapproved, except the Mini-B, which is used in many cameras), and micro-thinner size, for low-profile mobile equipment (most modern mobile phones). In addition, there are 5 modes of USB data transfer, in order of increasing bandwidth: low speed (from 1.0), maximum speed (from 1.0), high speed (from 2.0), SuperSpeed (from 3.0) and SuperSpeed + (from 3.1); the different modes of hardware and cabling. USB devices have some option of implemented modes, and the USB version is not a reliable statement of the modes implemented. Modes are identified by their names and icons, and specifications suggest that plugs and receptacles must be color-coded (SuperSpeed is identified by blue).