USB Protocol
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Universal Serial Bus Protocol and Products

USB Protocols source code C

USB is a fast, bi-directional, isochronous serial bus designed to ease the connection of multiple peripherals including telephony, digital communications, multi-media, and gaming devices. USB provides a simple and inexpensive way to connect up to 127 devices to a single computer port. Keyboards, mice, tablets, digitisers, scanners, bar-code readers, modems, printers and more can all run at the same time. USB devices plug into any pl1atform that supports the standard, from notebooks to desktop PCs to workstations.

Currently, the USB specification is at version 2.0 (with revisions) with a maximum transfer rate of 480 Mbit/s. Hewlett-Packard, Intel, Lucent, Microsoft, NEC, and Philips jointly led the initiative to develop a higher data transfer rate than the 1.1 specification. The USB 2.0 specification was released in April 2000 and was standardised by the USB-IF at the end of 2001. Previous notable releases of the specification were 0.9, 1.0, and 1.1. Equipment conforming with any version of the standard will also work with devices designed to any previous specification.

The latest specification of USB is USB On-The-Go (USB-OTG). This allows USB enabled products to be connected directly together without the need for a PC host. New electrical specifications have been defined as well as changes to the protocol.

Smaller USB plugs and receptacles, called Mini-A and Mini-B, are also available, as specified by the On-The-Go Supplement to the USB 2.0 Specification. As of 2006, the specification is at revision 1.2.

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