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Developers of products that use the USB specification must sign an agreement with the USB-IF. Developers of USB devices intended for public sale generally must obtain a USB ID, which requires that they pay a fee to the USB Implementers Forum (USB-IF). For example, a USB-to-parallel-port converter might work well with a printer, but not with a scanner that requires bidirectional use of the data pins.įor a product developer, using USB requires the implementation of a complex protocol and implies an "intelligent" controller in the peripheral device.
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While converters exist between certain legacy interfaces and USB, they might not provide a full implementation of the legacy hardware.A host cannot broadcast signals to all peripherals at once-each must be addressed individually.
Some extension to this limitation is possible through USB On-The-Go in, Dual-Role-Devices and protocol bridge.
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The USB standard also provides multiple benefits for hardware manufacturers and software developers, specifically in the relative ease of implementation: When a user plugs a device into a port on a running computer, it either entirely automatically configures using existing device drivers, or the system prompts the user to locate a driver, which it then installs and configures automatically.
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The Universal Serial Bus was developed to simplify and improve the interface between personal computers and peripheral devices, such as cell phones, computer accessories, and monitors, when compared with previously existing standard or ad hoc proprietary interfaces. Main article: USB hardware § Connectors Available connectors by USB standard
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USB connectors have been increasingly replacing other types as charging cables of portable devices. Examples of peripherals that are connected via USB include computer keyboards and mice, video cameras, printers, portable media players, mobile (portable) digital telephones, disk drives, and network adapters. It has largely replaced interfaces such as serial ports and parallel ports, and has become commonplace on a wide range of devices. USB was designed to standardize the connection of peripherals to personal computers, both to communicate with and to supply electric power. 12 Comparisons with other connection methods.