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A universal serial bus (USB) 2.0 is a hardware serial interface used to connect peripheral devices to computers and other digital devices. The 2.0 is in reference to the original standard version of the USB interface.
The USB 2.0 is one of the most widely used external serial interfaces for attaching peripherals to a computer. The USB 2.0 data port is used to connect a variety of peripheral devices such as mice, keyboards, printers, scanners, external hard drives, video game consoles, digital cameras, mobile devices and network adapters. Another widespread and convenient USB device is the flash drive or memory stick.
The USB 2.0 device can be plugged into a USB socket and used as a USB power supply for direct current (DC) in connecting equipment such as speakers or recharging batteries in devices like keyboard lamps and miniature refrigerators.
The USB 2.0 standard can support up to 127 devices and has three different data transfer rates (DTR’s):
The USB 2.0 has a variety of features, including plug-and-play and the ability to transfer files between devices. It is also hot swappable, has increased DTR’s compared to USB 1.1 and is backwards compatible with USB 1.1. However, the USB 2.0 device will only transfer data at 1.5 Mbps if a USB 1.1 port is used.
In 2007 a standard was implemented for the USB 2.0 High Speed Inter Chip (HSIC) using a chip-to-chip alternative plus removing analog transceivers found in previous versions.
Currently, the USB 3.0 or SuperSpeed is the latest USB revision. It has a DTR of 5 Gbps, which is ten times faster than the USB 2.0.