Definition and Function USB Port. Universal Serial Bus or USB is a port that is designed to allow a wide range of peripherals with a standardized socket that can be connected to both the computer so there is a lot of ports. This will improve the ability to plug and play which allows one device can be connected and removed without having to reboot the computer. USB also provides power supply for the hardware that consumes low power (+ 5 volts, 1 A) without the need to use an external power supply. Plus the ability to enable hardware used without having to install special drivers. function usb port
Given this, the USB ports can be combined as multiple ports to connect a mouse and keyboard (PS / 2), joystick, scanner, printer and others. All can be connected through a standard port, ie USB. In November 1995, the first USB USB 1.0 was introduced with the name promoted by Intel, Microsoft, Philips and US Robotics. USB is intended to replace many existing connectors on the back of the computer, thus triggering confusion and inconvenience users. In 1998, emerging USB 1.1 solve problems with the previous version. In April 2000, the emerging USB 2.0 is standardized by the USB-Implementers Forum (USB-IF) at the end of 2001 In November 2008, emerging USB 3.0 which currently use is not evenly distributed on all devices.
Usb transfer speed
Below is capable of data transfer speeds delivered by USB, namely:
- Low Speed (Low Speed) run at 1.5 Mbit per second or 187 kB per second is often used on the keyboard, mouse and joystick that supports USB 1.1 and USB 2.0.
- Full Speed (Full Speed) run at 12 Mbit per second or (1.5 MB per second). Full speed is the fastest USB 2.0 before it appears. Currently, all types of USB support these speeds.
- High speed (Hi-Speed) run at 480 Mbit per second (60 MB per second) that is used in some devices that require data transfer speed external storage devices such as flash drive, external hard drive and an external DVD that supports USB 2.0.
- Ultra Speed (Ultra Speed) run at a speed of 5 Gbit per second (625 MB per second) that is used on some external storage devices such as flash drive that supports USB 3.0 standard.
At any higher version supports speed version underneath, according to the device connected to it. Philosophy in the exchange of data in a computer is "adjusting to the slowest". Similarly, our brief review of the USB. May be useful.