- 1 General Features USB port
- 2 Features USB ports by type
- 3 versions of USB
- 4 References
The general features of the USB port
There are some general features of the port USB, including the following: 
- Computer Kmstadhav works.
- You can connect up to 127 devices hosting service, either directly, or via USB hubs.
- You can reach USB cables to individual approximate distance of 5 meters, but with axes can be up to 30 meters, approximately six cables away from the host.
- The maximum data transfer rate of USB 2.0 is about 480 megabits per second, which is about ten times the speed of USB 1.0.
- 2.0 USB cable contains two wires for power, two + 5 volts and ground, and a pair of twisted wire for data transmission, and adds USB version 3.0 four other wires to transfer data, while USB 2.0 can only send data in one direction at a time with the current or against power, the USB 3.0 data transfer they can in both directions simultaneously.
- The computer can supply up to 500 million amps of power, in a 5-volt electricity wires, the USB 3.0 cable to provide up they can to 900 mAh of energy.
- Devices can low power, such as the mouse that derives its power directly from the carrier, but for devices of high energy, such as printers. They have their own power supply, and pulls the minimum energy of the carrier, and can be hubs with an energy supply to provide power for devices connected to the bus .
- USB devices can be connected to the bus and separated at any time, which means they are readily interchangeable.
- It can convert many USB devices to sleep mode, by the host computer when the computer turns into a power-saving mode.
- Devices connected to the USB port depends on the cable for the transfer of power and data.
Features USB ports by type
Features a USB port depends on the type, which is as follows: 
- Type I USB-A: is the least common type of second type, usually this type devices almost square-shaped, commonly used for wired mouse, and keyboards.
- Type II USB-B: This connector rectangle is usually available for a length of about 1.4 cm, and the height of approximately 0.65 cm, usually located on the devices guidance, computers, printers, game consoles, and is usually characterized by this type the presence of a stick USB.
- Type III Micro USB: This name is called on both versions of the first and second types, which are available, including smaller versions for the original base, usually used on mobile devices.
- Type IV USB Type C: It is a type with dimensions of 0.84 * 0.26 cm, this has been the standard design, and is the latest to replace both type I and II, small ports, to support the factors that promote thinning in mobile devices.
Versions of USB
There are types of USB ports by versions, which are as follows: 
- USB 1.1: Released in August 1998, the first USB version, which was adopted widely, and has never been providing the original version 1.0 as a product for consumption, and a maximum speed of 12 Mbps, and is no longer this version spread dramatically.
- USB 2.0: released in the month of April 2000, and the maximum speed to 480 Mbps in the development of High Speed (English: Hi-Speed), or 12 Mbps full-speed mode (in English: Full-Speed), and currently has the maximum power mode 5V , 1.8A.
- USB 3.0: released in November 2008, and has a maximum of 5 speed Gigabit in the development of SuperSpeed, usually have port semiconductor in blue, and compatible USB 3.0 with USB 2.0, and can implementer be up to 5 volts of energy.
- USB 3.1: released in the month of July 2013, and its speed is twice the speed of USB 3.0, where up to 10 Gbps.
- ↑ MARSHALL BRAIN, "How USB Ports Work"، www.computer.howstuffworks.com, Retrieved 3-12-2017. Edited.
- ↑ Bradley Mitchell (12-10-2017), "What is a USB Port?"، www.lifewire.com, Retrieved 3-12-2017. Edited.
- ↑ DONG NGO (26-10-2016), "USB Type-C and Thunderbolt 3: One port to connect them all"، www.cnet.com, Retrieved 3-12-2017. Edited.
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