Universal Serial Bus (USB)

Universal Serial Bus (USB)

Universal Serial Bus (USB)

What is USB?

• The Universal Serial Bus (USB) is a widely used standard for transmitting data between devices

• It is a serial communication method, and it operates asynchronously

• Many devices use USB such as:

  • Keyboards

  • Mice

  • Video cameras

  • Printers

  • Portable media players

  • Mobile phone

  • Disk drives

  • Network adapters

• Different USB connector types exist for different devices

• The letters refer to the physical shape and design of the USB connector:

  • USB-A - Commonly used for flash drives, mice, keyboards, external HDD

  • USB-B - Found in printers, scanners, and older external storage devices

  • USB-C - Latest standard, known for it's small size, transfer speeds, and it's ability to carry power

• The term USB can also be followed by numbers (USB 2.0, 3.0, 4 etc.)

• The numbers refer to the generation of USB technology, which determines the speed and performance:

  • USB 1.1 - 12 Mbps (very slow)

  • USB 2.0 - 480 Mbps (very common but slower compared to modern versions)

  • USB 3.0/3.1/3.2 - 5 Gbps to 20 Gbps (much faster, used for external HDDs and gaming devices)

  • USB4/ USB4 2.0 - Up to 80 Gbps (the latest and fastest, used for high speed data transfer)

• When a device is connected to a USB port the computer:

  • Automatically detects that the device has been connected

  • Looks for the correct driver:

    • If the driver is already installed, the appropriate device driver is loaded so that the device can communicate with the computer

    • If the device is new, the computer will look for a compatible device driver

    • If one cannot be found, the user must download and install an appropriate driver manually

Advantages and disadvantages of USB