Universal Serial Bus (USB) Flashcards
What type of data transmission does USB use?
Serial data transmission.
What is the role of a USB port in computers?
It standardizes the transfer of data between devices and a computer.
What types of duplex communication does USB support?
USB supports both half-duplex and full-duplex transmission.
What are the four wires in a typical USB cable used for?
Two wires for power (red: +5V, black: ground) and two for data transmission (white: data+, green: data−).
What happens when a USB device is plugged into a computer?
The computer detects the device, loads the appropriate driver, and prompts for a driver if needed.
What is a major convenience of USB connections?
Devices are automatically detected, and drivers are loaded automatically.
How does USB prevent incorrect connections?
USB connections can only fit one way, preventing incorrect connections.
Why is USB considered an industry standard?
It has widespread support and compatibility across devices.
How does USB ensure error-free data transmission?
The USB protocol notifies the transmitter to re-send data if errors are detected.
Do USB connections require external power sources?
No, USB cables supply +5V power to connected devices.
What is the maximum cable length for standard USB connections?
5 meters; beyond that, USB hubs are required to extend the length.
Is USB always backward compatible?
Yes, but very early versions (like USB V1) may not be fully supported by the latest standards.
How do USB transfer rates compare to other technologies like Ethernet?
USB transfer rates (up to 5Gbps for V3 and V4) are slower than some other technologies, like Ethernet.
How can you add more USB ports to a computer?
By using USB hubs, which make it easy to expand the number of ports.
