Universal Serial Bus (USB)

Universal Serial Bus (USB) is an industry standard that establishes specifications for cables, connectors and protocols for connection, communication and power supply (interfacing) between computers, peripherals and other computers.

• How does a USB keyboard work?- YouTube by Ben Eater
• More about USB than you ever wanted to know
  • I learned how there are 4 pins, if it’s just for power, the data pins are not actually used. If you actually cut into the wire, there are only 2 wires

There’s shielding around the cable to prevent interference.

Is USB a protocol?

I don’t think so right? Because there are many ways in which data is transmitted through USB.

https://www.tuxera.com/blog/comparing-protocols-for-usb-devices-which-ones-more-significant/

Different USB speeds

• USB 2.0 cables transfer data at ~0.048 GB/s = 4.8 MB/s
• USB 3.0 has transmission speeds of up to ~0.625 GB/s = 62.5 MB/s
• USB 3.1 at ~1.25 GB/s
• USB 3.2 takes advantage of all four lanes to achieve ~2.5GB/s
• USB 4.0 up to ~5 GB/s

Concepts

• Older USB’s have a Ferrite Bead.