There are some important features of universal serial bus (USB) which are given below,
- A maximum 127 peripherals can be connected to a single universal serial bus (USB) host controller.
- USB can draw power by its own supply or from a computer. USB devices use power up to 5 voltages and deliver up to up to 500 mA.
- USB devices are hot swappable due to this we do not have to turn off, on or restart our computer when connecting or disconnecting a USB device.
- Individual USB cables can run as long as 5 meters with hubs, devices can be up to 30 meters away from the host.
- The speed of USB for USB 1.0 is 12 Mb per second and for USB 2.0 is 480 Mb per second.
- Many of the USB devices can be put to sleep by the host computer when the computer enters into a power saving mode.
- A USB 2.0 cable has two wires for power i.e. +5 volts and ground and a twisted pair of wires to carry the data. The USB 3.0 standard which has four wires for data transmission.
