USB — Knowing the Basics of Universal Serial Bus
Universal Serial Bus (USB) is an industry standard that establishes specifications for cables and connectors and protocols for connection, communication and power supply ( interfacing ) between computers, peripherals and other computers. A broad variety of USB hardware exists, including eleven different connectors , of which USB-C is the most recent. Figure 1. Lenovo T495 Figure 2. Lenovo ports layout Always On USB 3.1 connector (Figure 2.9) There is a feature called "Always On USB" which allows devices connected to the laptop via USB to be powered over USB even when the Operating system (Windows 10 in my case) shuts down . USB 2 and USB 3 Compatibility USB 3.0 backwards is compatible—meaning it's designed to work with older USB versions including USB 2.0 and USB 1.1. You can plug a USB 2.0 device into a USB 3.0 port and it will always work, but it will only run at the speed of the USB 2.0 technology. USB 3.0 Flash Drives and card readers are backwards compati...