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2. USB - Wikipedia

   en.wikipedia.org/wiki/USB

   A USB system consists of a host with one or more downstream facing ports (DFP), [61] and multiple peripherals, forming a tiered-star topology. Additional USB hubs may be included, allowing up to five tiers. A USB host may have multiple controllers, each with one or more ports. Up to 127 devices may be connected to a single host controller.

3. USB mass storage device class - Wikipedia

   en.wikipedia.org/wiki/USB_mass_storage_device_class

   Devices connected by a single USB port may function as multiple USB devices, one of which is a USB mass-storage device. This simplifies distribution and access to drivers and documentation, primarily for the Microsoft Windows and Mac OS X operating systems.

4. USB-to-serial adapter - Wikipedia

   en.wikipedia.org/wiki/USB-to-serial_adapter

   When the USB to serial adapter is connected to the computer via the USB-port the driver on the computer creates a virtual COM port which shows up in Device Manager on Windows, and under /dev on Linux and MacOS. This virtual COM port can be accessed and used as if it was a built-in serial COM-port.

5. Turn a single USB-C port into a 12-in-1 connectivity hub for ...

   www.aol.com/turn-single-usb-c-port-100000229.html

   TL;DR: As of Dec. 19, you can get the MoovyGo 12-in-1 USB-C Hub Station with Wireless Charging and Power Bank for just $150.95.With the number of ports on our computers dwindling, figuring out how ...

6. USB communications - Wikipedia

   en.wikipedia.org/wiki/USB_communications

   USB signals are transmitted using differential signaling on a twisted-pair data cable with 90 Ω ± 15% characteristic impedance. [6] Low speed (LS) and Full speed (FS) modes use a single data pair, labelled D+ and D−, in half-duplex. Transmitted signal levels are 0.0–0.3 V for logical low, and 2.8–3.6 V for logical high level.

7. USB Attached SCSI - Wikipedia

   en.wikipedia.org/wiki/USB_Attached_SCSI

   USB 3.0 SuperSpeed – host controller (xHCI) hardware support, no software overhead for out-of-order commands; USB 2.0 High-speed – enables command queuing in USB 2.0 drives; Streams were added to the USB 3.0 SuperSpeed protocol for supporting UAS out-of-order completions USB 3.0 host controller (xHCI) provides hardware support for streams