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USB Battery Charging (BC) defines a charging port, which may be a charging downstream port (CDP), with data, or a dedicated charging port (DCP) without data. Dedicated charging ports can be found on USB power adapters to run attached devices and battery packs. Charging ports on a host with both kinds will be labeled. [51]
Few USB devices made it to the market until USB 1.1 was released in August 1998. USB 1.1 was the earliest revision that was widely adopted and led to what Microsoft designated the "Legacy-free PC". [22] [23] [24] Neither USB 1.0 nor 1.1 specified a design for any connector smaller than the standard type A or type B.
The USB 3.1 specification takes over the existing USB 3.0's SuperSpeed USB transfer rate, now referred to as USB 3.1 Gen 1, and introduces a faster transfer rate called SuperSpeed USB 10 Gbps, corresponding to operation mode USB 3.1 Gen 2, [62] putting it on par with a single first-generation Thunderbolt channel.
USB 3.0 SuperSpeed (aka USB 3.1 Gen 1, USB 3.2 Gen 1x1) 5 Gbit/s: 500 MB/s: 2010 eSATA (SATA 600) 6 Gbit/s: 600 MB/s: 2011 CoaXPress full (up and down bidirectional link) 6.25 Gbit/s + 20.833 Mbit/s: 781 MB/s: 2009 External PCI Express 2.0 ×2: 8 Gbit/s: 1 GB/s: USB 3.1 SuperSpeed+ (aka USB 3.1 Gen 2, USB 3.2 Gen 1x2, USB 3.2 Gen 2x1, USB4 Gen ...
Full speed (FS) rate of 12 Mbit/s is the basic USB signaling rate defined by USB 1.0. All USB hubs can operate at this rate. High speed (HS) rate of 480 Mbit/s was introduced in 2001 by USB 2.0. High-speed devices must also be capable of falling-back to full-speed as well, making high-speed devices backward compatible with USB 1.1 hosts ...
A four-port "long cable" "external box" USB hub A four-port "compact design" USB hub: upstream and downstream ports shown. A USB hub is a device that expands a single Universal Serial Bus (USB) port into several so that there are more ports available to connect devices to a host system, similar to a power strip. All devices connected through a ...