USB Standards and Compatibility The USB standard has gone through several revisions: • USB 1.1 was the first widely adopted standard and defined two speeds: Low-Speed USB, running at a maximum of 1.5 Mbps (plenty for keyboards and mice), and Full-Speed USB, running at up to 12 Mbps. • The USB 2.0 standard introduced Hi-Speed USB running at 480 Mbps. • USB 3.0 is capable of speeds of up to 5 Gbps—ten times faster than USB 2.0. USB 3.0 is marketed as SuperSpeed USB. It’s also referred to as USB 3.1 Gen 1, though not on the CompTIA A+ exams. • USB 3.1 can handle speeds up to 10 Gbps. It’s
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