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A number of extensions to the USB Specifications have progressively further increased the maximum allowable V_BUS voltage: starting with 6.0 V with USB BC 1.2, [43] to 21.5 V with USB PD 2.0 [44] and 50.9 V with USB PD 3.1, [44] while still maintaining backwards compatibility with USB 2.0 by requiring various forms of handshake before ...
This is a principle of backward compatibility. The Standard-A plug is used for connecting to a computer port, at the host side. A USB 3.0 Standard-B receptacle accepts either a USB 3.0 Standard-B plug or a USB 2.0 Standard-B plug. Backward compatibility applies to connecting a USB 2.0 Standard-B plug into a USB 3.0 Standard-B receptacle.
The USB port is fully compatible with USB 5 Gbit/s (USB 3.0), USB 480 Mbit/s (USB 2.0) and USB 12 Mbit/s (1.1); USB 3.0 devices are compatible, but will operate at USB 2.0 speed if internal USB 3.0 connector is not connected.
The USB 2.0 specification is backward-compatible with USB 1.0/1.1. ... (such as typical 2.5-inch hard disk drives). USB up to 2.0 allows a host or hub to provide up ...
In August 2014, the USB 3.0 Promoter Group announced the completion of the USB Type-C connector and cable specification. Type-C cables and connectors are reversible and are electrically backward compatible, but not physically backward compatible, with previous USB plugs and receptacles. New-to-existing cables and adapters have been defined.
[2]: 12 [8] Buses exposed through the M.2 connector include PCI Express (PCIe) 3.0 and newer, Serial ATA (SATA) 3.0 and USB 3.0; all these standards are backward compatible. The M.2 specification provides up to four PCI Express lanes and one logical SATA 3.0 (6 Gbit/s) port, and exposes them through the same connector so both PCI Express and ...