USB 2.0 differential pair, position 1, negative USB 2.0 differential pair, position 2, negative USB 2.0 differential pair, position 1, positive SuperSpeed differential pair 1 RX, negative SuperSpeed differential pair 1 TX, negative SuperSpeed differential pair 1 RX, positive SuperSpeed differential pair 1 TX, positive Type-A and Type-B adaptors and cables will be required for older devices in order to plug into Type-C hosts adaptors and cables with a Type-C receptacle are not allowed. The 24-pin double-sided connector provides four power/ground pairs, two differential pairs for USB 2.0 data bus (though only one pair is implemented in a Type-C cable), four pairs for high-speed data bus, two sideband use pins, and two configuration pins for cable orientation detection, dedicated biphase mark code (BMC) configuration data channel, and VCONN +5 V power for active cables. The Type-C plug connects to both hosts and devices, replacing various Type-B and Type-A connectors and cables with a standard meant to be future-proof, similar to Apple Lightning and Thunderbolt. Developed at roughly the same time as the USB 3.1 specification, but distinct from it, the USB Type-C Specification 1.0 defines a new small reversible-plug connector for USB devices.
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