① USB type-C Details
The type-C connectors connect to both hosts and devices, replacing various type-B and type-A connectors and cables with a standard meant to be future-proof. The 24-pin double-sided connector is similar in size to the micro-B connector, with a type-C port measuring 8.4 millimetres (0.33 in) by 2.6 millimetres (0.10 in). The connector provides four power/ground pairs, two differential pairs for non-SuperSpeed data (though only one pair is populated 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. Connecting an older device to a host with a type-C receptacle requires a cable or adapter with a type-A or type-B plug or receptacle on one end and a type-C plug on the other end. Legacy adapters with a type-C receptacle are not allowed.
Full-featured type-C cables are active, electronically marked cables that contain a chip with an ID function based on the configuration channel and vendor-defined messages (VDMs) from theUSB Power Delivery 2.0 specification. Type-C devices may optionally support bus power currents of 1.5 A and 3.0 A (at 5 V) in addition to baseline bus power provision; devices can either advertise increased USB current through the configuration channel, or they can support the full power delivery specification using both BMC-coded configuration line and legacy BFSK-coded VBUS line.