The SBU1 and SBU2 pins can be used both for communication between two connected devices, and for transmitting analog signals from the left and right channels.Four pairs of pins of high-speed data exchange (blue in the picture) are used simultaneously.Contacts in the center (D+ and D-) - data of the USB 2.0 interface and earlier versions are also duplicated, but crosswise.Power supply (+V) is symmetrical and duplicated on both sides of the connector.Ground pins (GND) are symmetrical and duplicated on both sides of the connector.
