These pull up resistors at the device end will also be used by the host or hub to detect the presence of a device connected to its port. SuperSpeed (USB 3.0) rate of 4800 Mbit/s (~572 MB/s).Ī USB device must indicate its speed by pulling either the D+ or D- line high to 3.3 volts.

Hi-Speed (480 Mbit per second) was added in USB 2.0 specification. Low Speed (1.5 Mbit per second) that is mostly used for Human Input Devices (HID) such as keyboards, mice, joysticks and often the buttons on higher speed devices such as printers or scanners įull Speed (12 Mbit per second) which is widely supported by USB hubs.

D+ and D- operate together they are not separate simplex connections. Half-duplex differential signalling is used to reduce the effects of electromagnetic noise on longer lines. In a USB data cable Data+ and Data- signals are transmitted on a twisted pair with no termination needed. It uses 4 shielded wires: two for power (+5v & GND) and two for differential data signals (labelled as D+ and D- in pinout). USB Connector Pinouts USB Connector Pinouts

Usb 2 vs usb 3 wiring