USB Cable pin configuration

Pin	Function	Pin	Function
1	+5 Volts	2	Data -
3	Data +	4	Ground

The USB cable is typically shielded in three layers. A basic shielding material covers the four internal wires. A copper mesh jacket then covers the shielding, which in turn is sleeved in a PVC wrap to protect the copper.

The Data+ and Data- wires are in a twisted pair arrangement within the cable. These two wires are usually 28AWG lines. The +5V and GND are not twisted within the sleeves, but are run parallel to the twisted pair data lines.