An electrical socket assembly includes an insulating body, a plurality of first terminals, and a plurality of second terminals. The insulating body has first terminal grooves formed on a lower side thereof, and second terminal grooves formed on an upper side thereof. The first terminals are respectively positioned in the first terminal grooves for transmitting non-USB-compliant signals, and the second terminals are respectively positioned in the second terminal grooves for transmitting and receiving USB-compliant signals. The electrical socket assembly may be coupled with a standard USB plug connector for transmission of the USB-compliant signals, and with another plug connector for transmission of the non-USB-compliant signals.