Abstract: A connector includes a plastic body, a front part of which is covered with a steel case and a rear part of which has an insertion plate connected thereto. A common ground connection means is associated with a rear side of the insertion plate by locating staggered upper and lower common ground terminals at the front edge of the common ground connection means in some of the terminal slots on the insertion plate to thereby electrically contact with rear ends of connection terminals provided on the plastic body and seated in the same terminal slots. Ground wires in multiple-core cables are connected to the terminal slots that have both the common ground terminal and the connection terminal seated therein and other information wires in the multiple-core cables are connected to the terminal slots that have only the connection terminal seated therein. Thereby, noise interference may be effectively reduced and transmission speed may be increased.