Patent ID: 7131872

Claim:
A modular jack connector capable of preventing incorrect insertion of a smaller sized plug connector, comprising: an insulating housing having a front mating portion and a receiving cavity defined in the front mating portion; an insulating terminal seat disposed in the insulating housing, the insulating terminal seat having a horizontal base and a vertical shoulder extending upward from a rear portion of the horizontal base; a plurality of contacts disposed in the insulating terminal seat and extending into the receiving cavity; a shielding shell for covering the insulating housing; and two metal anti-mismating elements mounted to two opposite sides of the insulating terminal seat, each anti-mismating element having a first end portion fixed to the insulating terminal seat and a second end portion extending into the receiving cavity, a free end of the second end portion being bifurcated with an inner bifurcation bent downward and vertically to form a stopper and an outer bifurcation extending forward and downward to form an inclined guide, the distance between the two stoppers of the two anti-mismating elements being smaller than that between the two inclined guides and equaling the width of the smaller sized plug connector; wherein a receiving trough and a guiding trough are defined in each of two opposite sides on a front portion of the horizontal base, the two stoppers are received in the two receiving troughs, and the two inclined guides are received in the two guiding troughs.