"odular jack in a sectional view and an equivalent circuit diagram; FIG. 3 is an equivalent circuit diagram, when a high-frequency signal is applied to the conventional modular jack; FIGS. 4 a and 4 b are an exploded perspective view and a perspective view, respectively, showing the preferred embodiment of a modular jack, according to the present invention; FIGS. 5 a and 5 b are perspective views s" . . . . .