Communication card and structure of jack for use in the same

A jack for use in a card, the card having two major planes and an end face providing a thickness of the card, an upper limit of the thickness being restricted, the card including an aperture having a slit-like shape and formed in the end face, said jack comprising:

• a base plate having a top plane and a bottom plane parallel to the major planes and an end face providing a thickness of the base plate, said thickness of said base plate being smaller than the width of the aperture;
• said base plate being inserted into the aperture in such a manner as to be accommodated into an interior of the card and to be removed from the card;
• and
• a notch provided on said base plate so as to be directed outward when viewed from the card, said notch extending through said base plate in its thickness direction, said notch being provided with an inner surface configured to be capable of receiving a plug having a substantially rectangular parellelpiped shape and having edges,
• the plug being connected and electrically coupled to a cord which extends into the plug, wherein said notch is configured and oriented such that upon insertion and retention of the plug in said notch the cord extends into the plug in a direction parallel to said major planes and such that the plug is inserted in said notch in a direction which is regulated by utilizing at least a part of said inner surface.