Abstract: A receptacle for receiving telephone plug and wide-band cable plug includes a body with a terminal having at least 8 pins connected to the body and an inlet defined in the body. A first recess and a second recess are respectively defined in the body so as to respectively receive a first checking member and a second checking member. The first checking member has a first contact portion and the second checking member has a second contact portion which extends in the inlet so that when a smaller telephone line plug is inserted in the inlet, the second contact portion is not pushed, and the second contact portion is pushed to contact the first contact portion when a lager wide-band cable plug is inserted in the inlet.

Abstract: A socket has a body, an enlarged pin, a detecting pin and multiple contact pins. The enlarged pin and the detecting pin are separately secured in the body. The contact pins are secured in the cavity of the body in a row between the enlarged pin and the detecting pin. The enlarged pin is longer than each contact pin so that an enlarged section is formed on the enlarged pin. A lateral rod is formed on the detecting pin and extends to a position below the enlarge section of the enlarged pin. Consequently, the socket can automatically indicate whether a plug inserted into the socket is a cable plug or a telephone plug. The socket can be used with different types of modular communications plugs. The cost for manufacturing the computer or a modem that can accommodate different transmission media is reduced.