| 摘要 |
A retrofit telephone network interface apparatus for use in the subscriber loop of a telephone transmission system, i.e., connected to a non-telephone company owned premise wiring (a consumer household) and a telephone company owned portion of such loop at the junction where the two connect to each other. The apparatus is superimposed upon an existing station overvoltage protector and provides limited access, i.e., only a portion of the apparatus is made readily accessible to the consumer by providing a cover readily opened by him and a shield cover which may be readily opened by telephone company employees in order to provide access to electronic components owned by the telephone company. The device includes a base structure which includes a first and second set of terminals and a plug and receptacle arrangement for disconnecting the premise wiring from the telephone transmission system. The first set of terminals and the plug and receptacle are accessible to the consumer and access is denied to the remaining portion of the base member which includes a second set of terminals and a plurality of electronic components, unless opened by a telephone company employee having the proper tool therefor.
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