Telephone jack security device

作者: Calvin Flowers

DOI:

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摘要: A standard phone jack is provided with a lock cylinder having rotatable contact arm which capable of rotating between first open circuit position when in its locked and second closed where it engages wire to provide access dial tone. In such manner, completely cuts off all the outgoing line so that no calls may be made or received by unauthorized users, nor can charge collect accepted users.

参考文章(9)
Susan L. Kidney, Modular telephone jack lock ,(1980)
Thorntone E. Murray, Telephone line security system ,(1989)
Terry M. Gernstein, Barry M. Epstein, Pushbutton telephone set disabling means ,(1980)
Vincent Hileman, Clifford Willis, David Evans, Benjamin Stolz, Methods and apparatus for providing a secure telecommunications port ,(1992)