Abstract: Disclosed is a panel feedthrough that provides insulation, strain relief, and selective attenuation of electrical signals by ferromagnetic means. The feedthrough consists of an externally toothed sleeve that has a fixed restraining flange, a ratcheting cap and, optionally, an additional locking ring, both of which engage teeth on the sleeve. Panel clamping action occurs when a panel is pressed between the cap or locking ring and the restraining flange of the sleeve. Various combinations of ferrite toroids or beads may be added over the outside of the sleeve and held in place by the cap or locking ring. The clamping of wires, cables or other objects passing through the feedthrough is accomplished by inward deflecting, tapered tabs located at one end of the sleeve. These tabs are deflected into a clamping action by the cap bearing a tapered hole into which the tabs are forced.

Abstract: A system for the authorization of wireless telephone communications establishes two sets of authorized telephone numbers. A first set of authorized telephone numbers are supplied by the customer, and the second set of authorized numbers are derived from customer bills paid by the customer. The system analyzes transmission characteristics from an unauthenticated cellular telephone and attempts to verify its authenticity based on the transmission characteristic by analyzing the transmission characteristic with respect to stored reference waveforms for the authentic wireless telephone. However, the results of this signature analysis if negative may be overridden if the telephone number dialed by the unauthenticated cellular telephone matches a telephone number in either the first or second sets of authorized telephone numbers. The system also includes a technique for modifying the reference waveforms to compensate for changes in the transmission characteristic.

Abstract: A system and method for the detection of fraudulent use of a wireless telephone system includes a fingerprint analyzer that identifies an unauthenticated wireless telephone as authorized or fraudulent based on a fingerprint of the unauthenticated wireless telephone. The system maintains a valid destination list specific for each authorized wireless telephone. Each valid destination list contains destinations considered to be valid for that particular authorized wireless telephone. When an unauthenticated wireless telephone transmits a call request containing a destination, the system classifies the call as valid when the destination is in the valid destination list for the authorized wireless telephone regardless of whether the fingerprint analyzer identifies the unauthenticated wireless telephone as fraudulent. The system may bypass or terminate the fingerprint analysis, or simply ignore the result of the fingerprint analysis by the fingerprint analyzer.

Abstract: A method and apparatus which provide the ability to disrupt normal completion of a specific call made through a wireless telephone system. The specified call can be forced to be immediately ended, re-routed immediately to a selectable destination, or linked to a local voice frequency interface. The disruption of the call can occur at any point in time over the duration of the call. The decision to disrupt the call, as well as which action to take against the call, can be selected manually by a human or automatically through a standard data interface provided. The call disruption apparatus can be interfaced to the wireless system through a circuit physically connected to the wireless telephone system equipment, or through a modulated radio frequency interface.

Abstract: A cellular phone identity protection system that protects the identities of cellular telephones as they initiate calls through a cellular telephone system. The identity protection is provided through the use of jamming techniques and intentional false and tagged identity transmissions designed to prevent criminals from receiving valid subscribers' mobile identities over the airwaves. Jamming transmissions are made on the same frequency as the mobile transmissions, overpowering the valid mobile signals at the criminals' receivers, thereby preventing the criminals' equipment from properly decoding the MIN, ESN, SCM and other valid data transmitted by the valid mobile unit. These same jamming transmissions are fed, 180 degrees out of phase and level adjusted, into the receive antenna lines of the cell site control channel, canceling the effects of the jamming at the cell site receivers thereby allowing valid mobile call attempts to be processed normally.

Abstract: A method and apparatus for an authorized user of a cellular mobile radiotelephone to easily obtain data and performance evaluation of the telephone, such as the electronic serial number (ESN), the mobile telephone number (MID), and transmitted audio information that permits evaluation of the voice modulation performance of the telephone. By calling a dedicated telephone number, an authorized operator, such as a cellular agent, can contact a computer with voice response capability, which is associated with the electronic mobile exchange (cellular switch). The computer then transmits to the agent a voice prompt requesting a password. Upon correct entry of the password, the computer initiates a trunk trace of the incoming call. The trunk trace identifies the ESN and MID for the telephone used to make the call. The computer reports that data to the calling party, via the cellular network.