Telephonic communications – Telephone line or system combined with diverse electrical... – Remote control
Patent
1994-05-17
1998-03-17
Woo, Stella
Telephonic communications
Telephone line or system combined with diverse electrical...
Remote control
379 9001, 37910601, 340531, 34082536, H04M 1100
Patent
active
057295964
ABSTRACT:
Electrical appliances each include an identity module which carries a code. Whenever mains electrical power is reconnected to one of the appliances, FSK signals are sent via the main electricity circuit to a security mains-telephone transfer point module which then causes a call to be set up via a telephone network to a remote security unit. The remote security unit uses customer line identity (CLI) signals from a telephone network interface to identify a code which it returns via the telephone network to the security mains-telephone transfer point module associated with the appliance site. The security mains-telephone transfer point module forwards the received code using FSK signals to the requesting appliance by way of the mains electrical circuit. If an incorrect code (or no code) is received, the identity module in the appliance inhabits the supply of power to its operational circuits.
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patent: 5022067 (1991-06-01), Hughes
patent: 5351289 (1994-09-01), Logsdon et al.
patent: 5406269 (1995-04-01), Baran
patent: 5406619 (1995-04-01), Akhteruzzaman et al.
patent: 5410326 (1995-04-01), Goldstein
Bloom et al, "A Network Solution for Improved Security for Computer Access" Computer Communications for the 90's, Nov. 1988, Amsterdam NL, pp. 379-382 .
Hopkins Jonathan
McGlaughlin David
Reeder Stephen M.
British Telecommunications public limited company
Woo Stella
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