PSTN APPLIANCE SECURITY SYSTEM
WITH REDUCED PSTN TRAFFIC LOADING
 Inventors: Stephen M Reeder, Essex; Jonathan Hopkins; David W Bradley, both of Suffolk, all of United Kingdom
 Assignee: British Telecommunications public limited company, London, United Kingdom
 Appl. No.: 09/043,180
 PCT Filed: Feb. 4, 1998
 PCT No.: PCT/GB98/00337
§ 371 Date: May 16, 1998
§ 102(e) Date: May 16, 1998  PCT Pub. No.: W098/36391
PCT Pub. Date: Aug. 20, 1998
 Foreign Application Priority Data
Feb. 17, 1997 [GB] United Kingdom 97301006
 Int. CI. I HUM 11/00
 U.S. CI 379/102.04; 379/90.01;
379/106.01; 340/531; 340/825.36
 Field of Search 379/39, 40, 44,
379/45, 49-51, 106.01, 102.01-102.04, 142, 93.02, 90.01, 110.01; 340/531, 533, 534, 538, 568, 687, 825.32, 825.36, 825.16,
 References Cited
U.S. PATENT DOCUMENTS
4,942,599 7/1990 Gordon et al. .
5,021,779 6/1991 Bisak .
Primary Examiner—-Wing F. Chan
Attorney, Agent, or Firm—Nixon & Vanderhye PC.
A security system includes a service platform attached to a telephone network and accessible through the network. The platform is responsive to calling line identity signals (CLI) provided by the network operator to identify individual telephone lines from which calls originate and in response thereto to transmit a data list identifying protected apparatus at customer premises and release codes therefor. A home control center is responsive to signals received over a mains electricity line from protected apparatus to transmit to the apparatus a release code, the apparatus including a security module responsive to receipt of the respective release code to supply power to operational circuits of the apparatus. If a valid release code is not received from the home control center on request from the apparatus then power is denied to the apparatus. The service platform supplies a house code and a specific apparatus code and location code to the home control center for transmission to a protected apparatus on first connection of mains power thereto. Subsequent to the security protection being provided, the apparatus will only operate when connected in its home environment until such time as a blanking message is received from the service platform.
28 Claims, 17 Drawing Sheets