Telecommunications – Use or access blocking
Patent
1987-06-02
1989-05-09
Buczinski, Stephen C.
Telecommunications
Use or access blocking
34082534, 358349, 380 23, 380 25, 380 46, 380 50, H04B 106, H04K 100, H04L 902
Patent
active
048295892
ABSTRACT:
The system relates to a system for preventing unauthorized viewing of CATV etc. wherein each terminal is provided with a terminal own address generator and an auxiliary address generator. The center station allows outputs of respective address generators to be sent thereto in conformity with a time map to compare a signal sent back from the center state with the own address and the auxiliary address of the terminal of concern. The center station confirms that there is no overlap of addresses of respective terminals to provide a receiving signal permission if an abnormal condition is not found.
Such an address overlap takes place at the time when the system is initially powered or when the pirater enters. Thus, when an overlap of addresses occurs, the address of the terminal concerned is changed. For such an address, an initial address is used as the own address, and an address based on the pseudo number is used as the address offset and the auxiliary address. Since the overlap when the system is initially powered is mainly due to the addresses attached at the time of fabrication at a factory, an address offset is added, thereby to cope with this overlap. In addition, since the overlap after the system has been powered is due to the enlargement or the invasion of the pirator, an address offset is changed or an address based on the pseudo number used to cope with such an overlap.
REFERENCES:
patent: 4578531 (1986-03-01), Everhart et al.
patent: 4599489 (1986-07-01), Cargile
patent: 4716586 (1987-12-01), Bauer
Buczinski Stephen C.
Kabushiki Kaisha Toshiba
LandOfFree
Anti-tapping system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Anti-tapping system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Anti-tapping system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-95558