Security terminal for use with two-way interactive cable system
US4361730A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 29, 1980 |
| Grant date | Nov 30, 1982 |
| Priority date | — |
| Expiry date | Aug 29, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M11/04
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A security terminal for use with a two-way interactive cable system. The security terminal develops alarm and supervisory signals, and controls their transmission over the cable when polled by a central station. The terminal discriminates between four different types of alarm condition (burglary, fire, medical and general emergency), and transmits respective coded signals over the cable, or over a switched telephone network if cable transmission is not successful. To further insure that alarm signals are properly transmitted in the event of a cable outage, the terminal responds to a cable-sent test command from the central station by causing the dialer to dial the central station over the switched telephone network; in this way, the dialer mechanism can be tested periodically to insure that it will be operative if needed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.