Stored program power control system for improving energy efficiency for telephone sets connected into a local telephone communications system
US4539437A · kind A · utility
10Cited by
14References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 30, 1982 |
| Grant date | Sep 3, 1985 |
| Priority date | — |
| Expiry date | Nov 30, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02D30/70
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A stored program energy control system operates with the control of a telephone communications system to improve its energy efficiency by removing power from station sets and their associated visual indicators when they are inactive. Inactive station sets are identified by establishing minimal intervals of nonuse to define the inactive status. The energy control system responds to events like incoming calls and switchhook activity to restore power to the station set. Since energy is applied to a station set only when precisely needed, the overall energy drain of the system is greatly reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.