Data distribution system for private automatic branch exchange
US4286118A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 2, 1979 |
| Grant date | Aug 25, 1981 |
| Priority date | — |
| Expiry date | Jul 2, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q3/625
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A data distribution system for a private branch telephone exchange for providing information to a plurality of PBX stations. Two embodiments (serial and parallel) including addressable stations are shown. Memory devices driving a plurality of displays at each station are updated in response to command signals from a controller preceded by the station address. Each station may communicate with the controller and transmit keyed-in signals or information reflecting station availability. A novel multiplexed LCD, switching matrix bypass upon controller failure circuit, and bus protection circuit upon remote power supply failure are also shown.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.