Computer controlled key telephone station set
US4203011A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 17, 1978 |
| Grant date | May 13, 1980 |
| Priority date | — |
| Expiry date | Jan 17, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M9/007
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A key telephone set is disclosed having a programmed digital computer which signals a central switching and control unit of a key telephone system of the status of a plurality of function switches and receives signals from the central switching and control unit that certain electrical connections and visual indicators in the key telephone set are to be initiated or controlled. Two independent audio communication circuits are provided in the key telephone set for interconnection to either the hybrid network of the handset or the built in speakerphone unit. Central office lines are accessed via individual function switches. Intercom calls are initiated via one function switch, and are answered hands-free via the speakerphone or are answered via the hybrid network. A wide range of features are signalled via the function switches and are visually monitored by means of visual indicators. The key telephone set may be used interchangeably with either dial pulse signalling units or tone signalling units.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.