Digital timeslot and signaling bus in a digital PBX switch
US4975903A · kind A · utility
27Cited by
41References
28Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 21, 1989 |
| Grant date | Dec 4, 1990 |
| Priority date | — |
| Expiry date | Dec 21, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q11/0407
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A switch in a digital PBX system supporting both centralized an distributed switching techniques. The switch has nearly universal and parallel bus between line card modules. Then a timeslot bus capable of having more than one module may communicate voice PCM or data signals during one timeslot. The bus also has a signaling bus by which line card modules are selected to communicate with a central control module by a single line to maintain the universality of the bus. Signaling information is also passed between a selected line card module and the central control module by a pair of parallel lines.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.