Time division multiplexed computerized branch exchange
US4627050A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 22, 1984 |
| Grant date | Dec 2, 1986 |
| Priority date | — |
| Expiry date | May 22, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q11/04
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An improved architecture for a computerized branch exchange particularly for a time division multiplexed bus used in the exchange. An intershelf bus includes a unidirectional source bus which receives signals from expanders and a unidirectional destination bus which transmits signals to the expanders. The expanders, through another bus, communicate with line cards which interface with telephone station sets, commercial lines, etc. A time division multiplexed controller updates distributed connection tables contained in each of the expanders and controls the flow of data onto and from the unidirectional buses. The distributed connection tables eliminate the need to broadcast addresses during each time slot. The arrangement is particularly useful in reducing blocking associated with prior art bidirectional buses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.