Stored program control type electronic exchange system
US4009337A · kind A · utility
101Cited by
10References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 10, 1974 |
| Grant date | Feb 22, 1977 |
| Priority date | — |
| Expiry date | Oct 10, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q3/545
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A small scale electronic telephone exchange system of stored program control type having a plurality of trunks and a central computer has been disclosed. The trunks function to process the real time operation and, therefore, the central computer does not need to operate on a real time basis. The central computer always scans the condition of the trunks and the subscriber's telephone terminals and, upon detecting the change of said condition, it analyzes said change and performs the necessary process for said change. The present exchange system provides many new services but the cost of the system is reasonable.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.