Inter-network connecting system
US5185741A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 30, 1991 |
| Grant date | Feb 9, 1993 |
| Priority date | — |
| Expiry date | Jan 30, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q11/0471
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An inter-network connecting system comprising a main network having an exchange function and a subnetwork having no exchange function, to improve the expandability, economy, and efficiency of the subnetwork. When an extension line communication which is a communication in the subnetwork is to be carried out, a call setting processing processor in the main network gives a calling terminal a first special signal so as to operate lookback means in a connection control unit in the subnetwork to set a physical communication paths for an extension line between terminals in the subnetwork; and when an outer line communication which is a communication between the main network and a terminal in the subnetwork is to be carried out, the call setting processing processor gives a calling terminal a second signal so as to stop the operation of the loopback means in the connection control unit to set a physical communication path for an outer line between the exchange and the terminal in the subnetwork.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.