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| Number | Title | Issue Date |
| 5369400 | Method and system for hitlessly rearranging connections in a cross-connect communications network A method and system for hitlessly rearranging a communications matrix and maintaining connections of previously connected signals forms an immediate and temporary connection configuration of a predetermined input gate to a predetermined output gate throug... | 11/29/1994 |
| 4866700 | Digital switching system A digital switching system for establishing safety communications between N junctors is intended to guard against the potential danger of generalized failure which lies in the use of a central control unit and digital connection network for carrying out e... | 09/12/1989 |
| 4419753 | Network connection system An electronic exchange of the time division system type or the space division system type, employing electronic contacts, in which a U-junctor is connected to the switching network of the electronic exchange. The switching network program for controlling ... | 12/06/1983 |
| 4336423 | Device for increasing the parallel inductance of a transformer A switching network includes electronic crosspoint switches for providing electronic connection or disconnection between two voice stations. Each station is connected to the network through a line transformer. When two stations are connected to each other... | 06/22/1982 |
| 4135061 | Device for blocking a junctor of an automatic switching system The invention comes within the field of telephone equipment and relates in articular to the control of the blocking of a junctor in an automatic switching system. It comprises a first interface circuit followed by an antinoise device, an enabling circuit a... | 01/16/1979 |
| 4046966 | Conference trunk circuit for an exchange There are disclosed first and second groups of internal office trunks used for an exchange. Each internal office trunk comprises first and second terminals for connecting two subscribers' telephones through a switching matrix circuit according to a demand... | 09/06/1977 |
| 4004103 | Path-finding scheme for a multistage switching network A plurality of idle paths through a multistage switching network which are capable of establishing a connection between a particular line and a particular trunk are identified. Repeated selection of paths identified as idle, but actually out-of-service, i... | 01/18/1977 |
| 3931474 | Tone injection circuit A precise tone injection circuit for injecting tone signals to a constant current junctor circuit in a two-wire balanced circuit. The tone injection circuit includes a pair of transistors operating as constant current sources feeding the respective ones o... | 01/06/1976 |
