Patents
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Patents for H04Q 3 - Selecting arrangements (38,975)
03/1985
03/12/1985US4504702 Additional line coupling circuit to an intercom telephone set
03/12/1985CA1183931A1 Wideband switching architecture
03/06/1985EP0133703A2 Digital satellite exchange for subscriber connections
03/05/1985US4503532 Multipoint fiber optic junction terminal
03/05/1985US4503290 Automatic line supervisor for use with a call concentrator
02/1985
02/27/1985EP0133569A2 Circuit arrangement for telecommunication installations, in particular telephone exchanges with data protection by parity bits
02/27/1985EP0133568A2 Circuit arrangement for telecommunication installations, in particular telephone exchanges with memories and memory sequential control circuits individually assigned to them
02/26/1985US4502138 Synchronization system for key telephone system
02/13/1985EP0132933A2 Adaptive line hybrids
02/13/1985EP0132916A1 Communication system
02/13/1985EP0067839B1 Voltage controlled transient protection unit
02/12/1985US4499461 Circuit arrangement for centrally-controlled telecommunication exchange systems, particularly for time-division multiplex telephone exchange systems, with information exchange between PBX devices
02/12/1985US4499336 In a telephone switching office
02/12/1985CA1182548A1 Signal control system
02/06/1985EP0066576B1 A method and apparatus for transferring the same information to a plurality of subscribers
02/05/1985US4497978 Method and apparatus for preventing overloading of the central controller of a telecommunication system
01/1985
01/31/1985WO1985000494A1 Method and apparatus for providing call tracing service
01/31/1985WO1985000489A1 Method and apparatus for providing a plurality of special services
01/23/1985EP0131722A1 Opto-electronic apparatus for spatial switching
01/16/1985EP0131288A2 Arrangement for information transmission between microprocessors in a decentralized process control system, in particular for telephone installations
01/16/1985EP0131131A1 Optical spatial switching arrangement
01/09/1985EP0130529A1 Net of addressable photodetectors
01/08/1985US4493030 Plural data processor groups controlling a telecommunications exchange
01/08/1985US4492821 Subscriber connection circuit
01/01/1985US4491693 Key telephone system and method of setting operating data in the key telephone system
12/1984
12/25/1984US4490820 Reception system for key telephone system
12/25/1984US4490580 Subscriber line circuit comprising a controllable DC/DC converter as a battery feed circuit
12/18/1984US4489340 PNPN Light sensitive semiconductor switch with phototransistor connected across inner base regions
12/18/1984US4489222 Telephone line interface
12/12/1984EP0127871A1 Optical spatial switching block
12/12/1984EP0127656A1 A telephone switching arrangement.
12/11/1984US4488308 Electronic bistable three-dimensional array
12/11/1984US4488004 Providing feature transparency between a plurality of PBXs
12/06/1984WO1984004833A1 Control channel interface circuit
12/05/1984EP0127570A2 Local communication system with a star network and optical channels
12/05/1984EP0126768A1 A memory cartridge for connection to a telephone switching arrangement.
12/04/1984US4486626 Method of and system for limiting access to a group of telephone trunks
12/04/1984CA1179048A1 Interface unit for a modular telecommunication system
12/04/1984CA1179046A1 Apparatus and method for controlling a modular telecommunication system
12/04/1984CA1179043A1 Dtmf activated remote telephone line switching and testing
11/1984
11/28/1984EP0126439A2 Telecommunication network, especially a telephone network with network nodes interconnecting and network offshoots-forming trunk groups
11/28/1984EP0126121A1 Hyperedge entity-relationship data base systems
11/27/1984CA1178703A1 Optical switch
11/27/1984CA1178464A1 Matrix-type optical concentrator-distributor
11/23/1984EP0086810A4 Wideband switching architecture.
11/22/1984WO1984004644A1 Rearrangeable multiconnection switching networks
11/21/1984EP0125289A1 Time-ordered data base
11/21/1984EP0125279A1 Acd management information system.
11/20/1984US4484031 Interface circuit for a telephone system
11/13/1984US4482817 Bilateral electronic switch
11/13/1984CA1177985A1 Electronic terminator circuit
11/07/1984EP0123890A2 Method for the assignment of connection data to telephone subscriber's stations
11/06/1984US4481463 Current mirror circuit
10/1984
10/24/1984EP0122845A1 Optical fibre switching device
10/24/1984EP0122684A1 Electronic switching system
10/23/1984US4479196 Hyperedge entity-relationship data base systems
10/23/1984CA1176738A1 Microprocessor control circuit
10/23/1984CA1176706A1 Telephone line circuit
10/17/1984EP0122192A1 Spatial switching device for optical beams
10/17/1984EP0121865A2 Circuit arrangement for telecommunication installations, especially for telephone exchanges comprising information processors and devices for overload control
10/16/1984CA1176378A1 Data processing groups for telecommunications exchange control
10/16/1984CA1176359A1 Digital space division exchange
10/16/1984CA1176358A1 Automatic path rearrangement for blocking switching matrix
10/11/1984WO1984004015A1 A self-routing switching network
10/11/1984WO1984004014A1 A distributed prioritized concentrator
10/11/1984WO1984003977A1 A self routing steering network
10/10/1984EP0121239A2 Circuit arrangement for telecommunication installations, especially for telephone exchanges comprising information processors and devices for overload control
10/10/1984EP0121238A2 Circuit arrangement for telecommunication installations, especially for telephone exchanges comprising information processors and devices for overload control
10/10/1984EP0121237A2 Circuit arrangement for telecommunication installations, especially for telephone exchanges comprising information processors and devices for overload control
10/10/1984EP0121236A2 Circuit arrangement for telecommunication installations, especially for telephone exchanges comprising information processors and devices for overload control
10/09/1984CA1175964A1 Two wire voice and data subscriber loop
10/03/1984EP0120459A2 Circuit arrangement for a small PBX with a switching device with electronic switching points
10/02/1984CA1175536A1 Time division multiplex telecommunication digital switching module
10/02/1984CA1175535A1 Process for switching time-multiplexed signals transmitted on a carrier, including in particular an optical carrier, and a device embodying this process
10/02/1984CA1175269A1 Optical switching apparatus
09/1984
09/26/1984EP0119973A1 Apparatus for load regulation in computer systems
09/25/1984US4473900 Modular structure for multistage PCM switching network
09/25/1984CA1175115A1 Solid state optically coupled electrical power switch
09/19/1984EP0118545A1 Pulse width modulated telephone line interface
09/18/1984US4472801 Distributed prioritized concentrator
09/18/1984US4472608 Subscriber line interface circuit
09/18/1984CA1174773A1 Electronic key telephone system
09/12/1984EP0118111A2 Method of detecting the loop state of a subschriber junction line
09/11/1984CA1174343A2 Multiple services system using telephone local loop
09/04/1984US4470154 Optical communication network
09/04/1984CA1173947A1 Three stage minimum configuration conditionally non- blocking matrix
09/04/1984CA1173943A1 Semiconductor crosspoint linearizing arrangement
08/1984
08/29/1984EP0116617A1 A pulse code modulated digital automatic exchange
08/28/1984US4468765 Electronic telephone exchanges and optical fiber links for use therein
08/22/1984EP0116430A1 Digital communication station
08/22/1984EP0116386A1 Time division switching system
08/22/1984EP0116296A1 Method and device for signalling between picture phone sets at an existing telephone link
08/21/1984US4467149 Compensation method and apparatus for use with nonideal test access lines
08/21/1984CA1173182A1 Programmable line circuit
08/21/1984CA1173144A1 Switching device for optical beams and telephone exchange incorporating such a device
08/21/1984CA1173143A1 Transfer bus matrix
08/16/1984WO1984003191A1 Borsht/slic auto balancing technique
08/15/1984EP0115786A1 Communications switching system
08/14/1984US4466098 Cross channel circuit for an electronic system having two or more redundant computers
08/14/1984US4466095 Speech path control system
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