Patents
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Patents for H04Q 3 - Selecting arrangements (38,975)
08/1989
08/23/1989CN1035031A Multi-frequency signal receiver
08/22/1989US4860344 Circuit arrangement for telecommunications switching systems, particularly telephone switching systems, etc.
08/22/1989US4860334 System for detecting and locating defective crosspoint switches
08/22/1989US4860333 Error protected central control unit of a switching system and method of operation of its memory configuration
08/22/1989US4860332 Apparatus for the automatic in-circuit testing of subscriber line interface circuits and method therefor
08/22/1989US4860230 Signal recognition system
08/22/1989US4859012 Optical interconnection networks
08/16/1989CN1034837A Method of asynchronous duplex data communication between two stations relating to specific services to be performed through a common communication channel and a station for implementing the method
08/15/1989US4858120 System for regulating arrivals of customers to servers
08/15/1989US4856863 Optical fiber interconnection network including spatial light modulator
08/15/1989CA1258548A1 System and method for defining and providing telephone network services
08/10/1989WO1989007377A1 Communications network state and topology monitor
08/09/1989EP0203165A4 Queueing protocol.
08/08/1989US4856058 Office line interface circuits
08/02/1989EP0179812B1 Circuit for maintaining the dc voltage on an electrically isolated telecommunication line at a reference level
08/02/1989CN1034460A Error correction method in switch and switch provided with error correction means
08/01/1989US4853956 Communication system distributed processing message delivery system
08/01/1989US4853955 Apparatus and method for providing existing telephone switching equipment with the capability of using the SS7 protocol
08/01/1989US4853927 Method and circuit arrangement for decentralized controlled transmission rerouting
08/01/1989US4852958 Optical matrix switch having optimized crosstalk characteristics and uniform optical output intensity
07/1989
07/27/1989WO1989006893A1 Current summed optoelectronic crossbar switch
07/27/1989DE3829051A1 Terminal identification control circuit
07/26/1989EP0325327A1 Method of asynchronous duplex data communication between two stations relating to specific services to be performed through a common communication channel, and stations for carrying out the method
07/26/1989EP0325220A1 Time-switching system
07/26/1989CN1034294A User number selecting telephone exchange set with audio-response device without operator duty
07/26/1989CN1004916B Signal transmitting system of master-control telephone set
07/25/1989US4852158 Telephone system allowing hold releasing request from central office line
07/25/1989US4852156 Private telephone system using a personal code number to access the telephone nearest to the code number holder
07/25/1989US4852149 Automated call filter
07/25/1989CA1257924A1 Optical switch circuit
07/19/1989EP0324362A1 Optical distributor of the NxN type
07/19/1989EP0324058A1 Key telephone system
07/18/1989US4850012 Automated access facilities for use with key telephone systems
07/18/1989US4850011 Key telephone system providing selection of key or PBX operational modes
07/18/1989US4850007 Telephone toll service with advertising
07/18/1989US4849964 Multistage switching system for switching N1 input channels to N2 output channels
07/13/1989WO1989006473A1 Distributed crossbar switch
07/12/1989EP0323578A2 Crosspoint switching array
07/12/1989CN1033916A Digital key telephone system
07/11/1989US4847890 Anonymous interactive telephone system
07/11/1989US4847830 Method and apparatus for automatic loading of a data set in a node of a communication network
07/11/1989US4847806 Method and apparatus for giving identity to, and selecting one of a plurality of function units
07/11/1989US4847612 Programmable logic device
07/11/1989CA1257419A1 Network event identifiers
07/06/1989DE3743401A1 Circuit arrangement for telecommunication switching systems, particularly telephone switching systems, with facilities for acquiring switching events arriving in a sequence
07/05/1989EP0323075A2 An optical switch
07/05/1989EP0323000A2 An optical backplane
07/04/1989US4845739 Telephonic-interface statistical analysis system
07/04/1989US4845736 Cross-connect switch and method for providing test access thereto
07/04/1989US4845702 Optical telecommunication package switching system using asynchronous techniques
06/1989
06/29/1989WO1989006084A1 An error correction method in a switch and a switch provided with error correction means
06/29/1989WO1989006076A1 Automated access facilities for use with key telephone systems
06/29/1989DE3841952A1 PBXs (Private branch exchanges) linked to one another via a tie line
06/27/1989US4842368 N×N single-mode optical waveguide coupler
06/27/1989CA1256615A1 Personal computer - as an interface between a telephone station set and a business communication system
06/27/1989CA1256605A1 Optoelectronic compound switching matrix
06/27/1989CA1256540A1 Methods of establishing and terminating connections in a distributed-control communications system
06/22/1989DE3820315C1 Method for two-way interchange of data between a communications switching system and a staff time recording system
06/21/1989EP0321426A1 An error correction method in a switch and a switch provided with error correction means
06/21/1989EP0233892A4 A telephone line switch.
06/20/1989US4841565 Monolithically integratable telephone circuit for feeding a subscriber's telephone line
06/20/1989US4841522 Time division channel switching circuit
06/15/1989WO1989005552A1 Routing of network traffic
06/15/1989WO1989005551A1 Method and apparatus for automatic loading of a data set in a node of a communication network
06/13/1989US4839643 Broadband signal switching equipment
06/13/1989US4838637 Integrated solid state non-volatile fiber optic switchboard
06/07/1989EP0319356A2 Matrix switch
06/07/1989CN1033341A Private automatic branch exchange
06/07/1989CN1033327A Robust, collateral messaging and recovery system and method within a digital switch
06/06/1989US4837855 Non-blocking optical space switch
06/06/1989US4837816 Communication system using switching apparatus
06/06/1989US4837808 Circuit connecting a voice-controlled device to a telephone station and line
06/06/1989US4837804 Telephone answering voiceprint discriminating and switching apparatus
06/06/1989CA1255369A1 Two wire bidirectional digital transmission system
06/01/1989WO1989005085A1 Switched optical network
06/01/1989WO1989003566A3 Layered network
05/1989
05/31/1989EP0317852A2 Remote cable pair cross-connect system
05/31/1989EP0317600A1 Integrated solid state non-volatile fiber optic switchboard
05/31/1989EP0203147B1 Automatic redialing arrangement for multi-line telephone station sets
05/30/1989CA1255026A1 Dc control circuit
05/30/1989CA1254980A1 Customer programmable real-time system
05/30/1989CA1254978A1 Digital communication network architecture for providing universal information services
05/30/1989CA1254948A1 Wideband switching system
05/24/1989EP0317352A1 Switched optical network
05/24/1989EP0317059A2 Private automatic branch exchanges
05/24/1989CN1004323B Telecommunication system, in particular telephone system
05/23/1989US4833708 Remote cable pair cross-connect system
05/23/1989US4833669 Circuitry for connecting multistage coupling fields and intermediate lines
05/23/1989US4833468 Layered network
05/23/1989US4832434 Network comprising a multitude of optical signal transmission lines connectible to one another via optical mixers
05/23/1989CA1254641A1 Nonblocking self-routing packet and circuit switching network
05/23/1989CA1254640A1 Switching system having multiple parallel switching networks
05/23/1989CA1254638A1 Reconfigurable high-speed integrated local network
05/16/1989US4831649 Method of routing calls for a network of digital time-switched exchanges
05/16/1989US4830444 Optical switch
05/11/1989DE3736897A1 Circuit arrangement for telecommunication switching systems, particularly telephone switching systems, with facilities for detecting individual switching events arriving in a sequence
05/10/1989EP0315550A2 Highly parallel computer architecture employing crossbar switch with selectable pipeline delay
05/10/1989EP0315512A1 Optical dynamic interconnection device for integrated circuits
05/09/1989US4829567 Line interface circuit
05/09/1989US4829511 Switched network of optical buses
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