Patents
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Patents for H04Q 3 - Selecting arrangements (38,975)
08/1985
08/20/1985US4536615 Key telephone equipment and associated method
08/13/1985US4535442 Digital switching network for telecommunications exchange
08/13/1985US4535202 Loop-circuit for telephone line
08/13/1985CA1191920A1 Processor interconnection system
08/07/1985EP0150183A1 Method and apparatus for providing call tracing service.
08/07/1985EP0062293B1 Multiprocessor control arrangement
08/06/1985US4534023 Plural communication channel protocol support systems
08/06/1985US4533914 Remotely controlled crossconnection system
07/1985
07/31/1985EP0150109A2 Apparatus for enhancing the use of electromechanical key telephone systems
07/30/1985US4532632 Tunable semiconductor laser
07/30/1985US4532625 Communications network status information system
07/30/1985CA1191239A1 Implied principal addressing in a call coverage arrangement
07/23/1985US4531215 Validity checking arrangement for extended memory mapping of external devices
07/23/1985US4531209 Self-routing steering network
07/17/1985EP0148395A2 Matrix broad-band coupling field
07/16/1985US4530084 Communications network with optical channels
07/16/1985US4530051 Program process execution in a distributed multiprocessor system
07/16/1985US4529841 Intercept information display for a private automatic branch exchange telephone system
07/16/1985CA1190681A1 Carrier subscriber telephone off-hook detector
07/16/1985CA1190678A1 Digital supervisory circuit for a telephone system
07/16/1985CA1190659A1 Apparatus for ccis data transfer between a cpu and a plurality of data terminal equipment
07/09/1985US4528658 Telecommunication system with a multiplicity of modular units interchanging digital messages
07/04/1985WO1985002923A1 Control for a multiprocessing system program process
07/03/1985EP0147359A2 Optical waveguide-switching matrix
07/03/1985EP0147230A2 Subscriber line interface circuit having an impedance synthesizer
07/02/1985US4527012 Communications switching system with modular switching communications peripheral and host computer
07/01/1985EP0105319A4 An optical switch and a time division optical demultiplexer using such switch.
06/1985
06/26/1985EP0146292A1 Fast circuit switching system
06/25/1985US4525830 Advanced network processor
06/25/1985US4525689 N×m stripline switch
06/25/1985CA1189399A1 Water injection system for a combustion engine
06/20/1985WO1985002737A1 Alternate paths in a self-routing packet switching network
06/20/1985WO1985002736A1 Fast circuit switching system
06/18/1985US4524440 Communications system
06/18/1985CA1189209A1 Detector circuit for communication lines
06/11/1985US4523190 Switching system
06/11/1985US4523056 Telephone including resistive array for dialing and system for using such telephone
06/11/1985CA1188754A1 Binary switching element and a selector stage, a selector and selector system comprising binary switching elements
06/11/1985CA1188738A1 Electronic telephone exchanges and optical fibre links for use therein
06/06/1985WO1985002510A1 Method for costumer definable telephone capability
06/06/1985EP0089350A4 Electronic terminator circuit.
06/05/1985EP0143766A2 An arrangement in terminal systems
06/04/1985US4521069 Optical switch
05/1985
05/28/1985US4520235 Electronic key telephone system
05/28/1985US4520234 Remote cable switching system
05/28/1985CA1187969A1 Digital loop transceiver for interfacing a digital pabx to a digital subscriber set via a subscriber line
05/23/1985WO1985002311A1 Multimode data communication system
05/22/1985EP0142332A1 Interconnection networks
05/22/1985EP0142128A1 Circuit arrangement for the drainage of overvoltages
05/22/1985EP0142065A2 Connection method for data memories, especially in a telephone exchange
05/22/1985EP0141984A2 Multiprocessor central control unit for a telephone switching system
05/21/1985US4518825 Telephone interconnect detection system
05/15/1985EP0141247A2 Multiprocessor controller, especially a multiprocessor control unit of a telephone switching unit
05/15/1985EP0141246A2 Method for the operation of a multiprocessor controller, especially for the central control unit of a telephone switching system
05/15/1985EP0141245A2 Method for the operation of a couple of memory blocks normally working in parallel
05/15/1985EP0141234A2 Switching network
05/15/1985EP0141233A2 Controller for a switching array
05/14/1985US4517412 Card-actuated telecommunication network
05/14/1985US4517409 Method for checking function states in key telephone system
05/14/1985CA1187217A1 High speed optical switch and time division optical demultiplexer
05/14/1985CA1187157A1 Data processing for a toll communications switching system
05/09/1985WO1985002083A1 Interface channel unit
05/08/1985EP0140155A2 Test device for error detection in redundant circuits, especially in the control processors of a telephone switching system
05/08/1985EP0140142A1 Switching network with inverted grouping, especially for telephone switching systems
05/07/1985US4516238 Self-routing switching network
05/07/1985US4516204 Optical passive bus control system
05/02/1985EP0139103A2 Overvoltage protection circuit for slic
05/02/1985EP0138952A1 A self-routing switching network.
05/02/1985EP0138951A1 A self routing steering network.
05/02/1985EP0138950A1 A distributed prioritized concentrator.
04/1985
04/30/1985US4514597 Control of a key telephone system using a pulse width modulated signal
04/25/1985WO1985001855A1 Plural communication channel protocol support systems
04/24/1985EP0138637A1 Switching matrix for electric microwave signals
04/23/1985CA1186083A1 Subscriber line circuit comprising a controllable dc/dc converter as a battery feed circuit
04/23/1985CA1186041A1 Call-for-service and continuity sensor circuit
04/23/1985CA1186040A1 Wideband switch crosspoint and switching matrix
04/16/1985US4512036 Communications exchange
04/16/1985US4512016 Digital communication station signaling control
04/16/1985US4512012 Time-switch circuit
04/16/1985US4511969 Control channel interface circuit
04/16/1985US4511762 Overload detection and control system for a telecommunications exchange
04/16/1985CA1185711A1 Composite concentration system
04/16/1985CA1185687A1 Switching network for megahertz frequency signals
04/11/1985WO1985001598A1 Multi-processing stored program controlled telecommunication establishment
04/10/1985EP0136749A1 Telephone exchange comprising peripheral control domains
04/09/1985US4510597 Time division switching matrix
04/09/1985US4510351 ACD Management information system
04/03/1985EP0136077A2 Telephone line interface circuit
04/03/1985EP0135931A2 Central control unit of a switching system, in particular a telephone switching system
04/03/1985EP0054024B1 Subscriber line audio processing circuit apparatus
03/1985
03/28/1985WO1985001410A1 Duplicated time division switching system
03/27/1985EP0134886A2 Circuit arrangement for the transmission of signalling information from a public exchange to subscribers of a telephone exchange, especially a private telephone exchange
03/26/1985CA1184641A1 System for forwarding along a telephone connection the identities of the subscribers involved in that connection
03/26/1985CA1184640A1 Master-slave microprocessor control circuit
03/26/1985CA1184637A1 Method and apparatus for transferring the same information to a plurality of receivers
03/20/1985EP0134229A1 Borsht/slic auto balancing technique.
03/19/1985US4506346 Programmable cartridge telephone communication system
03/19/1985CA1184281A1 Telephone switching control arrangement
03/13/1985EP0134010A1 Circuit arrangement for telecommunication installations, in particular telephone exchanges with centralized and/or partially centralized information processing control circuits
03/13/1985EP0134009A1 Circuit arrangement for telecommunication installations, in particular telephone exchanges with information processing control circuits
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