Patents
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Patents for H04Q 3 - Selecting arrangements (38,975)
04/1983
04/20/1983EP0077292A1 Communication network using monomode fibres as transmission means of optical channels multiplexed in lightcarrier frequency domain
04/19/1983CA1145057A1 High voltage solid-state switch
04/19/1983CA1145021A1 Arrangement of interactive telephone switching processors for performing timing analyses of port events
04/19/1983CA1145020A1 Arrangement of interactive processors for sensing or transmitting supervisory events
04/19/1983CA1145019A1 Arrangement of interactive telephone switching processors for control of ports
04/14/1983WO1983001355A1 Detector circuit for communication lines
04/13/1983EP0076646A1 Calling line tracing system and identification detector
04/12/1983CA1144671A1 Central office interface circuit
04/12/1983CA1144628A1 Filtering of port data in a switching system employing interactive processors
04/06/1983EP0075914A1 Subscriber line circuit comprising a controllable DC/DC converter as a battery feed circuit
04/06/1983EP0075652A1 Information display circuitry for a telephone set, an operator's desk or an operator's apparatus
03/1983
03/31/1983WO1983001162A1 Electronic terminator circuit
03/30/1983EP0075305A2 Composite concentration system
03/22/1983CA1143493A1 Connecting circuit for a telephone line
03/22/1983CA1143491A1 Current detection circuit arrangement for an automatic telephone exchange
03/17/1983WO1983000959A1 Telephone line circuit
03/16/1983EP0073920A2 Multi-stage switching network
03/16/1983EP0073917A1 System for rearranging paths in a blocking switching network
03/15/1983US4376875 Keyless and indicatorless local telephone switching system
03/09/1983EP0073462A2 Subscriber line circuit
03/03/1983WO1983000790A1 Wideband switching architecture
03/01/1983CA1142249A1 Arrangement of interactive telephone switching processors and associated port data storage means
02/1983
02/22/1983CA1141849A1 System and method of through signalling in a digital community office telephone exchange
02/17/1983WO1983000592A1 Semiconductor crosspoint linearizing arrangement
02/16/1983EP0035546A4 Peripheral unit controller.
02/15/1983CA1141454A1 Device for increasing the parallel inductance of a transformer
02/09/1983EP0071263A1 Method for the exchange of various information between a telecommunication exchange, in particular a telephone exchange, and a peripheral device
02/01/1983US4371797 Circuit for decreasing the effect of parasitic capacitances in field effect transistors used in coupling networks
02/01/1983US4371758 Defective short holding-time trunk identifying method
02/01/1983US4371754 Automatic fault recovery system for a multiple processor telecommunications switching control
01/1983
01/26/1983EP0070502A1 Circuit for centrally controlled telecommunication exchanges, in particular TDM telephone exchanges, with exchange of information between partly centralized installations
01/18/1983US4369371 Broadband high speed optoelectronic semiconductor switch
01/18/1983US4369337 Central office interface circuit
01/04/1983CA1138967A1 Integrated automatic call distribution facility and pbx system
12/1982
12/29/1982EP0067839A1 Voltage controlled transient protection unit.
12/28/1982US4366535 Modular signal-processing system
12/28/1982US4366347 Apparatus for selecting terminal equipment in telephone lines
12/28/1982US4365863 Optical switch for a very large number of channels
12/22/1982EP0067519A1 Telecommunications system
12/22/1982EP0067431A2 Network with a number of optical signal transmission lines interconnectable by optical mixers
12/21/1982CA1138140A1 Transmission bridge for a telephone subscriber's line circuit
12/21/1982CA1138079A1 Device for switching signals by optical means and switching units incorporating this device
12/15/1982EP0066668A1 Method of operating a telephone system
12/15/1982EP0066576A1 A method and apparatus for transferring the same information to a plurality of subscribers.
12/14/1982US4364044 Semiconductor speech path switch
12/14/1982US4363936 Telephone network including common equipment with message information and control information circuits for connecting to stations having multifunction telephones
12/14/1982CA1137666A1 Connecting circuit for a telephone line
12/14/1982CA1137665A1 Self-adjusting hybrid network
12/08/1982EP0066011A1 Telecommunication system
12/07/1982CA1137196A1 Line concentrator
12/01/1982EP0065598A1 Improvements in telecommunication receivers
11/1982
11/30/1982US4361732 Trunk interface circuit with current compensation
11/30/1982CA1136784A1 Office line connection circuit during service interruptions in key telephone apparatus
11/30/1982CA1136742A1 Space division switching and control system for switching information modulating optical frequencies
11/23/1982US4360911 Digital signal switch system having space switch located between time switches
11/23/1982US4360809 Matrix switch and method of controlling cross point switch of a matrix switch
11/23/1982US4360709 Loop detecting circuit
11/23/1982CA1136303A1 Switching matrix employing magnetic latching reed switches with double path capability
11/17/1982EP0064751A1 Optical switching apparatus
11/16/1982US4359609 Circuit with feedback for controlling the impedance thereof
11/16/1982CA1135820A1 Digital telephone exchange for areas of low subscriber's density
11/09/1982US4358858 Optical information exchange system
11/09/1982US4358645 Loop sensing circuit for use with a subscriber loop interface circuit
10/1982
10/26/1982US4356563 Automatic digital telephone exchange
10/26/1982US4356547 Device for processing telephone signals, including a processor and a preprocessor sharing a common memory
10/26/1982US4356354 Electronic subscriber junctor
10/26/1982US4356348 Techniques for detecting a condition of response on a telephone line
10/19/1982US4355209 Programmable line circuit
10/19/1982US4355207 Telephone answering system
10/13/1982EP0062293A1 Multiprocessor control arrangement
10/12/1982US4354231 Apparatus for reducing the instruction execution time in a computer employing indirect addressing of a data memory
10/12/1982US4354062 Communication system signaling circuit
10/05/1982US4353066 Channel switching network
10/05/1982CA1133147A1 Semiconductor speech path switch
09/1982
09/28/1982US4351985 Coupling system for a telecommunication exchange installation
09/28/1982CA1132736A1 Nodal structure switching network
09/21/1982CA1132275A1 Subscriber's connecting network comprising a symmetrical power amplifier for feeding a subscriber's line
09/21/1982CA1132234A1 Distributed control digital switching system
09/21/1982CA1132233A1 Multiport digital switching element
09/15/1982EP0060006A1 Loop detector with small sensibility for longitudinal voltages
09/14/1982US4349702 Nodal switching network with binary order links
09/14/1982CA1131818A1 Current limited subscriber line feed circuit
09/14/1982CA1131817A1 Computer controlled key telephone station set
09/08/1982EP0059543A1 Parallel operation of telephone equipment on a digital loop
09/08/1982EP0059469A1 System for forwarding along a telephone connection the identities of the subscribers involved in that connection
09/07/1982US4348554 Method of providing virtual private network telephone service
09/07/1982CA1131335A1 Static, solid-state originating register compatible with an electromechanical telephone cross-bar switching system
09/07/1982CA1131334A1 Digital connection network automatic switchboard
09/07/1982CA1131333A1 Method of controlling call traffic in a communication switching system
09/07/1982CA1131332A1 Communication system tracking arrangement
08/1982
08/31/1982US4347582 Central timer unit for buffering control data in a telecommunications system
08/31/1982US4347409 Key telephone system
08/25/1982EP0058470A1 Trunk interface circuit with current compensation
08/25/1982EP0058446A1 Wideband signal distribution
08/24/1982CA1130407A1 Automatic telecommunication exchange system
08/24/1982CA1130398A1 Optoelectric cross-point switch
08/18/1982EP0057840A1 Subscriber circuit
08/17/1982US4345326 Switching network and telecommunications center comprising such a network
08/17/1982US4345273 Broad band switching system
08/17/1982US4345251 Solid state commutator switch
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