Patents
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Patents for H04Q 3 - Selecting arrangements (38,975)
07/1980
07/08/1980US4211895 Electronic telephone system with time division multiplexed signalling
07/01/1980US4210782 Distributed control type telephone switching system
07/01/1980CA1080869A1 Electronic hybrid and hybrid repeater
07/01/1980CA1080867A1 Right-of-way control circuit for key telephone intercommunication system
06/1980
06/24/1980CA1080318A1 Communication bus coupler
06/24/1980CA1080317A1 Device for the control of data flows
06/17/1980US4208552 Malfunction-detecting equipment for real-time supervision of central-office circuits in telecommunication system
06/17/1980US4208551 Telephone line bank auxiliary line switching circuit
06/17/1980CA1079882A1 Pulse counting circuit for key telephone system
06/17/1980CA1079881A1 Key telephone lamp control circuit
06/17/1980CA1079880A1 Key telephone system signal priority arrangement
06/11/1980EP0011720A1 Circuitry for suppressing the influence of interfering voltages at the evaluation of the condition of a signal on transmission lines, particularly on subscriber lines in telephone installations
06/10/1980US4207438 Rotary selector adapted to scan a line multiple in a step-by-step telephone exchange
06/10/1980US4207437 Processor controlled telecommunication switching system
06/10/1980CA1079430A1 Telecommunication line switching circuit
06/10/1980CA1079428A1 Logic control for electronic key telephone line circuit
06/10/1980CA1079388A1 Method and trunk line network between units
05/1980
05/28/1980EP0011153A1 Method for the transmission of information between devices of an indirectly controlled switching system, in particular a telephone switching system
05/20/1980US4204241 Low power consumption relay switching circuit for use in conjunction with a line test trunk interfacing to a test desk
05/20/1980US4204093 Variable frame rate technique for use in a time-division multiple access (TDMA) communication system
05/20/1980CA1078050A1 Multi-stage switching network in a telecommunication switching system
05/20/1980CA1078048A1 Method of and arrangement for switching a service information
05/20/1980CA1078028A1 Circuit arrangement for producing high current pulses
05/15/1980WO1980001028A1 Signal switching device through optical means and self switches comprising such device
05/14/1980EP0010720A1 Fully electronic loop closure circuit
05/14/1980EP0010570A2 Method and device for self-adaptive load association in a data processing system
05/13/1980US4203011 Computer controlled key telephone station set
05/13/1980US4203009 Unbalanced/balanced converter circuits
05/13/1980CA1077601A1 Arrangement for automatically generating alternate telephone station identification codes
05/13/1980CA1077593A1 Multiprocessor system with computer poller and memory poller
05/06/1980US4201891 Expandable digital switching network
05/06/1980US4201890 Multiport digital switching element
05/06/1980US4201889 Distributed control digital switching system
05/06/1980US4201885 Routinable clock circuit
05/06/1980CA1077160A1 Arrangement for monitoring live call disposition signals
04/1980
04/29/1980CA1076725A1 Attendant console control system
04/22/1980US4199665 Method and arrangement for controlling traffic over two-way trunks
04/22/1980US4199664 Telephone line circuit
04/22/1980CA1076278A1 Peak shut-off electronic switch
04/16/1980EP0009684A1 A telephone-switching system
04/15/1980CA1075798A1 Multiprocessor control of a partitioned switching network by control communication through the network
04/08/1980US4197428 Segmented matrix type switching device with simplified control
04/08/1980US4197427 Dual-processor line concentrator switching system
04/08/1980CA1075351A1 Switching network with crosstalk elimination capability
04/02/1980EP0009124A1 Arrangement for subscriber circuits of digital time multiplex telecommunication systems, in particular of local PCM telephone exchanges
04/02/1980EP0009051A1 Telephone system with a plurality of internal extensions and a plurality of outside lines
04/01/1980CA1074935A1 Subscriber equipment for telephone exchange
04/01/1980CA1074895A1 Telecommunication switching system
04/01/1980CA1074893A1 Switching network with crosstalk elimination capability
03/1980
03/18/1980US4194090 Decentralized-control type electronic switching system
03/18/1980CA1074033A1 Resistive battery feed for line circuits
03/11/1980US4192975 Supply-arrangement for a line circuit
03/11/1980CA1073567A1 Space concentrator
03/11/1980CA1073546A1 Interface and dispatching system for telecommunications exchanges
03/04/1980US4191860 Data base communication call processing method
02/1980
02/26/1980US4190743 Thyristor switching matrix
02/26/1980US4189846 Process for the continuous production of solids, in particular protein concentrates, from aqueous solutions, and apparatus for the practice of the process
02/26/1980CA1072696A1 Control point circuit
02/26/1980CA1072661A1 Line connection reversing circuits
02/26/1980CA1072660A1 Private automatic branch exchange having two exchange units
02/26/1980CA1072659A1 Electronic trunk scanner
02/20/1980EP0008067A2 Indirectly controlled telecommunication system equipped with time switching stages in particular a telephone exchange system
02/20/1980EP0008066A2 Indirectly controlled telecommunication system equipped with time switching stages, in particular a telephone exchange system
02/20/1980EP0008065A1 Indirectly controlled telecommunication system equipped with time switching stages, in particular a telephone exchange system
02/12/1980US4188548 Semiconductor switching circuit
02/12/1980US4188509 Tone signalling arrangement for a telecommunications exchange
02/06/1980EP0007677A1 Circuit for the supervision of the variation of the potentials on several lines
02/05/1980US4187414 Circuit arrangement for an interference data alarm system in communication facilities, particularly in telephone equipment
02/05/1980US4187401 Method of controlling channel assignment in a time division multiplexing network
01/1980
01/29/1980US4186382 Switching network
01/29/1980US4186278 End-of-keying control circuit
01/29/1980CA1070805A1 Speech path apparatus including packaging units with respective shift register controllers
01/22/1980CA1070415A1 Relay switch
01/15/1980CA1070005A1 Special automatic trunk testing arrangement
01/09/1980EP0006816A1 Nodal structure switching network
01/09/1980EP0006622A2 Circuit for selectively through-connecting or blocking broad-band signals
01/09/1980EP0006584A1 Method for supplying a call and line current without inductances, relay contacts or transformers
01/09/1980EP0006583A1 Method for supplying a call and line current without inductances, relay contacts or transformers
01/09/1980EP0006214A1 Time division connexion network and means for mitigating the effects of failures
01/09/1980EP0006145A1 Circuit arrangement for a telecommunication exchange with microprocessors
01/08/1980US4182936 Transformerless trunk circuit
01/08/1980CA1069632A1 Telephone line battery boost circuit
01/08/1980CA1069607A1 Time division multiplexed pabx communication switching system
12/1979
12/25/1979US4180801 System for supervising connection points
12/13/1979WO1979001093A1 Method of simplifying line selection in a telecommunication exchange in which the lines can be seized from this exchange as well as from a remote exchange
12/13/1979WO1979001089A1 Multiple frame rate technique for a tdma communication system
12/12/1979EP0005842A1 High speed central office scanner
12/11/1979US4178485 Transformerless telephone line circuit
12/11/1979CA1068022A1 Automated coin arrangement providing interference free coin deposit detection during announcements
12/11/1979CA1067987A1 Apparatus for rearrangement of a switching network
11/1979
11/28/1979EP0005687A1 Method of simplifying line selection in a telecommunication exchange in which the lines can be seized from this exchange as well as from a remote exchange
11/28/1979EP0005503A1 Nodal switching network with binary order links
11/27/1979US4176256 Circuit arrangement for time-dependent monitoring of the state of lines
11/20/1979US4175216 Intercom calling apparatus in a key telephone system
11/20/1979CA1066794A1 Telephone concentrator
11/06/1979CA1065977A1 Switching network for a pcm tdm system
10/1979
10/31/1979EP0005114A1 Spatial switching and controlling system of an optical switching network
10/31/1979EP0005045A1 Data-pulse communication system and adapter
10/30/1979CA1065515A1 Electromagnetic coordinate selection device
10/30/1979CA1065455A1 Private automatic branch exchange system and apparatus
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