Patents
Sitemap › H04 - Electric communication technique › H04Q - Selecting › H04Q 3 - Selecting arrangements
Patents for H04Q 3 - Selecting arrangements (38,975)
01/1991
01/23/1991EP0408797A1 Coupling device for broadband signals
01/23/1991EP0235231B1 Subscriber line card arrangement
01/23/1991CN1048778A Automatic wireless signal-relay station
01/22/1991US4987587 Method and apparatus for providing 800 number service
01/22/1991US4987536 Communication system for sending an identical routing tree to all connected nodes to establish a shortest route and transmitting messages thereafter
01/22/1991CA1279415C Telephone line carrier system
01/22/1991CA1279393C Digital signal processing system
01/21/1991CA2021468A1 Broadband signal switching network
01/16/1991EP0408530A2 Subscriber's line concentrator
01/16/1991EP0408024A2 Universal ISDN subscriber line connection group
01/15/1991US4985892 Baseband local area network using ordinary telephone wiring
01/10/1991WO1991000664A1 Personal communication system
01/09/1991EP0407048A2 A dual channel A/D and D/A converter
01/08/1991US4984266 Subscriber line card arrangement
01/08/1991US4984234 Time-division switching system
01/08/1991US4983961 Three stage non-blocking switching array
01/03/1991DE3921637A1 Telephone exchange system for mobile units - uses stored information relating to positions of mobile units to establish required calls
01/03/1991DE3921629A1 Telephone exchange circuitry with parallel coupling bays - uses back-up path provided by different bay for each established connection
01/02/1991EP0406191A1 Method of througconnecting wideband connections in a digital time switch module between subscribers and a device for carrying out the method
01/02/1991EP0405974A2 Holographic operating optical apparatus
01/02/1991EP0405830A2 Fully shared communications network
01/02/1991EP0405829A2 Object oriented software system architecture
01/02/1991EP0405042A1 High speed digital packet switching system
01/02/1991CN1048296A Full-duplex non-centric multichannel common type movable communication network
01/02/1991CN1011110B Emergency d.c. power supply with emergency state being indicated by polarity reversal
01/01/1991US4982422 Terminating circuit in a battery feed circuit of an electronic exchange system
01/01/1991US4982421 Virtual private line service
01/01/1991US4982187 Low-end high-performance switch subsystem architecture
12/1990
12/29/1990CA2020095A1 Holographic operating optical apparatus
12/27/1990WO1991000678A1 Method of throughconnecting wideband connections in a digital time switch module between subscribers, and a device for carrying out the method
12/27/1990CA1278206C Optical switch structure
12/25/1990US4980907 Telecommunication combination comprising a telepoint and a portable radio terminal
12/19/1990EP0403451A1 A method and arrangement for detecting and localizing errors or faults in a multi-plane unit incorporated in a digital time switch
12/19/1990EP0402853A2 Private branch exchange system with attendant console
12/19/1990EP0138951B1 A self routing steering network
12/18/1990US4979118 Predictive access-control and routing system for integrated services telecommunication networks
12/17/1990WO1990016132A1 A method and arrangement for detecting and localizing errors of faults in a multi-plane unit incorporated in a digital time switch
12/11/1990US4977555 Asynchronous duplex data communication for requesting services
12/11/1990CA1277791C Method and apparatus for providing personalized telephone subscriber features at remote locations
12/11/1990CA1277752C Communication system using switching apparatus
12/06/1990DE3918144A1 Determn. of call number distribution of peripheral terminals - using correlation program between central processor and multi-access memory contg. terminal position
12/05/1990EP0400959A2 Broadband information communications network system with coherent optical data transmission lines
12/05/1990EP0400911A2 Method and apparatus for restricting credit card communication calls
12/05/1990EP0400879A2 Dynamic shared facility system for private networks
12/05/1990EP0400500A2 A method and apparatus managing tasks
12/04/1990US4975944 Method of making call-wait and call-alternation in electronic private branch exchange (EPBX)
12/04/1990US4975941 Call processor for facilitating call completions
12/04/1990US4975838 Duplex data processing system with programmable bus configuration
12/04/1990CA1277402C Inter-exchange carrier access
11/1990
11/29/1990CA2017608A1 Method and apparatus for managing tasks
11/28/1990EP0399723A2 Improvement in switching system reliability
11/28/1990EP0399139A2 Method for the extension of a regular three-stage coupling field
11/28/1990EP0398987A1 Communications network state and topology monitor.
11/28/1990CN1047427A Carrier independent network services
11/27/1990US4974256 Load balancing and overload control in a distributed processing telecommunications system
11/27/1990US4973956 Crossbar switch with distributed memory
11/27/1990CA1277041C Switching system control arrangements
11/27/1990CA1277016C Communications system having voice and digital data capability and employing a plurality of voice and data buses in main service unit and serial packetized transmission to and from telephones
11/22/1990EP0398626A2 Telephone call forwarding device
11/22/1990EP0398614A1 Data communications network
11/22/1990EP0398543A1 Concurrent multi-stage network control method
11/22/1990EP0398183A2 Carrier independent network services
11/21/1990CN1010542B Multi-frequency signal receiver
11/20/1990US4972464 System for placement of a long distance telephone carrier point-of-presence and call routing
11/20/1990US4972453 Autonomous expert system for directly maintaining remote telephone switching systems
11/20/1990US4972452 Digital bypass for telephone system
11/20/1990CA1276692C2 Monolithic switch
11/16/1990CA2012804A1 Telephone call forwarding device
11/15/1990WO1990013982A1 Programmable logic device with ganged output pins
11/15/1990DE3915486A1 Digital fibre optic telephone and data network - uses high capacity fibre optic, microwave and short wave links with parallel standby facilities
11/14/1990EP0397372A1 Network topology for reduced blocking and photonic system implementation thereof
11/14/1990EP0397371A1 Network control arrangement based on topological equivalence
11/14/1990EP0397370A2 Network control arrangement for processing a plurality of connection requests
11/14/1990EP0397369A2 Optical apparatus for combining light beam arrays having different wavelengths
11/14/1990EP0397368A1 Method of controlling a space-division switching network
11/14/1990EP0397093A1 Broadband space switch using path sensitizing
11/14/1990EP0396816A2 Multi-stage switching network
11/14/1990EP0396589A1 Method and apparatus for automatic loading of a data set in a node of a communication network.
11/13/1990US4970723 Communications system
11/13/1990US4970507 Broadband switching matrix for delay equalization and elimination of inversion
11/13/1990US4970505 Three stage switching apparatus
11/09/1990CA2015808A1 Broadband space switch using path sensitizing
11/07/1990EP0396241A2 Cross connect frame
11/07/1990EP0396119A1 Broadband switch using deactivated crosspoints for establishing switching paths
11/06/1990US4968977 Modular crossbar interconnection metwork for data transactions between system units in a multi-processor system
11/04/1990CA2015809A1 Broadband switch using deactivated crosspoints for establishing switching paths
10/1990
10/31/1990EP0394575A1 Programmable logic device
10/31/1990EP0394477A1 Method of matching modem mode by pbx inward dialling
10/31/1990CN1046645A 线路接口电路 Line Interface Circuit
10/30/1990US4967408 Telephone exchange including service feature apparatus
10/25/1990DE3913071A1 Telephone private branch exchange with conference facility - has amplifiers inserted between corresponding column lines of different coupling matrices
10/24/1990EP0393822A2 Line interface circuit
10/24/1990EP0393126A1 Routing of network traffic.
10/24/1990CN1046432A Improvement in or relating to exchanges
10/23/1990US4965721 Firmware state apparatus for controlling sequencing of processing including test operation in multiple data lines of communication
10/23/1990CA1275482C Station number portability
10/18/1990WO1990012465A1 High speed data packet switching circuit and method
10/17/1990EP0392724A2 Resource allocation arrangement
10/16/1990US4964156 Cellular telephone unit capable of automatic interaction with audio services
10/16/1990US4963863 Broadband signal switching equipment
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