Patents
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Patents for H04Q 3 - Selecting arrangements (38,975)
06/1990
06/27/1990EP0374881A2 Method and apparatus for starting switching system
06/27/1990EP0214179B1 Processing sequence calls in a distributed control switching system
06/27/1990EP0211890B1 Path hunting in a distributed control switching system
06/27/1990CN1043417A Telephone protection circuit
06/27/1990CN1043416A System for connecting optical lines to wideband telecommunications exchange
06/26/1990US4937851 Loop status verification system
06/26/1990US4937475 Laser programmable integrated circuit
06/21/1990DE3842879A1 Method and arrangement for storing voice data in a telephone PBX system
06/20/1990EP0373714A1 Coupling network for a data processor, comprising a series connection of at least one crossbar switch and at least one array of silos, and data processor comprising such a coupling network
06/19/1990US4935958 Busy/no-answer call completion equipment
06/19/1990US4935957 Key telephone system
06/19/1990US4935954 Automated message retrieval system
06/19/1990US4935866 Multiprocessor control system
06/19/1990US4934775 Optical space switches using cascaded coupled-waveguide optical gate arrays
06/19/1990CA1270396A1 Light-conductive circuit unit
06/14/1990WO1990006660A1 Virtual tributary cross connect switch and switch network utilizing the same
06/14/1990WO1990006659A1 Switch components and multiple data rate non-blocking switch network utilizing the same
06/14/1990WO1990006645A1 System for cross-connecting high speed digital signals
06/13/1990EP0372673A2 Telephone protection circuit
06/13/1990EP0372446A1 Device for connecting optical lines with a broadband telecommunication exchange
06/13/1990EP0372270A2 Adaptive routing control method
06/13/1990EP0216799B1 Directory number translation in a distributed control switching system
06/13/1990EP0214178B1 Controlling multi-port hunt groups in a distributed control switching system
06/13/1990EP0211891B1 Terminating port determination in a distributed control switching system using a distributed database
06/13/1990CN1043063A Self-entry relay unit of automatic exchange
06/13/1990CN1043056A Transmission networks
06/13/1990CN1043055A Digital key telephone system
06/12/1990US4933967 Automatically-effected move of a subscriber between electronic message service systems in a network
06/12/1990US4933966 Method and apparatus for performing an automated collect call
06/12/1990US4932735 Integrated optical hybrid matrix switches with very low crosstalk
06/12/1990CA1270315A1 Busy/no-answer call completion equipment
06/06/1990EP0371676A2 Communication channel reallocation
06/06/1990EP0371674A2 Communication channel reservation
06/06/1990EP0371169A1 Method for controlling the taking over of, on the one hand, switching-related tasks and, on the other hand, operational and/or protection-related tasks by a processor in the central control unit of a telecommunications switching system
06/06/1990CN1042786A Parallel microcomputer of user digital terminal with digital network of centralization service
06/05/1990US4932046 Telephone programming system for automated calling
06/05/1990US4932043 Apparatus for controlling key telephone station set in key telephone system
06/05/1990US4932042 Spontaneous voice and data messaging
06/05/1990US4931959 Optical shuffle arrangement
06/05/1990US4931941 Adaptive routing of network traffic
06/05/1990CA1270054A1 Broadband signal space switching apparatus
05/1990
05/31/1990WO1990006026A1 Universal micro circuit for telecommunication applications
05/30/1990EP0370662A2 Password controlled switching system
05/30/1990EP0370577A1 Integrated semiconductor device including an optoelectronic switch element
05/29/1990US4930154 Audible logo for identifying a common carrier
05/29/1990US4930153 PBX voice mail interface
05/29/1990US4930152 Call return telephone service
05/29/1990US4930151 Telephone call forwarding device
05/29/1990US4930150 Telephonic interface control system
05/29/1990US4929940 Collision crossbar switch
05/23/1990EP0369960A1 Universal micro circuit for telecommunication applications
05/23/1990EP0369690A2 Frame synchronization in a network of time multiplexed optical space switches
05/23/1990EP0369193A2 Collision crossbar switch
05/22/1990US4928306 Dynamically configurable telephone
05/22/1990US4928304 Electronic switching system connected to an external computer
05/22/1990US4928276 T1 line format for robbed signaling for use with CCITT 32K bit per second ADPCM clear channel transmission and 64KBPS clear channel transmission
05/22/1990US4927230 Optical switch array provided with a mask having openings of a predetermined pattern and shutters corresponding to the pattern
05/18/1990CA2003121A1 Universal micro circuit for telecommunication applications
05/16/1990EP0368501A1 Cross-connecting system
05/16/1990EP0126768B1 A memory cartridge for connection to a telephone switching arrangement
05/16/1990CN2057300U 100 line exchange for automatic telephone subscriber
05/16/1990CN1042286A Time division switch
05/16/1990CN1008047B The data processing system and its method of application
05/15/1990US4926462 Telephone system
05/15/1990US4926461 Telephone answering machine having call transfer capabilities
05/15/1990US4925264 Optical switching element comprising two parallel optical guides and switching matrix constituted by such elements
05/15/1990CA1269177A1 System for maintaining the hardware-software compatibility of modular communication systems
05/15/1990CA1269171A1 Circuit for ccis data transfer between a cpu and a plurality of terminal equipment controllers
05/15/1990CA1269156A1 Subscriber pair identification system
05/09/1990EP0367455A2 Phone management server for use with a personal computer lan
05/08/1990US4924510 Telecommunications database accessing method
05/08/1990US4924500 Carrier independent network services
05/08/1990US4924495 Enhanced communication services and apparatus
05/08/1990US4924491 Arrangement for obtaining information about abandoned calls
05/08/1990US4924480 Codecs with suppression of multiple encoding/decodings across a connection
05/08/1990US4923269 Bidirectional optical space switch
05/08/1990CA1268873A1 Line interface circuit
05/02/1990EP0366341A2 Reliable database administration arrangement
05/02/1990EP0366263A2 Time division switch
05/02/1990EP0365905A2 Process for controlling centrally controlled communication exchanges
05/01/1990US4922531 Line interface circuit
05/01/1990US4922522 Telecommunications access to lottery systems
05/01/1990US4922416 Interface device end message storing with register and interrupt service registers for directing segmented message transfer between intelligent switch and microcomputer
05/01/1990US4922246 Message merging device
05/01/1990US4922245 Rearrangeable multiconnection switching networks constructed using combinatorial designs
05/01/1990US4922244 Queueing protocol
05/01/1990CA1268532A1 Method and apparatus for providing variable reliability in a telecommunication switching system
05/01/1990CA1268531A1 Control data transmission system for private branch exchange
04/1990
04/30/1990CA2001100A1 Transmission networks
04/25/1990EP0365200A2 Telecommunication system with subscriber controlled feature modification
04/25/1990CN1007775B Pabx-networking
04/24/1990US4920529 Network control method and apparatus therefor
04/24/1990US4919512 Wavelength shift switch and sensing system
04/24/1990CA1268273A1 Telephone call processing system
04/18/1990CN1041498A Fully integrated telecommunication network
04/17/1990US4917456 Optical crossover network
04/17/1990US4917450 Dynamic optical interconnection device for integrated circuits
04/17/1990CA1267960A1 Multiple access communication system having loop- check circuitry for switching intraoffice connections
04/10/1990CA1267727A1 Interface circuit
04/10/1990CA1267711A1 Switching network
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