H04Q 3 - Selecting arrangements

Patents for H04Q 3 - Selecting arrangements (38,975)
03/1981
03/24/1981	US4258231 Remote line switching extension for telephone exchange
03/24/1981	CA1098226A1 Ringing and testing control circuitry for communication systems
03/18/1981	EP0025216A1 Signalling arrangement in a voice transmission system with optically powered modules
03/17/1981	US4257097 Multiprocessor system with demand assignable program paging stores
03/17/1981	US4257060 Semiconductor switch
03/17/1981	US4256927 Space division switching system for communication networks using optical signal frequencies
03/17/1981	US4256926 Microprocessor control complex for a telecommunication switching system
03/17/1981	CA1097785A2 Telecommunication system including non-symmetric switching network
03/17/1981	CA1097784A1 Electronic telephone system featuring periodic scanning of all peripheral units and polling of specific peripheral units for transmission of status and/or instruction information
03/17/1981	CA1097783A1 Electronic telephone switching system comprising a speech-path switching matrix and tone-connecting matrix and employing electronic crosspoint switching devices
03/17/1981	CA1097781A1 Electronic telephone system
03/10/1981	US4255619 Telephone reservation-processing system
03/03/1981	US4254305 Current limited subscriber line feed circuit
03/03/1981	CA1096981A1 Interference insensitive line supervision circuit
02/1981
02/24/1981	US4252998 Identifier for manual switchboards with conference facility
02/24/1981	CA1096522A1 Subscriber line-trunk circuit
02/24/1981	CA1096521A1 Key telephone station set circuit
02/11/1981	EP0023689A1 Logic apparatus for the preprocessing of alarm signals
02/10/1981	CA1095623A1 Money transfer device keyboard terminal
02/03/1981	CA1095182A1 Integrated semiconductor crosspoint arrangement
01/1981
01/28/1981	EP0022938A1 Device for increasing the parallel inductance of telephone line transformers
01/20/1981	US4246594 Low crosstalk type switching matrix of monolithic semiconductor device
01/20/1981	CA1094209A1 System for monitoring the operational ability of data processing equipment
01/14/1981	EP0022163A1 Circuit arrangement for a telecommunication exchange, particularly for a telephone exchange with junction circuits for different signalling methods
01/13/1981	US4245214 Switching matrix
01/13/1981	CA1093663A1 Junctor checking system
01/07/1981	EP0021932A1 Switching network and telecommunication centre comprising such a network
01/07/1981	EP0021509A1 Electronic subscriber connector
01/07/1981	EP0020878A1 Service integrated information transmission and switching system for sound, picture and data
01/07/1981	EP0020822A1 Current detector circuit
01/06/1981	CA1093195A1 Digital switching of electronic signals
01/06/1981	CA1093194A1 Communication system conferencing arrangement
12/1980
12/30/1980	CA1092721A1 Wiring substrate for a matrix circuit
12/16/1980	US4240136 Apparatus for inserting instructions in a control sequence in a stored program controlled telecommunication system
12/16/1980	CA1091834A1 Electric network for use in a subscriber's loop
12/10/1980	EP0020255A1 Switching level of an operator for a packet-switched digital data network
12/10/1980	EP0019664A2 Circuit arrangement for a telecommunication exchange with selection stages, particularly for a telephone exchange
12/09/1980	US4238644 Supply circuit for a subscriber's line circuit
12/09/1980	CA1091373A1 Signalling system for overvoltage protectors
12/09/1980	CA1091335A1 Communication system call transfer arrangement
12/02/1980	US4237545 Programmable sequential logic
12/02/1980	US4237447 Speed independent selector switch for digital communication networks
12/02/1980	CA1090928A1 Dual mode telephone subscriber loop current detector
12/02/1980	CA1090909A1 Communication system using intelligent network processor
12/02/1980	CA1090908A1 Communication system call coverage arrangements
11/1980
11/25/1980	US4236049 Electronic key telephone system
11/25/1980	CA1090497A1 Line current detection
11/25/1980	CA1090496A1 Telephone control console
11/25/1980	CA1090495A1 Subscriber line circuits using hall effect devices
11/25/1980	CA1090432A1 Crosspoint bias circuit arrangement
11/12/1980	EP0018844A1 Telephone systems
11/12/1980	EP0018754A1 Speed independent selector switch for digital communication networks
11/11/1980	US4233471 Automatic telecommunication exchange system
11/04/1980	US4232293 Line interface unit for voice and wide band signal coupling
11/04/1980	US4232234 Semiconductor switch circuit
11/04/1980	US4232199 Special services add-on for dial pulse activated telephone switching office
11/04/1980	CA1089134A1 Telephone station set interface circuit
11/04/1980	CA1089133A1 Telephone subscriber line circuit
11/04/1980	CA1089129A1 Key telephone intercom line system
10/1980
10/29/1980	EP0017764A1 Subscriber line circuit with ground key activation indication, high ohmic commutable feeding and apparatus for ringing-signal generation
10/29/1980	EP0017763A1 Subscriber line circuit with ground key activation indication and insulation fault indication
10/28/1980	US4231017 Switching matrix equipment having a series circuit of relay coil and self-holding diode at each crosspoint
10/28/1980	US4230913 Line concentrator
10/28/1980	CA1088685A1 Telephone subscriber line circuit
10/28/1980	CA1088683A1 Calling circuit
10/28/1980	CA1088656A1 Space stage in a pcm-exchange
10/21/1980	US4229624 Switching network control arrangement
10/21/1980	US4229071 Electro-optical switching apparatus
10/14/1980	US4228499 Interface unit for data exchange between a central processor and a peripheral unit in TDM telecommunication system
10/07/1980	US4227094 Switching matrix for wide band electric transmission signals
10/07/1980	CA1087298A1 Burst gate pulse generator
10/02/1980	WO1980002094A1 Communication system tracking arrangement
10/01/1980	EP0016426A1 Digital telephone exchange
10/01/1980	EP0016413A1 Circuit for determining the source of a telephone connection
10/01/1980	EP0016397A1 Indirectly controlled switching system, in particular telephone switching system
10/01/1980	EP0016396A1 Switching network with inverted grouping, especially for telephone switching systems
09/1980
09/23/1980	US4224479 Method of controlling call traffic in a communication switching system
09/23/1980	US4224478 Data transmission circuit for establishing a bidirectional data path in a telephone system
09/23/1980	US4224477 Arrangement for translating telephone station equipment numbers into directory numbers
09/23/1980	US4224475 Time division switching network
09/17/1980	EP0015524A1 Automatic switching system with digital connection network
09/16/1980	US4223380 Distributed multiprocessor communication system
09/09/1980	CA1085498A1 Multi-frequency code signaling between registers
09/09/1980	CA1085497A1 Programmable control unit for use in small and medium size switching systems, especially in telephone exchanges
09/02/1980	US4220825 Telephone status monitor circit
09/02/1980	US4220824 Interface linking synchronous sense and drive matrices of telephone system with a processor of signalization data
09/02/1980	US4220821 Off-hook initiated demand assignment communications
09/02/1980	US4220396 Fiber optic switch
08/1980
08/26/1980	US4219699 Telephone supervision system using DTMF signals
08/12/1980	CA1083734A1 Key telephone line circuit tone-on-hold arrangement
08/12/1980	CA1083733A1 Key telephone communication path interface
08/12/1980	CA1083696A1 Time division switching network
08/06/1980	EP0014152A1 Operator for a packet-switched data network
08/05/1980	US4216532 Self-correcting solid-state mass memory organized by words for a stored-program control system
08/05/1980	US4216355 Telephone line monitoring apparatus
07/1980
07/29/1980	US4215251 Switching apparatus selectively utilizing a regenerative repeater
07/29/1980	US4215246 Dial pulse signaling arrangement
07/29/1980	CA1082826A1 Called party fraud detection in an automated coin system
07/15/1980	CA1081832A1 Arrangement serving operator assistance calls requiring routing back to originating offices
07/08/1980	US4211899 Circuit arrangement for an indirectly controlled exchange, in particular a telephone exchange

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