| Patents for H04Q 3 - Selecting arrangements (38,975) |
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| 04/05/1990 | WO1990003702A1 Method of matching modem mode by pbx inward dialling |
| 04/04/1990 | EP0361760A2 ISDN, basic rate interface arranged for quad voice |
| 04/04/1990 | EP0361649A2 Method of multicast message distribution |
| 04/04/1990 | EP0361607A1 Fully integrated telecommunication network |
| 04/04/1990 | EP0360898A1 Method for taking calls which are signalled by a communication exchange at one or more key telephone terminals |
| 04/03/1990 | US4914690 Universal PBX interface |
| 04/03/1990 | US4914689 Reverse automatic number identification system |
| 04/03/1990 | US4914572 Method for operating an error protected multiprocessor central control unit in a switching system |
| 04/03/1990 | US4914430 Rearrangeable multiconnection switching networks constructed using combinatorial designs |
| 04/03/1990 | US4914429 Switch components and multiple data rate non-blocking switch network utilizing the same |
| 04/03/1990 | US4913509 Fail-safe port for use with an optical fiber |
| 03/28/1990 | EP0360726A2 Communications network routing and management system |
| 03/28/1990 | EP0360493A2 More efficient call handling for operator assistance calls |
| 03/28/1990 | EP0360227A2 Terminating circuit in a battery feed circuit of an electronic exchange system |
| 03/27/1990 | US4912706 Frame synchronization in a network of time multiplexed optical space switches |
| 03/27/1990 | US4912705 Subscriber RF telephone system for providing multiple speech and/or data signals simultaneously over either a single or a plurality of RF channels |
| 03/27/1990 | US4912698 Multi-processor central control unit of a telephone exchange system and its operation |
| 03/27/1990 | CA1267233A1 Method and circuit arrangement for the transmission of data signals between control devices connected to one another via a loop system |
| 03/27/1990 | CA1267232A1 Method and circuit arrangement for the transmission of data signals between control devices connected to one another via a loop system |
| 03/27/1990 | CA1267231A1 Method and circuit arrangement for the transmission of data signals between two control devices belonging to a loop system |
| 03/27/1990 | CA1267226A1 Fault recovery in a distributed processing system |
| 03/21/1990 | EP0359723A2 Arrangement in equipment for the reproduction of voice message in telephone line |
| 03/21/1990 | CN1007315B Communication system with remote-controlled signal receiving apparatus |
| 03/20/1990 | US4910766 Quasi reservation-based communication service process system |
| 03/20/1990 | US4910730 Batcher-banyan network |
| 03/20/1990 | US4910396 Optical shutter switching matrix |
| 03/20/1990 | CA1266920A1 Method and circuit arrangement for the transmission of data signals between two control devices belonging to a loop system |
| 03/14/1990 | EP0358408A2 Intelligent network |
| 03/14/1990 | CN1007203B Wide band signal space coupling arrange ments |
| 03/13/1990 | US4908856 Switching voltage regulator for an interface circuit in a telephone subscriber line |
| 03/13/1990 | US4908850 Voice services network with automated billing |
| 03/13/1990 | US4908824 Communications system comprising a ring-shaped network which is provided so as to provide a communications network in the subscriber line region of a digital switching equipment |
| 03/13/1990 | CA1266716A1 Switching array with concurrent marking capability |
| 03/07/1990 | EP0125279B1 Acd management information system |
| 03/06/1990 | US4907262 Method of transmitting dual tone multi-frequency during communication in a private branch exchange using keyphones |
| 03/06/1990 | US4907256 Exchange system having originating call restriction function |
| 03/06/1990 | US4907253 Cross-connected switch having means for removing switching modules without interrupting service |
| 03/06/1990 | US4906833 Electron beam information exchange apparatus with converting light signals |
| 03/06/1990 | US4906064 Switch for selectively switching optical wavelengths |
| 02/28/1990 | EP0355714A2 Method and apparatus for initiating communication services |
| 02/28/1990 | EP0355488A2 Method for realizing a control procedure in combination with the realisation of a hold state of a line in a calculator-controlled communication system, especially a key telephone system |
| 02/28/1990 | EP0355487A2 Method for the realization of conference connexions in a computer-controlled communication system, especially a key telephone system |
| 02/28/1990 | EP0127656B1 A telephone switching arrangement |
| 02/28/1990 | CN1040120A Total data communication exchange system |
| 02/27/1990 | US4905233 Multiple path routing mechanism for packet communications network |
| 02/27/1990 | US4905227 Circuit for subscriber line interface circuits in a digital time-division multiplex communication switching center |
| 02/22/1990 | DE3827099A1 Method for building up a switching network |
| 02/14/1990 | EP0354702A2 Image communication apparatus |
| 02/14/1990 | EP0354254A1 Coupling device for broad-band signals |
| 02/14/1990 | EP0354253A1 Coupling device for broad-band signals |
| 02/14/1990 | EP0354252A1 Coupling device for broad-band signals |
| 02/14/1990 | CN1039667A Multi-link chip |
| 02/13/1990 | US4901305 Distributed crossbar switch |
| 02/13/1990 | CA1265879A1 Data framing system for time division multiplexing transmission |
| 02/08/1990 | WO1990001246A1 Process for the acquisition of data concerning a digital transmission network |
| 02/08/1990 | WO1990001237A1 Adaptive routing of network traffic |
| 02/07/1990 | EP0353871A1 Binary tree switching network |
| 02/07/1990 | EP0353739A2 Telephone-call distributor |
| 02/07/1990 | EP0353615A2 Method for updating system configuration data and individual user data in a switching exchange |
| 02/07/1990 | CN1039516A Method and apparatus for through-connecting wideband connection in digital time switch |
| 02/07/1990 | CN1006752B Speakerphone sensing circuit |
| 02/06/1990 | US4899375 More efficient call handling for operator assistance calls |
| 02/06/1990 | US4899374 Method for a program-controlled telephone switching system in which performance features relating to the setup of a call connection can be initiated from a subscriber station |
| 02/06/1990 | US4899373 Method and apparatus for providing personalized telephone subscriber features at remote locations |
| 02/06/1990 | US4899336 Centrally controlled telecommunications exchange system |
| 02/01/1990 | DE3826025A1 Method for exchanging data between an access control system and a communication switching system |
| 01/31/1990 | EP0352735A2 Method for realizing a service-specific command procedure in a calculator-controlled communication system, especially a key telephone system, with the posibility of breaking-in |
| 01/31/1990 | EP0352701A2 Method for realizing a service-specific command procedure in a calculator-controlled communication system, especially a key telephone system, with the possibility of breaking-in |
| 01/31/1990 | EP0352700A2 Method for realizing a service-specific command procedure in a calculator-controlled communication system, especially a key telephone system, with the possibility of breaking-in |
| 01/31/1990 | CN1039339A Communication switching element |
| 01/30/1990 | US4897866 Telecommunication system with subscriber controlled feature modification |
| 01/30/1990 | US4897645 Broadband signal switching equipment |
| 01/30/1990 | US4897641 Space switch |
| 01/30/1990 | US4896934 Broadband optical multicast switch |
| 01/30/1990 | CA1265227A1 Method for monitoring and controlling the traffic in digital transmission networks |
| 01/25/1990 | WO1990000850A1 Method and apparatus for through-connecting a wideband connection in a digital time switch |
| 01/25/1990 | WO1990000757A1 Binary tree switching network |
| 01/24/1990 | EP0352040A2 Apparatus for the automatic in-circuit testing of subscriber line interface circuits and method therefor |
| 01/24/1990 | EP0351959A2 Multi-channel controller |
| 01/24/1990 | EP0351729A2 Optical switching system |
| 01/23/1990 | US4896350 Arrangement for providing a call-connection service |
| 01/23/1990 | US4896346 Password controlled switching system |
| 01/17/1990 | EP0351386A1 Method and apparatus for through-connecting a widebandconnection in a digital time switch |
| 01/17/1990 | EP0351161A2 Testing communications systems |
| 01/17/1990 | EP0351132A2 Optical crossover network |
| 01/17/1990 | EP0350918A2 Electronic switching system having call-forwarding function |
| 01/17/1990 | EP0350478A1 Process for operating a multiprocessor central control unit of a relay system. |
| 01/16/1990 | US4894864 Interface circuit |
| 01/16/1990 | US4894857 Method and apparatus for customer account servicing |
| 01/16/1990 | US4894651 Broadband signal switching equipment |
| 01/11/1990 | WO1990000339A1 Method of automatically editing data for controlling a processor that carries out distributed control and a system using the same |
| 01/11/1990 | DE3823236A1 Method for a program-controlled telephone switching system with a central controller which performs all switching functions |
| 01/10/1990 | EP0350402A1 Personal computer integrating a digital ISDN subscriber terminal |
| 01/10/1990 | EP0349623A1 Active communication network. |
| 01/10/1990 | EP0349597A1 Improvements in electro optical switch architectures. |
| 01/10/1990 | EP0195051B1 Trunk call processing services for host computer interconnections |
| 01/10/1990 | CN1006436B Inter-network connection system |
| 01/09/1990 | US4893335 Remote access telephone control system |
| 01/09/1990 | US4893330 Method and apparatus for restricting credit card communication calls |
| 01/09/1990 | US4893325 Integrated public safety answering point system |