| Patents for H04M 7 - Arrangements for interconnection between switching centres (24,777) |
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| 08/01/1989 | US4853955 Apparatus and method for providing existing telephone switching equipment with the capability of using the SS7 protocol |
| 07/25/1989 | US4852157 Multi-task state machine signalling translator |
| 06/29/1989 | DE3841952A1 PBXs (Private branch exchanges) linked to one another via a tie line |
| 06/15/1989 | WO1989005552A1 Routing of network traffic |
| 06/07/1989 | CN1033328A Conversation-screen network |
| 05/24/1989 | CN1004323B Telecommunication system, in particular telephone system |
| 05/16/1989 | US4831651 Intermediate amplifier for use in two-wire connections of a dial telephone network and method for the gain control of said amplifier |
| 05/09/1989 | US4829562 Receiver for detecting different fixed frequency signals on a telephone trunkline |
| 05/03/1989 | EP0133577B1 Data transmission system in a digital transmission network and arrangement for the use of this system |
| 05/02/1989 | CA1253599A1 Methods and apparatus for efficient resource allocation |
| 04/25/1989 | CA1253242A1 Routing of network traffic |
| 04/05/1989 | CN1032274A Secondary dialling method within acoustic frequency band |
| 04/04/1989 | US4819228 Synchronous packet voice/data communication system |
| 03/21/1989 | US4815124 DX circuit |
| 02/21/1989 | CA1250380A1 System for interfacing a standard telephone set with a radio transceiver |
| 02/14/1989 | US4805205 Method and device for establishing bidirectional communications between persons located at different geographically distant stations |
| 02/14/1989 | CA1250066A2 Integrated service digital network subscriber line |
| 02/09/1989 | DE3725315A1 Circuit arrangement for an electronic exchange line holding coil in an exchange junction circuit of a telephone private branch exchange having dialling control which emits pulses |
| 01/24/1989 | CA1249382A1 Arrangement for operating and maintaining a telecommunications system |
| 01/17/1989 | US4799256 Telecommunication signalling arrangement |
| 01/17/1989 | CA1249086A1 Three relay c.o. trunk interface |
| 01/11/1989 | EP0298750A2 Radio telephone system |
| 12/20/1988 | US4792970 Expansion port for use in a communication system |
| 12/06/1988 | US4790003 Message service system network |
| 11/29/1988 | US4788721 Routing of network traffic |
| 11/29/1988 | US4788718 Call data collection and modification of received call distribution |
| 11/29/1988 | CA1245737A1 Loop transmission system having automatic loop configuration control means |
| 11/15/1988 | CA1244923A1 Expansion port for use in a communication system |
| 11/03/1988 | WO1988008654A1 Message service system network |
| 11/02/1988 | EP0288462A1 Routing of network traffic. |
| 11/01/1988 | US4782506 Arrangement for operating and maintaining a telecommunications system |
| 11/01/1988 | CA1244166A1 Interswitch line circuit |
| 10/18/1988 | CA1243433A2 Baseband local area network using ordinary telephone wiring |
| 10/04/1988 | US4776007 Solid state trunk circuit |
| 09/13/1988 | US4771425 Synchoronous packet voice/data communication system |
| 09/13/1988 | CA1242039A1 Interface channel unit |
| 08/30/1988 | US4767980 Inductance multiplier circuit |
| 08/25/1988 | WO1988006386A1 Telephone network coupler |
| 08/23/1988 | US4766605 In a telecommunications network |
| 08/03/1988 | EP0276493A2 Method for expanding the connection capacity and line access of call-handling or information positions in telephone exchanges, especially multiple operator's position exchanges |
| 08/02/1988 | CA1240088A1 Solid state trunk circuit |
| 07/12/1988 | US4757526 Signal transfer arrangement |
| 07/05/1988 | US4756018 Multiple access communication system having loop-check circuitry for switching intraoffice connections |
| 07/05/1988 | CA1238967A1 Automatic route selection of a private telephone network path on the basis of a public telephone network number |
| 06/28/1988 | US4754480 Circuit arrangement for telecommunication switching systems connected to line concentrator sub-exchanges by connecting channels |
| 06/28/1988 | US4754455 Telephone signal transmission device |
| 06/08/1988 | CN86107679A Rapidly adjustable multiple connection device of adaptive positive / negative code |
| 05/31/1988 | US4748658 Architecture for allocating resources in a telecommunications network |
| 05/31/1988 | US4748588 Fast data synchronizer |
| 05/25/1988 | CN87205599U Second group digital branch equipment |
| 05/24/1988 | US4747099 PCM communication apparatus |
| 05/18/1988 | CN87207072U Mono-frequency pulse/digital circuit signal converter |
| 05/18/1988 | CN86107477A Non-relay circuit for the carrier's audiofrequency terminal panel |
| 05/10/1988 | US4744028 Methods and apparatus for efficient resource allocation |
| 04/13/1988 | EP0263282A2 Signalling receiver |
| 03/30/1988 | EP0161253B1 Interface channel unit |
| 03/29/1988 | US4734935 Communication system with remotely controllable signal receiving means |
| 03/22/1988 | CA1234437A1 Office line interface circuits |
| 03/15/1988 | US4731827 Interswitch line circuit |
| 03/10/1988 | DE3629938A1 Circuit arrangement with an electronic choke |
| 03/10/1988 | DE3629937A1 Circuit arrangement with an electronic choke |
| 03/08/1988 | CA1233898A1 Disconnect circuit for use between telephone switching systems |
| 03/02/1988 | CN86203191U Loop carrier wave concentrator |
| 02/23/1988 | US4727535 Telephone network coupler |
| 01/28/1988 | DE3624862A1 Circuit arrangement for an exchange circuit in a telephone branch exchange |
| 01/19/1988 | US4720850 Communication system control arrangement |
| 01/13/1988 | CN87104413A Railway basic unit service automatic communication system |
| 12/16/1987 | EP0248812A1 Method and apparatus for efficient resource allocation. |
| 12/15/1987 | CA1230390A1 Fault protection for integrated subscriber line interface circuits |
| 12/01/1987 | US4710915 Loop transmission system having automatic loop configuration control means |
| 11/11/1987 | CN86103152A Remote dialing apparatus for joining common-frequency simplex radio telephone into automatic duplex wire telephone network |
| 11/03/1987 | US4704724 Routing of network traffic |
| 10/14/1987 | EP0241228A2 Multiple access communication system having loop-check circuitry for switching intraoffice connections |
| 10/08/1987 | DE3609889A1 Circuit arrangement for telecommunications switching systems, in particular PCM telephone switching systems, with concentrators |
| 10/07/1987 | CN86209487U All-functional interface device for loop wave carrier |
| 09/08/1987 | CA1226656A1 Dial-operated pbx exchange |
| 08/25/1987 | US4689816 Three relay C. O. trunk interface |
| 08/04/1987 | US4685127 System for converting a No. 5 crossbar telephone switching central office to a conforming equal access central office |
| 08/04/1987 | CA1225125A1 Negative resistance compensated transformer |
| 07/21/1987 | US4682355 Electronic feeding bridge for a space division switching network |
| 06/24/1987 | EP0226017A2 Data synchronizer between a source system and a sink system |
| 06/24/1987 | CN85108929A Automatic separator for subscribers in megnetotelephon party-line system |
| 06/18/1987 | WO1987003763A1 Routing of network traffic |
| 06/04/1987 | DE3542029A1 Circuit arrangement for evaluating mutually independent signals which occur on separate line wires |
| 06/02/1987 | US4670902 Circuitry for telephone systems |
| 05/27/1987 | CN86107804A Solid state trunk circuit |
| 05/05/1987 | CA1221445A1 Semaphore terminal device for the nd 7 signalling system |
| 04/28/1987 | US4661974 Automatic route selection of a private telephone network path on the basis of a public telephone network number |
| 04/07/1987 | CA1220267A1 Digital span conversion circuit |
| 04/07/1987 | CA1220266A1 Integrated communication system |
| 03/25/1987 | EP0215339A2 Circuit arrangement performing the function of a hold inductance in exchange junction circuits of private branch exchanges |
| 02/25/1987 | CN86104257A Communication system with remote-controlled signal receiving apparatus |
| 02/24/1987 | US4645880 Disconnect circuit for use between telephone switching systems |
| 02/12/1987 | WO1987000995A1 An intermediate amplifier for use in two-wire connections of a dial telephone network and a method for the gain control of said amplifier |
| 01/28/1987 | EP0209540A1 Three relay c.o. trunk interface |
| 01/27/1987 | CA1217234A1 Data signalling system |
| 01/24/1987 | CN85101201A Extended equipment for communication system |
| 01/20/1987 | US4638123 Circuit arrangement for a small PABX with a switching matrix that has electronic crosspoints |
| 01/07/1987 | EP0207255A1 Arrangement for operating and maintaining a telecommunication exchange, especially a telephone exchange |
| 01/06/1987 | CA1216351A1 Channel selection in a switching system having clustered remote switching modules |