Patents
Sitemap › H04 - Electric communication technique › H04M - Telephonic communication › H04M 7 - Arrangements for interconnection between switching centres
Patents for H04M 7 - Arrangements for interconnection between switching centres (24,777)
12/1986
12/30/1986US4633040 Personal branch exchange system
12/16/1986CA1215454A1 Switching system having remote switching capability
12/16/1986CA1215453A1 Control communication in a switching system having clustered remote switching modules
12/10/1986EP0203938A1 Interswitch line circuit
12/09/1986US4628505 Signaling terminal system for CCITT No. 7 common channel signaling system
12/03/1986EP0203614A2 Inter-network connection system
12/03/1986EP0203551A2 PCM communication apparatus
12/03/1986CN86103604A Inter-network connection system
11/1986
11/19/1986CN85103986A Station interface of digital electronic telephone switch system having voice frequency data concentrating processor
11/18/1986US4623760 Signaling protocol interface channel unit
11/18/1986CA1214219A1 General purpose data control system
11/12/1986CN86101057A Method and apparatus for efficient resource allocation
11/06/1986WO1986006569A1 Method and apparatus for efficient resource allocation
11/05/1986EP0200353A2 Telecommunication system
11/05/1986CN85108983A Long-distance communication device circuitary structure, in particular telephone junction device, a type signal is pre-transmitted always in them, when informations are transmitted
11/05/1986CN85103813A Telecommunication system, in particular telephone system
10/1986
10/15/1986EP0197312A1 Circuit operation method for telecommunication exchanges, especially telephone exchanges with subexchanges, especially concentrators connected to exchanges by connection channels
10/15/1986EP0197304A1 Circuit arrangement for telecommunication exchanges, especially telephone exchanges with subexchanges, especially concentrators connected to exchanges by connection channels
10/15/1986EP0197290A1 Circuit arrangement for telecommunication exchanges, especially telephone exchanges, in which a type information precedes the information to be transmitted
09/1986
09/24/1986CN86100092A Improved three relay central office trunk interface
09/17/1986CN85109222A Interswitch line circuit
09/09/1986US4611096 Telephone office service assist and handoff
08/1986
08/27/1986CN85107283A Telephone system circuitry
07/1986
07/31/1986WO1986004472A1 Three relay c.o. trunk interface
07/09/1986EP0186770A2 Circuit arrangement for telecommunication exchanges, especially telephone exchanges, with subexchanges connected to exchanges via line bundles
07/08/1986CA1207475A1 Telephone line interface
07/02/1986EP0185929A2 Circuit arrangement for telecommunication exchanges, especially telephone exchanges, with subexchanges connected to exchanges via line bundles
07/01/1986US4598268 Digital span conversion circuit
06/1986
06/24/1986CA1206646A1 Loop-circuit for telephone line
06/10/1986US4594477 PBX equipment with dial signal modification
05/1986
05/20/1986US4590473 Data signalling system
05/14/1986EP0181316A2 Circuit arrangement for telephone networks
05/09/1986WO1986002795A1 Interswitch line circuit
05/07/1986EP0179979A2 Synchronous packet voice/data communications system
04/1986
04/15/1986US4583218 Control communication in a switching system having clustered remote switching modules
04/01/1986CA1202742A1 Loop-start/ground-start line interface circuit
02/1986
02/25/1986CA1201181A1 Start-up circuit for negative inductance multiplier
01/1986
01/28/1986US4567329 Line circuit for network junctor
01/21/1986US4566094 Channel selection in a switching system having clustered remote switching modules
01/15/1986EP0168258A2 Loop transmission system
01/07/1986US4563547 Loop-start/ground-start line interface circuit
11/1985
11/21/1985EP0161253A1 Interface channel unit.
11/19/1985US4554504 Negative resistance compensated transformer
10/1985
10/29/1985US4550404 Switching system having remote switching capability
10/08/1985CA1195019A1 Additional line coupling circuit to an intercom telephone set
08/1985
08/13/1985US4535202 Loop-circuit for telephone line
07/1985
07/16/1985US4529845 Optical coupling interface circuit for telephone line ringing signal indication or detection
07/16/1985CA1190680A1 Current sink for dpt channel unit
07/03/1985EP0146868A1 Signal terminals device for signalling system no. 7
06/1985
06/19/1985EP0144794A2 Circuit arrangement to distinguish and evaluate alternating-voltage signals on trunk lines
06/18/1985CA1189209A1 Detector circuit for communication lines
06/11/1985US4523308 Telephone concentrator switch arrangement
06/04/1985CA1188439A1 Telecommunication system with radio link
05/1985
05/09/1985WO1985002083A1 Interface channel unit
04/1985
04/23/1985CA1186041A1 Call-for-service and continuity sensor circuit
04/03/1985EP0115507A4 General purpose data control system.
03/1985
03/12/1985US4504702 Additional line coupling circuit to an intercom telephone set
03/12/1985CA1183941A1 Arrangement for providing a flickerless ordered dither image for a video display
02/1985
02/27/1985EP0133577A1 Data transmission system in a digital transmission network and arrangement for the use of this system
02/18/1985EP0116577A4 Data signalling system.
01/1985
01/22/1985US4495494 Detector circuit for communication lines
01/15/1985US4494229 Interconnecting apparatus for a distributed switching telephone system
01/15/1985CA1181158A1 Telephony system with automatic test call generator for remote port groups
01/15/1985CA1181134A1 Communications system and network
12/1984
12/11/1984US4488004 Providing feature transparency between a plurality of PBXs
12/05/1984EP0127517A1 Junction circuit for an exchange trunk
11/1984
11/21/1984EP0125605A2 Channel selection in a switching system having clustered remote switching modules
11/21/1984EP0125604A2 Switching system having remote switching capability
11/21/1984EP0125602A2 Control communication in a switching system having clustered remote switching modules
10/1984
10/03/1984EP0120459A2 Circuit arrangement for a small PBX with a switching device with electronic switching points
09/1984
09/04/1984CA1173942A1 Maintenance processing apparatus for remote port units in a telephone switching system
08/1984
08/29/1984EP0116577A1 Data signalling system.
08/21/1984US4467269 Start-up circuit for negative inductance multiplier
08/15/1984EP0115507A1 General purpose data control system.
04/1984
04/04/1984EP0104637A2 Circuit arrangement for telecommunication exchanges, especially telephone exchanges, with central information processors having overload signal transmission
04/03/1984US4440979 Current sink for DPT channel unit
03/1984
03/21/1984EP0103293A2 Integrated communication system
02/1984
02/16/1984WO1984000655A1 General purpose data control system
02/16/1984WO1984000652A1 Data signalling system
02/01/1984EP0099761A2 Junction circuit for coupling an additional line to an intercommunication set
01/1984
01/25/1984EP0099272A2 Loop circuit for a telephone line
01/25/1984EP0099128A2 Circuit for delivering direct current signalisation signals to a signalisation signal convertor
01/17/1984CA1160780A1 Trunk interface circuit with current compensation
01/17/1984CA1160779A1 Ac supervisory signal detector
12/1983
12/27/1983US4423292 Detector circuit for communication lines
12/20/1983CA1159131A1 Distributed cbx system employing packet network
12/07/1983EP0095675A2 Circuit for a telephone exchange with line junctors which are individually allocated to connections
10/1983
10/26/1983EP0091999A1 Communications system and central station therefor
09/1983
09/20/1983CA1154186A1 Speech networks for telephone sets
08/1983
08/09/1983US4398064 Call-for-service and continuity sensor circuit
06/1983
06/07/1983US4387277 Four wire to two wire converter
05/1983
05/24/1983US4385380 Digital concentrator switch
04/1983
04/14/1983WO1983001355A1 Detector circuit for communication lines
03/1983
03/31/1983WO1983001168A1 Arrangement for providing a flickerless ordered dither image for a video display
03/22/1983US4377821 Arrangement for providing a flickerless ordered dither image for a video display
03/01/1983CA1142281A2 Transformerless trunk circuit
11/1982
11/30/1982US4361885 System for channel-specific releasing and blocking of telephone channels in converters of a time division multiplex system for pulse code modulation
11/30/1982US4361732 Trunk interface circuit with current compensation
10/1982
10/20/1982EP0062701A1 Method for the transmission of loop conditions and metering pulses in telephone systems
10/06/1982EP0061524A1 Method for the bidirectional transmission of binary data signals on a signal line closed on both sides by a transformer
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