Patents
Sitemap › H04 - Electric communication technique › H04Q - Selecting › H04Q 1 - Details of selecting apparatus or arrangements
Patents for H04Q 1 - Details of selecting apparatus or arrangements (11,745)
11/1991
11/12/1991CA1292042C Acknowledge back pager with adaptive variable transmitter output power
11/06/1991EP0455274A2 Cable connection unit
11/05/1991US5062801 Function unit in which circuit boards are mounted on a center plane by way of distribution boards
10/1991
10/31/1991WO1991016775A1 Communication system with adaptive media access control
10/30/1991CN2087852U Sealing structure of radio-frequency signal transmission commutator
10/23/1991CN2087411U Overcurrent protecting circuit plug of telephone wiring frame
10/22/1991US5060259 Call progress capability for a switched channel data service unit
10/16/1991EP0451695A2 Method and apparatus for securing access to telecommunications based assets and services
10/15/1991US5057034 Distributor device for telecommunication systems
10/09/1991CN1055274A Double-clamped wire connector and the distribution box therewith
10/03/1991WO1991015086A1 Distributing frame for telecommunication networks
10/01/1991CA1290040C Connector bank for telecommunication devices
09/1991
09/25/1991EP0448048A2 A signal detecting circuit for detecting a signal specified in a designated frequency
09/25/1991EP0447834A2 Supporting device for cables
09/25/1991CN1054854A Connecting block for telecommunication and data technology
09/19/1991WO1991014347A1 Distribution switchboard in a telecommunication network
09/19/1991WO1991014299A1 Contact component for a distribution switchboard in a telecommunication network
09/19/1991DE4008388A1 Insulated cable core connector moulding for telecommunication appts.
09/19/1991DE4008386A1 Insulated cable core connector moulding for telecommunication appts.
09/18/1991EP0446572A1 Telecommunications and data systems engineering terminal block
09/18/1991EP0446433A2 Protection assembly for a distributor in a telecommunication network
09/17/1991CA1289281C Digital dtmf tone detector
09/14/1991CA2038169A1 Connecting block for the telecommunication and data technology
09/12/1991DE4007007A1 Verteiler in einem telekommunikatiosnetz Distribution in a telekommunikatiosnetz
09/10/1991US5047764 Paging system with dynamically programmable reception frequencies
09/10/1991CA1288855C Telephone interface connection device
09/05/1991WO1991013475A1 Plug for use in a distribution frame of a telecommunication retwork
08/1991
08/27/1991US5043977 Method and a circuit arrangement for setting the subscriber line dummy impedances of programmable hybrid circuits
08/27/1991CA1288185C Apparatus for controlling key telephone station set in key telephone system
08/21/1991CN2083370U Distribution micromodule
08/20/1991US5042038 Data path checking system
08/20/1991CA1287931C Memory organization and output sequencer for a signal processor
08/20/1991CA1287912C Distributing frame for telecommunications circuits
08/20/1991CA1287896C Terminal assembly
08/14/1991EP0441393A2 A signaling cell switching system
08/09/1991CA2035935A1 Signaling cell switching system
08/07/1991EP0440028A2 Multifrequency tone signal detector
08/07/1991EP0439942A2 Baseband signal processing unit and method of operating the same
08/07/1991CN1053721A Subminiature extending protector for communication exchange
08/06/1991US5037333 Wire-wrap connector
08/06/1991CA1287417C Digital composite tone alerting
07/1991
07/30/1991US5035645 Bracket for terminal block
07/24/1991EP0437482A1 Main distribution frame structure
07/23/1991US5034978 Universal channel unit switchable between two wire and four wire configurations
07/23/1991US5034977 Phase accumulation dual tone multiple frequency generator
07/23/1991US5034846 Plug protector
07/23/1991US5033981 Distributor strip for telecommunication systems having separating contacts
07/16/1991US5032837 Method for expanding N×N three-stage switching network to 2N×2N three-stage switching network
07/02/1991US5029160 Line concentration system
06/1991
06/26/1991EP0434193A1 Jack assembly
06/25/1991US5027389 Self-compensated dual tone multiple frequency generator
06/20/1991CA2029630A1 Jack assembly
06/18/1991US5024498 Switch box for producing freely selectable optical plug connections
06/12/1991CN1012865B Device for holding connector bank in telecommunication systems
06/05/1991EP0430569A1 Fault tolerant interconnection networks
06/04/1991US5022055 Trunk dialing converter
06/04/1991CA1284685C Indoor telephone network interface device
06/04/1991CA1284679C Tone detection process and device for implementing said process
05/1991
05/28/1991US5020099 Private branch exchange
05/23/1991CA2030672A1 Bix block adapter
05/22/1991EP0427800A1 Interlock circuit for preventing corruption of telephone line signals.
05/21/1991US5018184 Automated channel test unit
05/21/1991US5017155 Terminal boards and frame therefor
05/21/1991US5017145 Matrix switching device and method of manufacturing the same
04/1991
04/24/1991EP0423787A2 A multi-frequency signal receiver and a method of detecting the multi-frequency signal
04/17/1991CN1050806A 功能单元 Functional unit
04/10/1991EP0421960A1 Function unit for electronic equipment
04/10/1991EP0420843A1 Paging system with commands for changing functionality of a paging receiver
04/09/1991US5007000 Classification of audio signals on a telephone line
04/03/1991WO1991005454A1 A function unit for electronic equipment
04/02/1991US5004433 Interconnection device
03/1991
03/27/1991EP0418282A1 Portable call generator
03/26/1991USRE33560 Multiple telephone jack slide assembly
03/26/1991CA1282157C Wire distribution apparatus
03/19/1991US5001742 Baseband signal processing unit and method of operating the same
03/19/1991US5001602 Network interface cabinet for large pair count telephone terminations
03/19/1991CA1281785C Jack assembly
03/07/1991DE4007460A1 Rapid identification of faults and changeover in telephone network - having faults identified by 1 out of N-unit coupled back to switching network
03/05/1991US4997387 Main distributing strip for incoming and outgoing electrical lines
02/1991
02/27/1991EP0414043A1 Distribution block for a telecommunication installation
02/27/1991EP0413978A2 Protective device for a distributor in a telecommunication installation
02/20/1991CN2071855U Millisecond thermo-fusing three-safety unit
02/20/1991CN2071854U Thermal open-circuit type thermistor safety unit
02/19/1991US4995076 Call progress capability for a switched channel data service unit
02/19/1991US4995042 Switching exchange
02/19/1991CA1280465C Optical backplane
02/12/1991US4993063 Channel unit interface circuit
02/12/1991CA1280186C Connector bank for telecommunication devices
02/06/1991EP0412045A2 Digital cross-connect assembly
02/06/1991EP0411378A2 Method for generating a signal for setting certain states in a secondary control circuit of an analogue telephone set
02/06/1991CN1011562B Shell for containing electric assemblage
02/05/1991US4991057 Housing for receiving electric assemblies
02/04/1991CA2015342A1 Digital cross-connect assembly
01/1991
01/29/1991US4989176 Remote maintenance system
01/24/1991DE3921226C1 Mfg. protective plug for telephone exchange distributor - providing row of fuses and overvoltage diverters in chambers along flat, long side of plug
01/23/1991EP0409109A2 Distribution device for a telecommunication installation
01/23/1991EP0408557A1 Paging system lata switch
01/16/1991CN2069637U Oxidized resistance auto-removing device for data communication line
01/16/1991CN2069636U Fast protective device of telephone main line-distributor
01/10/1991DE3922431A1 Distributor for disparate wire lines in telecommunication exchange - employs claw or screw terminals for wire ends on contact parts in common distributor moulding housing
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