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)
01/1991
01/10/1991DE3921228A1 Distributor strip for telephone exchange - has pressed metal contact inserts shaped to provide high contact force against pin
01/10/1991DE3921227A1 Telecommunication distributor arrangement with elongated moulding - allows protection by single plug or separate plugs with spring fingers contacting common earth conductor
01/10/1991DE3921224A1 Elongated connection moulding for telecommunication distributor - contains channels with progressively increased spacing for outgoing wires from operational face to corresp. connection elements
01/10/1991DE3921204A1 Distributor strip for telephone exchange - has two lines of strip metal contacts engaged by inserted pins
01/08/1991CA1278812C Work surface with power and communication module
01/02/1991EP0405512A2 Signal detection device for the evaluation of multifrequency coded signals
01/02/1991EP0405336A2 Distribution device for telecommunications systems
12/1990
12/27/1990EP0404002A1 Detector for low frequency alternating signals for a telephone trench
12/27/1990EP0404001A1 Signalisation detector, for metering type signals, for a telephone trunk
12/27/1990EP0403864A2 Distribution block for telecommunication exchanges with break contacts
12/27/1990EP0232317B1 Apparatus for providing a ground reference for telephone customer special circuits powered from a floating battery feed
12/20/1990DE3919346A1 Coupling network unit with several coupling modules - which are combined on common circuit board with plug connectors, orthogonal to board plane
12/19/1990EP0403451A1 A method and arrangement for detecting and localizing errors or faults in a multi-plane unit incorporated in a digital time switch
12/19/1990EP0402658A2 Terminal distribution block for incoming and outgoing electrical lines
12/19/1990EP0402358A1 Paging system sublocal switch
12/18/1990US4979214 Method and apparatus for identifying speech in telephone signals
12/18/1990US4979209 Individual subscriber line module
12/18/1990US4979171 Announcement and tone code generator for telephonic network and method
12/17/1990WO1990016132A1 A method and arrangement for detecting and localizing errors of faults in a multi-plane unit incorporated in a digital time switch
12/12/1990EP0401223A1 Paging system with dynamically programmable reception frequencies
12/12/1990CN2067471U Multistage safety device for communication equipment
12/11/1990CA1277738C Telephone cable wire connector
12/06/1990DE4005027A1 Voice-band line signal reception in telecommunication exchange - preventing untimely disconnection of line with use of already available information on type of connection
12/04/1990US4975072 Front facing terminal block for telecommunication main distribution frame
11/1990
11/28/1990EP0399628A2 Terminal block with surcharge protection
11/22/1990EP0398041A2 Switch with a circuit arrangement for testing the speech path interconnection of a coupling device
11/21/1990CN1010542B Multi-frequency signal receiver
11/20/1990US4972466 Digital composite tone alerting
11/20/1990US4972452 Digital bypass for telephone system
11/20/1990CA1276715C Arrangement for main distribution frames
11/15/1990WO1990013959A1 Interlock circuit for preventing corruption of telephone line signals
11/14/1990CN2065802U Straight line modular for distribution frame
11/13/1990CA1276300C Method of collecting and using data associated with tagged objects
11/07/1990EP0396241A2 Cross connect frame
11/07/1990CN1010357B Connection block for telecommunication engineering
11/06/1990US4968260 Bix block adapter
11/06/1990CA1276039C2 Microcomputer controlled door locking system
11/01/1990WO1990013156A1 Telephone connector block construction
10/1990
10/31/1990EP0394339A1 Acknowledge back pager with adaptive variable transmitter output power
10/31/1990DE4008934C1 Dummy plug holding device in distributing unit - has rounded boss engaging receiving channel of contact unit
10/24/1990CN1046432A Improvement in or relating to exchanges
10/17/1990EP0392958A1 A cable system including a rack
10/10/1990EP0391524A2 Phase accumulation dual tone multiple frequency generator
10/10/1990EP0391229A2 Device for the recognition of a signal frequency
10/10/1990EP0390976A1 Process for communication exchanges with audio frequency push-button dialing
10/10/1990CN2063696U Anastomasis box of wire connection arrangement with rotary self-stripping capability
10/02/1990CA1274882A1 Configurable electrical circuit having configurable logic elements and configurable interconnects
09/1990
09/30/1990CA2013390A1 Exchanges
09/26/1990CN1045675A Interface circuit with transient event tolerance
09/19/1990EP0388021A2 Interface circuit with transient event tolerance
09/19/1990EP0387953A1 Device for connecting a subscriber line to a selected internal line
09/19/1990EP0387388A1 Wall exchange
09/18/1990US4958262 Apparatus and method for facilitating double blocking at a distributing frame in a telephone central office
09/13/1990DE3907412A1 Housing system for accommodating electrical push-in units
09/06/1990DE3906894A1 Wiring arrangement for a distributor in a telecommunications system
08/1990
08/30/1990DE3925124C1 Lead tester for telephone exchange distributor - has adaptor with spring flaps at front of housing over outer contact surfaces
08/30/1990DE3922433C1 Laminated distributor for telephone exchange - includes recess in form of cylindrical ridged protuberance forming abutment at point
08/30/1990DE3906697A1 Arrangement for detecting a signal within a particular frequency band
08/28/1990US4953194 Automated documentation system for a communications network
08/21/1990CA1273093A1 Container for telephone network interface device
08/16/1990EP0382091A2 Entrance distributor for private branch exchanges
08/15/1990CN1009235B Connector bank for cable wires, in particular of telephone cables
08/14/1990US4949376 Telephone network interface apparatus
08/08/1990CN1044538A Method of testing connecting and/or switching devices and/or lines
08/01/1990EP0380137A2 Line concentration system
08/01/1990EP0379695A1 Method of testing transmission and/or switching equipment and/or lines
08/01/1990CN1008975B Guiding device for making 24 lane or 12 lane copper based silver-cerium composite materials
07/1990
07/31/1990US4945560 Telephone network interface apparatus
07/31/1990US4945559 Telephone network interface apparatus
07/31/1990US4945555 Method and means for remote testing of unused telephone lines
07/31/1990CA1272263A1 Energy management system
07/25/1990CN1044198A Circuit for center controlling telecommunications exchange apparatus, particularly, pcm telephone exchange apparatus, with center conneting members and thereof connect with subconnecting members
07/24/1990US4944001 Rotary dial pulse receiver
07/19/1990DE3921225C1 Protective device for distributor in telecommunications system - has over-voltage arrester with wire-type terminal pins, e.g. for telephone exchange
07/18/1990EP0211865B1 Supervisory tone detection
07/10/1990US4941165 Hot cut procedure for telecommunications network
07/03/1990US4939765 Interlock circuit for preventing corruption of telephone line signals
06/1990
06/27/1990CN1043417A Telephone protection circuit
06/27/1990CN1043416A System for connecting optical lines to wideband telecommunications exchange
06/26/1990US4937851 Loop status verification system
06/23/1990CA2006367A1 Method of testing connecting and/or switching devices and/or lines
06/19/1990US4935957 Key telephone system
06/19/1990CA1270585A1 Rotary dial pulse receiver
06/19/1990CA1270553A1 Telephone line protector with line disconnect and an entrance terminal assembly incorporating a plurality of protectors
06/14/1990WO1990006408A1 Floor structure
06/13/1990EP0372673A2 Telephone protection circuit
06/13/1990EP0372446A1 Device for connecting optical lines with a broadband telecommunication exchange
06/13/1990CN2058290U Crossbar exchanger being able to keep registers from damage due to high tension voltage
06/12/1990CA1270316A1 Cross connect frame for digital signals
06/05/1990US4932051 Telephone network interface apparatus
06/05/1990US4932043 Apparatus for controlling key telephone station set in key telephone system
06/05/1990US4931791 Shorted-coaxial-cable detector for local-area networks
05/1990
05/29/1990US4930152 Call return telephone service
05/29/1990US4930046 Apparatus by which auxiliary slide-in units are connected to slide-in units
05/23/1990EP0369524A2 Distribution rack for making freely selectable optical connections
05/15/1990US4926461 Telephone answering machine having call transfer capabilities
05/15/1990CA1269173A1 Combined analog/digital ccis data transmitter/receiver circuit
05/15/1990CA1269156A1 Subscriber pair identification system
05/08/1990US4924501 Dial pulse selection
05/08/1990US4924345 Combined transient voltage and sneak current protector
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