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)
05/1990
05/02/1990EP0365905A2 Process for controlling centrally controlled communication exchanges
05/02/1990EP0365780A2 Connection device for switching or disconnecting line paths in telephone exchanges
05/01/1990US4922528 Circuitry for recognizing two-tone compound signals in telephone installations
05/01/1990US4922527 Small electronic apparatus
05/01/1990CA1268570A1 Telephone tone detector
04/1990
04/25/1990EP0364658A2 Distribution device, especially for the main distributor of telephone exchanges
04/24/1990US4920561 Ring detector for telephone line
04/24/1990US4919544 Retrofit telephone network interface apparatus
04/19/1990WO1990004313A1 Main distribution frame structure
04/17/1990US4918719 Elimination of false requests for telephone operator assistance
04/10/1990CA1267711A1 Switching network
04/04/1990CN1007482B Connector band for telecommunication devices
04/03/1990US4913663 Combined transient voltage and sneak current protector
03/1990
03/27/1990US4912755 Line current test device
03/27/1990US4912452 ISDN quick connect terminating resistor
03/27/1990US4911662 Distribution frame for telecommunications cable
03/27/1990US4911661 Hinged cover for telephone connector blocks
03/22/1990WO1990003087A2 Circuit for frequency-selective detection of audio signals
03/22/1990DE3831047A1 Schaltungsanordnung zum frequenzselektiven erkennen von tonsignalen Circuit arrangement for frequency-selective recognize audio signals
03/20/1990US4910770 Network interface device and enclosure
03/20/1990US4909759 Terminal unit for cable pairs in telecommunication system
03/13/1990US4908856 Switching voltage regulator for an interface circuit in a telephone subscriber line
03/13/1990US4908825 Memory organization and output sequencer for a signal processor
03/13/1990US4907986 Adapter for station protector
03/13/1990CA1266717A1 Expansion subsystem for use in a communication system
03/07/1990CN2054242U Wrapping and butt inserting terminal board for crossbar exchanger
03/06/1990US4907263 Drain ground for telephone connector blocks
03/06/1990US4907262 Method of transmitting dual tone multi-frequency during communication in a private branch exchange using keyphones
03/06/1990US4907253 Cross-connected switch having means for removing switching modules without interrupting service
03/06/1990US4907120 Line protector for a communications circuit
03/01/1990DE3837051C1 Overvoltage protection plug for a plurality of cables which are to be protected against overvoltages
03/01/1990DE3830003A1 Circuit arrangement for signal adaptation for different telephone systems
02/1990
02/27/1990US4905275 Laminar type telephone protector block and interconnectable modular elements therefor
02/27/1990US4904211 Frame cradle for telephone connector blocks
02/20/1990US4903295 Compact solid state station protector device
02/13/1990US4901291 Wrist watch type receiver of fish sonar
02/13/1990US4901206 Wire distribution apparatus
02/08/1990DE3932700A1 Connection testing in communication network - has test signals with time channel addresses, if network is of TDM type
02/06/1990US4899376 Identification strip and holder for telephone connector blocks
01/1990
01/31/1990EP0353102A2 Automatic call distribution (ACD) switching system having distributed processing capability
01/30/1990CA1265275A1 Dial pulse detection
01/24/1990EP0351479A1 Low bit rate voice coding method and device
01/24/1990EP0351445A1 Pulse detector for counting dial generated pulses
01/11/1990DE3822427A1 Current sensor for direct-dial exchange circuits
01/09/1990US4893332 Low-powered remote sensor
01/09/1990US4893301 Automatic call distribution (ACD) switching system having distributed processing capability
01/03/1990EP0349285A2 Plug-in card module
12/1989
12/26/1989US4889977 Method of identifying the disposition of plug-in units at a warehouse
12/20/1989EP0347038A2 DTMF receiver
12/19/1989US4888797 Circuit protection device
12/19/1989CA1263970A1 Connecting block for digital system cross-connect frame
12/14/1989WO1989012368A1 Portable call generator
12/14/1989WO1989012271A1 Voice information system and method for telephone applications
11/1989
11/30/1989DE3907684A1 Schaltungsgehaeuse mit modularem aufbau Schaltungsgehaeuse with modular construction
11/30/1989DE3816948A1 Circuit arrangement for telecommunications switching installations and/or telephone exchanges, especially cross-connect switching stations, with a Closs switching network
11/21/1989US4882748 Homologated protector modules for telephone connector blocks
11/21/1989US4882647 Combination apparatus for clamping ground conductor and for mounting lightning protector
11/16/1989DE3813078A1 Retaining troughs in distributor devices of telecommunications installations
11/15/1989EP0116625B1 Multiple simultaneous tone decoder
11/15/1989CN1037239A Protected plug for connector block or breaker block
11/14/1989US4881230 Expert system for processing errors in a multiplex communications system
11/14/1989US4881229 Test circuit arrangement for a communication network and test method using same
11/14/1989US4881073 Paging system with dynamically programmable reception frequencies
11/14/1989US4880400 Wire-wrap connector
11/07/1989US4879743 PBX and adjunct using multi-frequency tones for communication therebetween
11/02/1989EP0339653A1 Matrix switching device and method of manufacturing the same
11/02/1989EP0339636A2 Trunk dialing converter
10/1989
10/31/1989US4878051 Paging system with commands for changing functionality of a paging receiver
10/25/1989EP0338598A2 Cable connection unit
10/25/1989EP0338187A2 Safety plug for switching or disconnecting rails
10/25/1989EP0324012A4 Shorted-coaxial-cable detector for local-area networks.
10/25/1989CN1036680A Telecommunications terminal block and adapter
10/25/1989CN1036674A Data path checking system
10/25/1989CN1036651A Digital composite tone alerting
10/24/1989US4876538 Paging system sublocal switch
10/24/1989US4875868 Electrically protected connector for telephone distribution frames
10/04/1989EP0335510A2 A data path checking system
09/1989
09/28/1989DE3809300A1 Device for mutually transmitting direct current signals and audio-frequency signals
09/28/1989DE3808294A1 Wall control centre
09/26/1989US4870637 Optical backplane
09/26/1989US4869682 Electrical bridging link for connecting terminals within a terminal device
09/26/1989CA1260824A1 Method for controlling bottom water coning in a producing oil well
09/26/1989CA1260535A1 Voltage surge arrester circuits
09/26/1989CA1260170A1 Subscriber line interface circuit
09/19/1989US4868873 Pulse detector for counting dial generated pulses
09/19/1989US4868872 Telephone tone detector
09/19/1989US4868861 Trunk dialing converter
09/19/1989US4868558 Paging system lata switch
09/12/1989US4866575 Wall mounted distributing frame for telecommunications circuits
09/12/1989US4865565 Sneak current protector for a communication circuit 110-type wiring block
09/06/1989EP0331371A2 Digital composite tone alerting
09/06/1989EP0330765A2 Cross-connection module for a digital telecommunication network
09/06/1989EP0330737A2 Protecting cover for a wall-mounted cabinet of a telephone installation
09/06/1989CN1035411A Shell for containing electric assemblage
09/05/1989CA1259121A1 Signal detection and discrimination using waveform peak factor
08/1989
08/31/1989DE3806263A1 Connection system for a telecommunications exchange
08/30/1989EP0330298A1 Distribution block
08/29/1989US4862314 System for providing power to a central office protector module with alarm indicator and including remote alarm indication
08/29/1989US4861287 Telephone network multiple transmission line interface
08/29/1989US4861283 Distribution frames and electrical connectors
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