Patents
Sitemap › H04 - Electric communication technique › H04L - Transmission of digital information, e.g. telegraphic communication › H04L 12 - Data switching networks
Patents for H04L 12 - Data switching networks (448,999)
04/1980
04/22/1980US4199661 Method and apparatus for eliminating conflicts on a communication channel
04/17/1980WO1980000775A1 Time-division switching system for multirate data
04/16/1980EP0009824A1 Packet-switched communication system
04/16/1980EP0009627A1 Transmission system for telecopying and for the electronic transfer of house post
04/16/1980EP0009551A1 Circuit for polling terminals in a data transmission system
04/08/1980US4197523 Digital telecommunication switching systems
04/02/1980EP0009461A2 Circuit arrangement for subscriber stations
04/02/1980EP0009256A2 Control word source for time-division switching system accomodating multirate data
04/01/1980US4196310 Secure SCA broadcasting system including subscriber actuated portable receiving terminals
03/1980
03/25/1980US4195351 Loop configured data transmission system
03/11/1980US4193061 Electronic authentication system
03/11/1980US4192966 Circuit arrangement for determining specific characters occurring directly consecutively in a sequence of characters, in particular for teleprinter exchange systems
03/05/1980WO1981000655A1 Wire data transmission system
03/05/1980EP0008416A1 Arrangement for transmitting digital data signals
03/04/1980US4191941 Switch matrix for data transfers
03/04/1980US4191848 Teletypewriter motor controlling
03/04/1980US4191847 Circuit arrangement for determining input signals which exceed a given minimum duration, in particular for teleprinter exchanges
02/1980
02/26/1980US4190821 Self-healing loop communications system
01/1980
01/29/1980US4186380 Multi-terminal computer system with dual communication channels
01/29/1980US4186379 High-speed data transfer apparatus
01/23/1980EP0007069A1 Circuit arrangement for the connection of alternatively one of at least two teleprinters to a common connecting line
01/23/1980EP0006986A1 Data transmission system as well as method and circuit arrangement for running such a data transmission system
01/09/1980EP0006798A1 Digital communication system with high data throughput in a meshed network
01/09/1980EP0006595A1 Circuit arrangement for establishing connections between data lines and a time division multiplex transmission highway
01/09/1980EP0006325A1 Data transmission system for interconnecting a plurality of data processing terminals
01/09/1980EP0006145A1 Circuit arrangement for a telecommunication exchange with microprocessors
01/01/1980US4181909 Method and appratus for initializing remote data communication equipment
12/1979
12/12/1979EP0005784A1 Apparatus for establishing broadcast connections and conference call connections
12/11/1979US4178504 Balanced termination for a transmission line
12/11/1979CA1068007A1 Automatic terminal data rate selection
12/04/1979US4177454 Digital display system
12/04/1979US4177450 Process and method to initiate a receiving and transmitting station linked by a connecting channel of an information exchange system consisting of several transmitting and receiving stations
11/1979
11/28/1979EP0005489A1 Method and circuit arrangement for data transmission between a central station and one of a plurality of data subscribers in an envelope-structured synchronous data network
11/27/1979US4176401 Digital communications system
11/13/1979CA1066396A1 Time division multiplex telecommunication exchange
10/1979
10/31/1979EP0005045A1 Data-pulse communication system and adapter
10/03/1979EP0004376A2 Multiple access bus communications system
10/02/1979CA1063704A1 Closed user group facility
09/1979
09/18/1979US4168401 Digital switching unit for a multirate time-division multiplex digital switching network
09/18/1979US4168400 Digital communication system
09/11/1979CA1062374A1 System of transmitting messages between a plurality of stations
09/05/1979EP0003849A2 Digital bus communications system
08/1979
08/22/1979EP0003706A1 Multipoint time division digital transmission system
08/22/1979EP0003493A1 Data transmission system between stations connected in a loop
08/21/1979CA1060976A1 Time division switching network for switching multirate multiplexed data
07/1979
07/24/1979US4162486 Encoded electrical control systems
07/17/1979US4161786 Digital bus communications system
07/17/1979US4161623 Code generator for text transmission devices
07/17/1979CA1058729A1 Digital register sender and line circuit for data switch
07/10/1979US4160874 Process for signaling an interruption in the state of readiness for the reception in data terminal devices in which data are exchanged
07/03/1979US4160128 Digital data transmission system providing multipoint connections
07/03/1979CA1057837A1 Line switching system for digital data
06/1979
06/26/1979US4159470 Data communications systems employing redundant series transmission loops
06/19/1979USRE30037 Data communications network remote test and control system
06/12/1979CA1056510A1 Multipoint data communication system
06/12/1979CA1056485A1 Call initiation delay arrangement for digital data switching system
06/05/1979CA1056065A1 Digital data communications system packet switch
05/1979
05/29/1979US4156847 Method and apparatus for confirming transmission in bidirectional CATV system
05/29/1979US4156798 Small packet communication network
05/22/1979US4156106 Multiplex-data bus modulator/demodulator
05/22/1979CA1055162A1 Arrangement for switching of data
05/15/1979US4154983 Loop carrier system for telecommunication and data services
05/15/1979CA1054721A1 In band signalling
05/15/1979CA1054692A1 Communication transmission installation
05/08/1979CA1054243A1 Multipoint data communications system utilizing multipoint switches
04/1979
04/10/1979US4149030 Multi-drop communications device
03/1979
03/27/1979CA1051348A1 Dial-operated teleprinter exchange systems
03/20/1979US4145715 Surveillance system
03/13/1979US4144410 Multiplex communication system
03/13/1979US4144407 Multiprocessor system for automatic switching of telegraphic lines
03/13/1979US4144406 Time-multiplex modular switching network for automatic exchange
02/1979
02/27/1979US4142156 Control signal apparatus for CATV system
02/27/1979US4141332 Encoded electrical control systems for vehicles
02/20/1979US4140918 Electrical jack and patch cord assemblies
02/06/1979CA1048133A1 Programme-controlled data switching systems
01/1979
01/23/1979US4136399 Dynamic channel allocation buffer matrix
01/23/1979US4136384 Loop type data highway system
01/23/1979US4136261 Automatic answering device in facsimile
12/1978
12/19/1978US4130885 Packet memory system for processing many independent memory transactions concurrently
12/05/1978US4128882 Packet memory system with hierarchical structure
11/1978
11/28/1978US4127745 Date time-multiplex switching network for use in a telecommunications exchange
11/14/1978CA1042531A1 Temperature sensitive control circuit
11/07/1978US4124887 Real time computer control system for automatic machines
10/1978
10/24/1978US4122301 Selection of branch lines of multipoint junction circuits
10/17/1978US4121047 Circuit arrangement for the switching on and off of a teleprinter PBX exchange
10/03/1978CA1039866A1 Semi static time division multiplex slot assignment
09/1978
09/26/1978US4117269 Time division multiplex telecommunication exchange
09/12/1978US4114139 Security controlled information exchange system
09/05/1978US4112488 Fault-tolerant network with node branching
09/05/1978US4112369 Secure SCA broadcasting system including subscriber actuated portable receiving terminals
09/05/1978US4112264 Testing and switching system including remotely controllable stations for information transmission and communications networks and systems
09/05/1978US4112260 AC type line concentrator
09/05/1978CA1038091A1 Method of transmitting information and multiplexing device for executing the method
07/1978
07/25/1978US4103336 Method and apparatus for allocating bandwidth on a loop system coupling a cpu channel to bulk storage devices
07/25/1978US4103288 Method for data transmission and a system for carrying out the method
07/04/1978US4099024 Communications network repeater
06/1978
06/20/1978US4096355 Common channel access method for a plurality of data stations in a data transmission system and circuit for implementing the method
06/13/1978US4095045 Method and apparatus for signaling in a communication system
06/06/1978US4093819 Closed user group facility
04/1978
04/25/1978US4086534 Circuit for wire transmission of high frequency data communication pulse signals
1 ... 4479 4480 4481 4482 4483 4484 4485 4486 4487 4488 4489 4490