| Patents for H04L 12 - Data switching networks (448,999) |
|---|
| 05/13/1981 | EP0028437A2 A high-speed time share processor for use in a data processing system |
| 05/06/1981 | EP0028188A1 Beacon system for stage-by-stage transmission of information |
| 05/06/1981 | EP0028007A1 Radio system with synchronisation of the subscribers' equipments |
| 05/05/1981 | CA1100588A1 Message verification and transmission error detection by block chaining |
| 04/29/1981 | EP0027557A2 Circuit arrangement for the transmission of digital signals between transmitting and receiving equipment operating with different data transmission modes and different data formats |
| 04/28/1981 | US4264894 Fault bypass for data transmission system |
| 04/28/1981 | US4264827 Current mode data or power bus |
| 04/28/1981 | US4264782 Method and apparatus for transaction and identity verification |
| 03/31/1981 | US4259663 Contention interference detection by comparison of transmitted and received signal information |
| 03/24/1981 | US4258434 Bit-by-bit time-division digital switching network |
| 03/24/1981 | US4258433 Digital data communication network having differing data transmission rate capabilities |
| 03/17/1981 | CA1097763A1 Method and apparatus for eliminating conflicts on a communication channel |
| 03/11/1981 | EP0024708A1 Time-slot multiple for a time division multiplex system for switching digital signals, in particular delta modulated messages |
| 03/10/1981 | US4255741 Communication module |
| 02/24/1981 | US4252994 Automatic teletypewriter |
| 02/24/1981 | CA1096478A1 Multi-drop communications device |
| 02/19/1981 | WO1981000498A1 Digital loop synchronization circuit |
| 02/17/1981 | US4251880 Digital loop switch for controlling data information having differing transmission characteristics |
| 02/17/1981 | US4251879 Speed independent arbiter switch for digital communication networks |
| 02/17/1981 | US4251684 Data storage systems |
| 02/11/1981 | EP0023852A1 Method and device for adjusting the phase of a local clock |
| 02/10/1981 | US4250561 Apparatus for receiving and/or delivering signalling characters each having a plurality of polarity changes |
| 02/03/1981 | US4248319 Circuit arrangement for connecting at least two teleprinters to a common connection line |
| 01/28/1981 | EP0023105A1 System and method for handling multiplex information |
| 01/28/1981 | EP0023074A1 Data encryption/decryption system and method for generating a key word for such a system |
| 01/28/1981 | EP0022985A2 Circuit arrangement for the detection of specific binary values of a fixed minimum duration |
| 01/27/1981 | US4247941 Simulator for bit and byte synchronized data network |
| 01/27/1981 | US4247938 Method for generating a pseudo-signal in an error rate supervisory unit and circuit for carrying out the same |
| 01/27/1981 | US4247817 Transmitting electrical signals with a transmission time independent of distance between transmitter and receiver |
| 01/27/1981 | CA1094691A1 Data transmission system |
| 01/27/1981 | CA1094641A1 Secure sca broadcasting system including subscriber actuated portable receiving terminals |
| 01/20/1981 | US4246442 Method and device for confirming correct connection between data terminals in data communication system using telephone network |
| 01/14/1981 | EP0022170A2 Method of attaining communication of data packets on a local shared bus network and local shared bus network |
| 01/13/1981 | US4245343 Automatic shunt device |
| 01/07/1981 | EP0021932A1 Switching network and telecommunication centre comprising such a network |
| 01/07/1981 | EP0021401A1 A method and apparatus for transaction and identity verification |
| 01/06/1981 | US4244046 Digital data transmission system providing multipoint communications |
| 01/06/1981 | US4243836 Digital autostart circuit |
| 12/30/1980 | US4242749 Operating system for a data transmission system |
| 12/30/1980 | US4241802 Method and circuit arrangement for switching signals having different transmission speeds within a program-controlled data exchange system |
| 12/23/1980 | US4241444 Arrangement for time-division multiplex PWM data transmission |
| 12/23/1980 | US4241330 Multiple-processor digital communication system |
| 12/11/1980 | WO1980002784A1 Digital data communication system |
| 12/10/1980 | EP0020255A1 Switching level of an operator for a packet-switched digital data network |
| 12/10/1980 | EP0019920A1 Digital data communication system |
| 12/09/1980 | US4238851 Packet transmission system |
| 12/02/1980 | US4237553 Data packet multiplexing in a staggered fashion |
| 12/02/1980 | US4237550 Multiuser protected optical data bus distribution systems |
| 12/02/1980 | US4237483 Surveillance system |
| 12/02/1980 | US4237447 Speed independent selector switch for digital communication networks |
| 11/25/1980 | US4236245 Ring communication system data packets reusable a variable number of times |
| 11/25/1980 | US4236087 Programmable bus driver isolation |
| 11/18/1980 | US4234969 Bidirectional optical coupler for a data processing system |
| 11/18/1980 | US4234952 Conflict resolution by retransmission delay on shared communication medium |
| 11/18/1980 | US4234869 Merchandise display and categorical indicators |
| 11/12/1980 | EP0018938A1 Digital time-division multiplex telecommunication system |
| 11/12/1980 | EP0018756A2 Speed independent arbiter switch for digital communication networks |
| 11/12/1980 | EP0018755A1 Digital communication networks employing speed independent switches |
| 11/12/1980 | EP0018754A1 Speed independent selector switch for digital communication networks |
| 11/12/1980 | EP0018517A1 Diagnostic and alarm apparatus for a data communication network |
| 11/11/1980 | US4233589 Active T-coupler for fiber optic local networks which permits collision detection |
| 11/04/1980 | CA1089049A1 Method for data transmission and a system for carrying out the method |
| 10/28/1980 | US4231015 Multiple-processor digital communication system |
| 10/15/1980 | EP0017035A1 Circuit arrangement for transmitting digital signals between transmitter/ receiver devices using different data transmission procedures and different data formats |
| 10/15/1980 | EP0017034A1 Circuit arrangement for delivering digital communication signals in relation to broadcast connections by a data switching exchange |
| 10/14/1980 | US4228424 Central station alarm |
| 10/07/1980 | US4227178 Decentralized data transmission system |
| 10/07/1980 | US4227045 Data processing protocol system |
| 10/07/1980 | CA1087258A1 Circuit for wire transmission of high frequency data communication pulse signals |
| 10/01/1980 | EP0016637A1 Passive coupling arrangement and distributed data processing system including such arrangements |
| 10/01/1980 | EP0016477A1 Method and device for speech signal reconstruction in packet switched telecommunication networks |
| 09/30/1980 | US4225919 Advanced data link controller |
| 09/30/1980 | US4225753 Data transmission systems |
| 09/23/1980 | US4224684 Receive/bypass circuit for subsystems in polling system |
| 09/03/1980 | EP0014926A1 Interprocessor connection system |
| 09/02/1980 | CA1085071A1 Digital data transmission system providing multipoint connections |
| 09/02/1980 | CA1085015A1 Access method to a common transmission channel for a plurality of data stations in a data transmission system, and arrangement for executing said method |
| 08/26/1980 | US4219697 Automatic remote operate circuit |
| 08/20/1980 | EP0014583A1 Improvements in or relating to fault-finding apparatuses |
| 08/20/1980 | EP0014556A1 A multiplex information handling system and a vehicle incorporating this system |
| 08/19/1980 | US4218756 Control circuit for modifying contents of packet switch random access memory |
| 08/19/1980 | CA1084171A1 Motor control device for data terminals |
| 08/07/1980 | WO1980001615A1 Enhanced communications network testing and control system |
| 08/06/1980 | EP0014152A1 Operator for a packet-switched data network |
| 07/29/1980 | US4215251 Switching apparatus selectively utilizing a regenerative repeater |
| 07/29/1980 | CA1082787A1 Method and apparatus for signaling in a communication system |
| 07/15/1980 | US4213007 Method and apparatus for monitoring a pulse-code modulated data transmission |
| 07/01/1980 | US4210780 Multiple access digital communications system |
| 06/25/1980 | EP0012281A1 Method and circuit arrangement for switching and delivery of signals in or from a stored programme-controlled exchange |
| 06/10/1980 | CA1079407A1 Error control for digital multipoint circuits |
| 06/03/1980 | US4206322 Time-division switching system for multirate data |
| 05/28/1980 | EP0011540A1 Input-output interface device between a data switcher and a plurality of transmission lines |
| 05/27/1980 | US4205326 Data communication apparatus |
| 05/15/1980 | WO1980001028A1 Signal switching device through optical means and self switches comprising such device |
| 05/15/1980 | WO1980001025A1 Autonomous terminal data communication system |
| 05/15/1980 | WO1980001008A1 Coupling circuit for transferring data signals at a high rate |
| 05/13/1980 | US4203001 Apparatus for establishing multi-address and conference call connections |
| 04/30/1980 | EP0010264A1 Teleprinter private branch exchange |
| 04/22/1980 | US4199663 Autonomous terminal data communications system |
| 04/22/1980 | US4199662 Hybrid control of time division multiplexing |