| Patents for H04L 1 - Arrangements for detecting or preventing errors in the information received (103,402) |
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| 03/08/1989 | EP0306020A2 Error correction coding and decoding circuit for digitally coded information |
| 03/08/1989 | EP0305994A2 Data communication system having means for switching between main and stand-by apparatuses |
| 03/08/1989 | EP0090019B1 Multiple source clock encoded communications error detection circuit |
| 03/07/1989 | US4811359 Protection channel monitoring system using a check signal comprising two different N-bit code patterns sequentially arranged at random |
| 03/07/1989 | US4811357 Secondary channel for digital modems using spread spectrum subliminal induced modulation |
| 03/07/1989 | US4811277 Communication interface |
| 03/07/1989 | US4811015 Abnormal data transmission detection circuit for time-division multiplex transmission network system |
| 03/07/1989 | CA1250945A1 System for detecting a transmission error |
| 03/02/1989 | DE3727579A1 Circuit arrangement having an integrator and a threshold value switch |
| 03/01/1989 | EP0305036A2 Pseudorandom word sequence synchronizer |
| 02/28/1989 | US4809296 Method for transmitting data via the lines of a power supply system |
| 02/28/1989 | US4809274 System for processing audio signals |
| 02/28/1989 | US4809268 Multipoint data communication with a supervisory system for detecting a malfunctioning remote station |
| 02/28/1989 | CA1250673A1 Subscriber rf telephone system for providing multiple speech and/or data signals simultaneously over either a single or a plurality of rf channels |
| 02/22/1989 | EP0303830A2 Multicast data distribution system |
| 02/21/1989 | US4807224 Multicast data distribution system and method |
| 02/15/1989 | EP0303410A2 Non-linear squelch circuit |
| 02/14/1989 | US4805208 Modem compression system for telephone network |
| 02/14/1989 | US4805193 Protection of energy information in sub-band coding |
| 02/09/1989 | DE3736270A1 Circuit arrangement for monitoring the remote end of a data transmission link |
| 02/08/1989 | CN1031004A 信息传输系统 Information transmission system |
| 02/07/1989 | US4803685 Method and device for the transmission of digital data by messages organized in frames |
| 02/07/1989 | CA1249886A1 Method of duplex data transmission using a send-and- wait protocol |
| 02/07/1989 | CA1249866A1 Routing mechanism with encapsulated fcs for a multi- ring local area network |
| 02/02/1989 | DE3723343A1 Method for transmitting an additional digital signal in an FM broadcast signal |
| 02/01/1989 | EP0301636A1 Transceiver arrangement for full-duplex data transmission comprising an echo canceller and povision for testing the arrangement |
| 02/01/1989 | EP0301161A2 Method and apparatus for processing a convolutional code for transmission and for decoding the received code |
| 01/31/1989 | US4802171 Method for error correction in digitally encoded speech |
| 01/31/1989 | US4802167 Data monitor apparatus |
| 01/25/1989 | CN1030680A Device for detecting bit phase difference |
| 01/24/1989 | US4800562 Circuit and method for monitoring the quality of data in a data stream |
| 01/18/1989 | EP0299251A2 Communication filter |
| 01/17/1989 | US4799237 Channel-system exchange system for digital data radio-communication system |
| 01/10/1989 | US4797903 Channel switching system without instantaneous signal loss |
| 01/10/1989 | US4797625 Device for detecting bit phase difference |
| 01/10/1989 | CA1248604A1 Loop around data channel unit |
| 01/10/1989 | CA1248590A1 Wide band data transmission over an electricity distribution network |
| 01/03/1989 | US4796278 Repeater for digital communication system |
| 01/03/1989 | US4796257 Bipolar violation rate calculation method |
| 01/03/1989 | CA1248182A1 Multidimensional, convolutionally coded communication systems |
| 12/21/1988 | EP0295897A2 Multiplex wiring system |
| 12/21/1988 | EP0295426A2 Method and apparatus for generating alert messages in a communication network |
| 12/20/1988 | US4792952 Signal receiver |
| 12/20/1988 | US4792950 Multiplex wiring system |
| 12/15/1988 | WO1988010038A1 Process for tracing defective stations in local networks and corresponding interface controller |
| 12/15/1988 | WO1988010035A1 Protection of energy information in sub-band coding |
| 12/15/1988 | WO1988009969A1 Process-to-processor communications protocol for a public service trunking system |
| 12/15/1988 | WO1988009967A1 Method for error correction in digitally encoded speech |
| 12/14/1988 | EP0295226A1 Apparatus in a mobile telephone receiver for reducing bit error |
| 12/13/1988 | US4791653 Pseudorandom word sequence synchronizer |
| 12/13/1988 | US4791485 System for detecting a transmission error |
| 12/06/1988 | US4789948 Method and apparatus for determining communications link quality and receiver tracking performance |
| 12/06/1988 | US4789902 Image signal processing method |
| 12/06/1988 | CA1246148A1 Radio system wherein transmission power is varied according to transmission quality |
| 12/01/1988 | WO1988009590A1 Method and system for checking errors of signal being transferred through transmission line |
| 11/30/1988 | EP0292966A2 Digital communication apparatus |
| 11/29/1988 | US4788694 Data transmitter |
| 11/29/1988 | CA1245780A1 Method of reconstructing lost data in a digital voice transmission system and transmission system using said method |
| 11/23/1988 | EP0291961A2 Method of and device for decoding block-coded messages affected by symbol substitutions, insertions and deletions |
| 11/23/1988 | EP0291671A2 Apparatus and method for deferred parity checking of control signals across a bidirectional data transmission interface |
| 11/17/1988 | WO1988009093A1 Control of optical systems |
| 11/17/1988 | EP0290541A1 Hf radio communications system with frequency management. |
| 11/17/1988 | EP0290526A1 Hf data communications system with network management. |
| 11/17/1988 | EP0290525A1 Data transmission system with automatic repeat request. |
| 11/15/1988 | US4785467 Transmission system employing high impedance detection for carrier detection |
| 11/08/1988 | US4783786 CMI signal transmission system |
| 11/03/1988 | DE3810576A1 Eingebettetes pruefsystem fuer das pruefen der uebereinstimmung von kommunikationssystemen Embedded testing system for checking the conformity of communication systems by |
| 11/02/1988 | EP0289384A1 Method for automatically selecting a directional reception antenna among a plurality of reception antennae |
| 11/01/1988 | US4782512 Interfacing data units to a telephone line |
| 10/26/1988 | EP0287586A1 Data transmission system and method for use therein. |
| 10/25/1988 | US4780895 Circuit for stabilizing the rate at which pulses appear |
| 10/25/1988 | US4780888 Method and arrangement for disturbance-proof recognition of data contained in data signals |
| 10/25/1988 | US4780886 Device for detecting a data signal energy drop |
| 10/25/1988 | US4780883 In a data communication system |
| 10/25/1988 | US4780869 Local area network redundancy system |
| 10/20/1988 | WO1988008233A1 Data transmission method |
| 10/20/1988 | WO1988008140A1 Mobile radio network for nationwide communications |
| 10/19/1988 | EP0287119A2 Serial data processor capable of transferring data at a high speed |
| 10/18/1988 | US4779274 Request repeat method for data communication |
| 10/18/1988 | CA1243356A1 Error control encoding system |
| 10/12/1988 | EP0286609A1 Encoding method in transmission of plurality of oversampled data channels, and apparatus for carrying out the method |
| 10/12/1988 | EP0286383A2 Multiplex transmission system |
| 10/12/1988 | EP0286295A2 Signaling arrangement |
| 10/11/1988 | US4777662 Optical communication process |
| 10/04/1988 | US4775976 Method and apparatus for backing up data transmission system |
| 09/27/1988 | US4774703 Switching system for digital transmission network |
| 09/20/1988 | US4773083 In a communication system |
| 09/20/1988 | US4773081 Channel switching system |
| 09/20/1988 | CA1242250A1 Signal quality steered diversity |
| 09/14/1988 | CN85105744B 无线电接收机 Radio receiver |
| 09/13/1988 | US4771417 High speed modem |
| 09/13/1988 | US4771232 Non-interruptive spectrum analyzer for digital modems |
| 09/07/1988 | EP0281308A2 Decision-directed control circuit and method of adjusting decision-directed apparatus |
| 09/07/1988 | EP0281223A2 Secure messaging systems |
| 09/06/1988 | US4769807 Loop back control system |
| 09/06/1988 | CA1241777A1 Channel quality monitoring apparatus |
| 09/06/1988 | CA1241776A1 Device for performing wrap tests on a multiplex link in a data communication system |
| 09/01/1988 | DE3805582A1 Codier- und decodiereinrichtungen fuer kanaele mit partialcharakteristik Encoding and decoding equipment for channels with partialcharakteristik |
| 09/01/1988 | DE3705499A1 Monitoring the quality of a digital transmission path |
| 08/31/1988 | EP0280405A1 Method for distinguishing between successively arrived messages and a pager incorporating the method |