Patents
Sitemap › H04 - Electric communication technique › H04L - Transmission of digital information, e.g. telegraphic communication › H04L 29 - Arrangements, apparatus, circuits or systems, not covered by a single one of groups
Patents for H04L 29 - Arrangements, apparatus, circuits or systems, not covered by a single one of groups (330,333)
12/1981
12/23/1981EP0042329A1 Interface for passing from a digital PCM transmission connection to a packet-mode transmission connection, and switching operator comprising such an interface
12/22/1981CA1114942A1 Bidirectional telewriting system operating in an alternating mode over a single carrier
12/16/1981EP0041895A1 Method and device for the transmission of digital data packets
12/10/1981WO1981003559A1 Voiceband data set
11/1981
11/10/1981US4300169 Facsimile operation method
11/10/1981CA1112347A1 Access module
11/04/1981EP0039191A2 Digital data transmission system with adaptive data transmission rate
11/03/1981US4298978 Data communication apparatus
10/1981
10/20/1981US4296439 Digital signal control system in a facsimile communication
10/13/1981CA1110774A1 Partial byte receive apparatus for digital communication systems
10/07/1981EP0036864A1 Data communications controller.
08/1981
08/19/1981EP0033821A2 Intelligent interfacing apparatus for the automatic management of a switched or dedicated telecommunication line
08/12/1981EP0033591A1 Improvements in or relating to data transmission systems
08/05/1981EP0033014A1 System for enciphering and deciphering data
07/1981
07/28/1981US4281315 Collection of messages from data terminals using different protocols and formats
07/28/1981CA1106073A1 Communications processor architecture
07/21/1981CA1105585A1 Programmable controller with modular firmware for communication control
07/14/1981US4279033 Bidirectional transmission circuit for interlocked signals
07/09/1981WO1981001933A1 Message format for secure communication over data links
07/01/1981EP0030978A1 Data-transfer controlling system
06/1981
06/30/1981US4276656 Apparatus and method for replacement of a parallel, computer-to-peripheral wire link with a serial optical link
06/30/1981CA1104227A1 Remote card operated terminal extensor circuitry
06/30/1981CA1104225A1 Microcomputer for materials handling system
06/16/1981US4274139 Digital telecommunication network having improved data processing systems
06/11/1981WO1981001622A1 Microprocessor device for exchange of data
06/09/1981US4272813 Communicating typewriter and dictation system utilizing analog recording and transmission techniques
06/02/1981US4271514 Loopback test for data transmission paths
06/02/1981US4271513 Method and apparatus for carrying out loopback test
06/02/1981CA1102421A1 Security controlled information exchange system
05/1981
05/19/1981CA1101517A1 Method and an arrangement in a teleprinter equipment
05/06/1981EP0027851A1 System for controlling the duration of the time interval between data blocks in a computer-to-computer transmission system
04/1981
04/28/1981US4264782 Method and apparatus for transaction and identity verification
04/21/1981US4263673 Receive buffer for converting synchronous-to-asynchronous data
04/16/1981WO1981001064A1 Improvements in or relating to data communications
04/07/1981US4261035 Broadband high level data link communication line adapter
04/07/1981US4261033 Communications processor employing line-dedicated memory tables for supervising data transfers
03/1981
03/25/1981EP0025753A1 Interface for passing to a packet-mode transmission connection from a digital transmission connection of another mode
03/24/1981CA1098215A1 Clockless serial data transfer
03/11/1981EP0024940A2 Method and apparatus for transmission of serial data
03/10/1981US4255748 Bus fault detector
03/03/1981US4254499 Signal transmission system in a digital controller system
02/1981
02/03/1981CA1095193A1 Multiplexing
01/1981
01/27/1981US4247941 Simulator for bit and byte synchronized data network
01/27/1981US4247934 Testing system for data transmission paths
01/08/1981WO1981000025A1 Information-transfer control system
01/07/1981EP0021917A1 Terminal concentrator for a data packet transmission and switching network
01/07/1981EP0021544A1 System for the remote testing of a modem for a speed of transmission different from the speed of reception
01/07/1981EP0021401A1 A method and apparatus for transaction and identity verification
01/07/1981EP0021145A1 Message multiplexing arrangement in a digital data communication system
12/1980
12/02/1980US4237352 Patch module for connecting to off-line transmission lines of a switchably selected pair of transmission lines
10/1980
10/29/1980EP0017715A2 Processing, recording and transmitting system for key-board entered data
10/21/1980CA1088234A1 Test circuit for a protective coupler
10/21/1980CA1088176A1 Programmable communications subsystem
10/07/1980CA1087313A1 Banking system
10/07/1980CA1087258A1 Circuit for wire transmission of high frequency data communication pulse signals
09/1980
09/17/1980EP0015730A1 A data transmission system, and a method of passing data through a data transmission system
08/1980
08/20/1980EP0014592A2 Bus fault detector
08/20/1980EP0014505A1 Device testing system provided with an echo suppressor
08/19/1980US4218742 System for controlling a serial data channel with a microprocessor
08/05/1980CA1083273A1 Data transmission system
07/1980
07/29/1980CA1082787A1 Method and apparatus for signaling in a communication system
07/22/1980US4214123 Bidirectional telewriting system operating in an alternating mode over a single carrier
06/1980
06/25/1980EP0012509A1 Function coding system via digital addresses in a communication system
06/03/1980CA1078947A1 Packet switching system
05/1980
05/27/1980US4205200 Digital communications system utilizing controllable field size
05/27/1980CA1078525A1 Data stores and data storage system
05/13/1980US4203066 Access module
04/1980
04/08/1980CA1075361A1 Data transmission, particularly with delta modulation
03/1980
03/19/1980EP0008608A1 Circuit arrangement for carrying out a loop test for data transmission lines
03/11/1980US4193061 Electronic authentication system
02/1980
02/12/1980US4188665 Programmable communications subsystem
02/05/1980US4187438 Circuit arrangement for unilaterally scanning distorted teletype characters
01/1980
01/29/1980US4186379 High-speed data transfer apparatus
01/09/1980EP0006471A1 Disk file controller
01/09/1980EP0006325A1 Data transmission system for interconnecting a plurality of data processing terminals
01/09/1980EP0006216A1 Improvements in digital data processing systems
01/01/1980US4181909 Method and appratus for initializing remote data communication equipment
12/1979
12/11/1979CA1068007A1 Automatic terminal data rate selection
12/04/1979CA1067632A1 Call progress signal detector
11/1979
11/06/1979US4173790 Communication control system
10/1979
10/02/1979CA1063704A1 Closed user group facility
09/1979
09/25/1979CA1063269A1 Data transmission systems
09/18/1979US4168469 Digital data communication adapter
09/04/1979CA1061912A1 Data transmission system
08/1979
08/21/1979CA1061002A1 Method for communicating text commands and instructions using conventional coded text characters and a structure for decoding and presenting command and instruction signals
07/1979
07/24/1979US4162487 System for the transmission and reception of encoded information
07/17/1979US4161719 System for controlling synchronization in a digital communication system
07/17/1979CA1058765A1 Data gathering, formatting and transmitting system having portable data collecting device
07/10/1979US4160877 Multiplexing of bytes of non-uniform length with end of time slot indicator
06/1979
06/26/1979US4159468 Communications line authentication device
06/13/1979EP0002266A1 A digital patch and access assembly comprising at least one digital patch and access module and a monitoring plug
05/1979
05/29/1979US4156932 Programmable communications controller
05/29/1979US4156796 Programmable data processing communications multiplexer
05/15/1979CA1054721A1 In band signalling
03/1979
03/13/1979US4144584 Remote card operated terminal extensor circuitry
03/06/1979US4143239 Signal distortion correction circuit in teleprinter equipment
11/1978
11/21/1978US4126764 Partial byte receive apparatus for digital communication systems
10/1978
10/24/1978US4122300 Data transmission system and application thereof to the transmission of analog signals and of data in a network with delta modulation
09/1978
09/12/1978US4114139 Security controlled information exchange system
08/1978
08/29/1978US4110558 Data transmission system
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