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4250561 |
Apparatus for receiving and/or delivering signalling characters each having a plurality of polarity changes
A conversion structure is provided for converting polarity changes into digital characters and digital characters into polarity changes. The structure includes a conversion circuit which is...
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4248319 |
Circuit arrangement for connecting at least two teleprinters to a common connection line
An apparatus for connecting a selected one of two teleprinters to a common communication line includes a control unit associated with each teleprinter and an analysis circuit connected to both...
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4243836 |
Digital autostart circuit
A terminal unit having a digital autostart circuit for energizing an output device such as a teleprinter. The autostart circuit responds only to the space character which is transmitted between...
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4241802 |
Method and circuit arrangement for switching signals having different transmission speeds within a program-controlled data exchange system
Signals of different transmission speeds are switched within a program-controlled data exchange system. The exchange system has connection circuits and/or connection circuit groups which are...
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4203001 |
Apparatus for establishing multi-address and conference call connections
Apparatus for establishing multi-address and conference call connections in a switching system comprising line terminators associated with respective incoming and outgoing lines, comprises a...
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4191847 |
Circuit arrangement for determining input signals which exceed a given minimum duration, in particular for teleprinter exchanges
In order to determine input signals which exceed a given minimum duration, in particular call signals in teleprinter exchanges, upon occurrence of each input signal a counter for executing a...
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4166196 |
Electric direct current telegraphy transmitter
An electronic transmitter for direct current telegraphy by means of polar line currents has a switching circuit that selectively connects one of the two poles of a telegraphy battery through a...
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4156796 |
Programmable data processing communications multiplexer
A micro processor controlled user programmable communications multiplexer subsystem (herein referred to by the symbol PCS) capable of transmitting and receiving data on any one or more of 32...
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4156798 |
Small packet communication network
A highly efficient and modular communication network includes a small number of different exchange units including a network controller exchange unit, line master exchange units, line exchange...
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4122301 |
Selection of branch lines of multipoint junction circuits
A multipoint junction unit at a hub office interconnects a main line and a plurality of branch lines, the main line extending to a control station and the branch lines extending to data station...
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4121047 |
Circuit arrangement for the switching on and off of a teleprinter PBX exchange
A PBX exchange for teleprinters in which certain protected lines have the facility of direct connection to the main connection lines of the network, when the PBX exchange breaks down. Impermissible...
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4110555 |
Circuit arrangement for identification and addressing
To connect one out of a plurality of peripheral units to a data bus, each unit is connected to two wires of an address matrix. When a unit wants to connect itself to the data bus, it applies a...
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4100533 |
Multipoint polling technique
A multipoint polling system wherein a multipoint switch selectively connects a plurality of remote terminals to a central station in response to remote terminal addresses transmitted on a signaling...
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4095045 |
Method and apparatus for signaling in a communication system
A method and apparatus are disclosed for using a specified pattern of signal events for signaling in a digital communication system. Illustratively, detection of a first event in a control signal...
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4092489 |
Switching arrangement for monitoring polarity reversal on lines in telecommunication systems
Apparatus is described for monitoring the state, e.g., with regard to polarity, of signal lines in a telecommunication system. An input circuit, by means of high resistances relative to the line...
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4074232 |
Data sending and receiving system for packet switching network
A packet switching network in which the data transmitted from a data sending terminal is temporarily stored in a packet switching exchange connected to a data sender where the data is divided into...
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4069392 |
Dual speed full duplex data transmission
A dual-speed, dual format full-duplex two-wire voiceband data transmission system provides automatic speed selection at the answering terminal responsive to a handshaking sequence which is...
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4064360 |
High speed digital switch
A switching system for rapidly configuring transmission paths between comer equipments for high speed digital information in parallel form couples the input of a parallel-to-serial (P/S) converter...
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4058838 |
Packet-switched facsimile communications system
A packet-switched facsimile communication system operable in a store-and-forward mode is provided for enabling substantially simultaneous full-duplex communication between a plurality of...
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4052737 |
Method and apparatus utilizing Baudot code for categorizing and selectively distributing information to a plurality of utilization units
Disclosed is a method and apparatus for selectively distributing on a multiple channel television system information previously transmitted and received in the Baudot code. The transmitted...
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4049906 |
Message network for the transmission of digital telegrams with an address consisting of routing words
A general digital message network for short address-coded telegrams having plural switching stations. In each switching station the outputs of the input stores are each connected to one of the...
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4048441 |
Error control for digital multipoint circuits
A multipoint synchronous data network is formed by junction units which provide signal paths that interconnect incoming branch lines to a common outgoing branch. The junction units arranged to...
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4031375 |
Arrangement for fault diagnosis in the communication controller of a program controlled data switching system
Apparatus is described for monitoring and diagnosing faults in the communication controller of a line termination unit in a program controlled data switching system. Individual devices detect...
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4031314 |
Arrangement for connecting information transducers in program controlled processing systems
A circuit arrangement for connection of information transducers, which may be compensating networks in program controlled telecommunication exchange systems is described. In the system the transfer...
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4027098 |
Method for establishing conference connections in dial-operated telecommunication exchanges
A method for operating dial-operated telecommunication exchanges equipped with broadcast devices to make conference connections is described. Responsive to signals emitted from a calling...
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4000364 |
Regulated pulsed current telegraph adapter
A regulated current pulse is generated for use in transferring digital data from low level voltage devices to those requiring substantially high current such as teletypewriters. By utilizing low...
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4000371 |
Facsimile transmission method and system
Two facsimile devices, each capable of operating in a plurality of communication modes and having at least one common communication mode are connected together by a telephone line. One of the...
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3982061 |
Data transfer control apparatus
In a multi-device data transmission system with source and acceptor devices linked by a data highway and handshake lines, provision is made for automatically adjusting the delay of the handshake...
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3963867 |
Method for indicating a free-line state in a binary data communication system
A method for indicating the free-line state of a subscriber's line connected to a terminal exchange in a binary data communication system comprising generating and transmitting to the exchange a...
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3958088 |
Communications systems having a selective facsimile output
A switched communications system including store and forward facilities is provided in accordance with the teachings of the present invention wherein, in an exemplary embodiment, any of a plurality...
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3944723 |
Station for power line access data system
A central station is described which acts as an interface between a two-way communication system superimposed on a power distribution network and a data processing computer. Information from the...
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3936600 |
Keyboard-printer terminal interface for data processing
An asynchronous buffered interface for interconnecting a data processing apparatus adapted to communicate in serially coded ASCII data format and a terminal comprising a printer and a keyboard,...
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3934088 |
Data terminal for connection to telephone or teleprinter facilities
A data communication terminal with a single data communications means is selectively connected via a first data coupler to a dialed telephone facility or via a second data coupler to a teleprinter...
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3925600 |
Line switching system for digital data
A switching office for line switching digital data messages that accepts inband digital address signals and forms selective interconnections to interchange data between data lines and data trunks....
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3925601 |
Digital register sender and line circuit for data switch
A switching office for line switching digital data messages includes a digital register sender for accepting inband digital address signals that control the switch and for sending inband digital...
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3920896 |
Communications systems having a selective facsimile output
A switched communications system including store and forward facilities is provided in accordance with the teachings of the present invention wherein, in an exemplary embodiment, any of a plurality...
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3921138 |
Multipoint data communications systems utilizing multipoint switches
In a multipoint data communications system a multipoint switch responds to polling signals on a signaling path from a central station by extending the signaling path to a selected one of a...
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3916090 |
Intracommunication system for a communications terminal
A telecommunications terminal which is divided into at least two portions; specifically, a keyboard portion and a central portion with a display and a memory, in which the depression of a key on...
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3909511 |
Arrangement for the identification of requests in program-controlled data switching systems
A program controlled data switching system wherein the connection circuits include storage devices and gate switching elements; the transfer of items of information occurring on the lines into the...
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3906151 |
Method and apparatus of signal conversion in program-controlled automatic data exchanges
A method and apparatus for converting characters in a program-controlled data exchange installation is described. The exchange installation includes at least one common storage unit storing data...
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3890488 |
Digital print and punch tape recorder having read-write memory
A digital recorder for simultaneously printing and punching digital data, such as vehicle traffic information, on the same tape is described. The recorder employs an electronic read-write memory...
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3867567 |
Electronic data terminal interface
An interface circuit for use between a data terminal and a data system for providing level shifting and isolation and having a receive channel that is powered by the same power supply as the...
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3859456 |
SYSTEM FOR ANALYZING AND STORING TELEGRAPH CHARACTERS RECEIVED ON SEVERAL LINES
A character block or logic circuitry is disposed between the line unit receiving telegraph characters on several lines and a central processing unit of a telegraph switching center. The character...
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3846703 |
NOISE CONTROL SYSTEM FOR TRANSMISSION NETWORK
Disclosed is a noise control system especially useful in branching or fan-out type transmission networks which include a primary trunk cable and a plurality of feeder cables branching therefrom at...
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3823256 |
DATA SWITCHING SYSTEM
A description is given of a data switching system for switching direct connections between TELEX lines by way of a central processor. The system configuration of a message switching system is used...
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3794759 |
MULTI-TERMINAL COMMUNICATION APPARATUS CONTROLLER
A multi-terminal communication apparatus controller is provided which allows information signals on a transmission medium to be replaced with new information signals at each terminal. Branch...
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3783183 |
ARRANGEMENT FOR THE CONNECTING OF TRANSMISSION DEVICES TO A PROGRAM CONTROLLED ELECTRONIC DATA EXCHANGE SYSTEM
A circuit arrangement is described for transmitting binary signals at high speeds between data signal transmission devices and system connections of a program controlled data exchange, even though...
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3775754 |
DIAL-OPERATED DATA EXCHANGE SYSTEM
A data exchange system of the dial-operated type having a central store to contain the operating relationships between the feeders and trunks of the system, and in which exchange functions are...
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3773970 |
TELEPRINTER SUBSCRIBER STATION APPARATUS FOR SINGLE CURRENT OPERATION WITH BACK POTENTIAL AT THE SUBSCRIBER STATION
In teleprinter subscriber station circuitry functioning according to the single current principle an auxiliary current source is described whereby a back potential is generated. The auxiliary...
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3740721 |
DATA CONVERSION AND RECORDING APPARATUS
A data conversion and recording apparatus is provided wherein data in either decimal or binary form may be received and converted into a selected code before being recorded. An encoding means in...
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