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| Number | Title | Issue Date |
| 4627073 | Binary data transmission method A process for transmitting a stream of digital data over a high impedance metallic pair transmission line under high loss conditions is disclosed. This process involves first converting the digital data into a stream of binary code. The first element of t... | 12/02/1986 |
| 4620187 | Transformer coupled, solid state communications line switch A plurality of signal coupling transformers and a plurality of solid state switches are used to insert and/or de-insert data terminal equipment (DTE) from a communications network. The solid state switches are controlled to short the output of selected tr... | 10/28/1986 |
| 4615039 | Data network driver An improved driver for differentially driving a differentially conducting cable (e.g., for Ethernet) minimizes the output offset signal coupled to the cable when the driver is idle. When driven to an idle state, the driver provides a shaped output which t... | 09/30/1986 |
| 4606046 | Converter/line driver circuit for a line repeater A converter circuit receives N-rail logic signals and converts them into a precision N-level signal. A pair of line drivers is connected in a balanced output arrangement with the primary winding of an output transformer. In response to the N-rail logic si... | 08/12/1986 |
| 4528677 | Data transmission system A data transmission system including a pair of parallel transmission lines, applies data signals to the transmission lines through a transformer and an associated impedance connected across the lines. The transformer is magnetically coupled to at least on... | 07/09/1985 |
| 4516245 | Digital span transmission circuit In a telecommunications switching system, a thick film digital span transmission circuit is connected between a digital span and a switching network of the switching system. The circuit converts unipolar switching network data to bipolar data for digital ... | 05/07/1985 |
| 4504959 | Noise-neutralizing digital interface circuit The invention facilitates the reception of bus-transmitted digital signals in the presence of electrical noise and includes a transmitter adapted to be coupled to a two wire communication bus. The transmitter has a controllable transistor for switching on... | 03/12/1985 |
| 4481641 | Coaxial cable tap coupler for a data transceiver A coaxial cable coupler that provides a low impedance through conductor for a passive coaxial transmission cable and a high impedance tap to periodic transmission means and receiver means. The tap connection is a removable connection that is formed by a r... | 11/06/1984 |
| 4475209 | Regenerator for an intrabundle power-line communication system A regenerator for providing detection, remodulation, and retransmission of a digital data signal propagated in the differential mode over a pair of bundle conductors of a power line. The electric power signal, propagated in the common mode over the same b... | 10/02/1984 |
| 4464765 | Burst signal transmission system In a multi-level transmission system, a binary digital signal is converted into a multi-level signal by generating successive multi-level symbols each having a polarity opposite the polarity of the average DC level of preceding symbols, with the first sym... | 08/07/1984 |
| 4445222 | Coupling circuit for transferring data signals at a high rate A coupling circuit for transferring data from a data transmitter to a bus common to several transmitters, each data transmitter being galvanically separated from the bus. The coupling circuit has a signal separator and a switch connected in series between... | 04/24/1984 |
| 4398178 | Apparatus for transmitting information on an alternating current line In a system for transmitting information on an a.c. line from a transmitter unit to a receiver unit which is connected to the line at a great distance from the a.c. source supplying said line than the transmitter unit, information is transmitted on one of... | 08/09/1983 |
| 4388716 | Two-way transmission system A two-way transmission system including a master station coupled to a transmitting end of a transmission line and a sub station coupled to the receiving end of the transmission line. A pulse transformer is provided between the transmission line and at lea... | 06/14/1983 |
| 4384356 | Wide band modem for high speed data transmission A method and apparatus are described for coupling a high-speed data communication modem to a communication line such as a coaxial cable with minimal transmission losses when the modem is not transmitting data. The transmitter coupling apparatus comprises ... | 05/17/1983 |
| 4380060 | Device for push-pull transmission The invention relates to a device for push-pull transmission of items of binary information, wherein in order to improve the ratio of the information which can be simultaneously transmitted to the number of lines in a line group comprising at least three ... | 04/12/1983 |
| 4337465 | Line driver circuit for a local area contention network This disclosure relates to a line driver circuit for a station in a data transmission network, which driver circuit is adapted to drive the channel medium with a constant current so that conflicts or collisions with data transmissions from other stations ... | 06/29/1982 |
| 4317219 | Mobile radio system A radio system for communications transmission between transmitting/receiving stations moving along prescribed routes and stationary transmitting/receiving stations arranged along these routes at prescribed intervals and effective in both route directions... | 02/23/1982 |
| 4270214 | High impedance tap for tapped bus transmission systems An electrically and mechanically modular design of a high impedance, passive tap is disclosed for use in distributed, serial transmission systems to provide a tap connection to the primary transmission line with minimum loading and reflection. The tap is ... | 05/26/1981 |
| 4254501 | High impedance, Manchester (3 state) to TTL (2 wire, 2 state) transceiver for tapped bus transmission systems An electrically and mechanically modular design of a high impedance, passive transceiver is disclosed for use in distributed, serial transmission systems to provide half uplex interfacing to multiple users with minimum loading and reflection. The transcei... | 03/03/1981 |
| 4188619 | Transformer arrangement for coupling a communication signal to a three-phase power line A communication signal is coupled simultaneously to all three phases of a neutral-wye three-phase power line through a transformer arrangement consisting of a low voltage set of three serially connected windings across which the signal is applied to produ... | 02/12/1980 |
| 4153848 | Receiver circuit A receiver circuit for receiving a double current pulse signal from a transmission line and delivering positive pulse or a negative pulse corresponding to that of the double current pulse signal in a discriminating manner. The circuit comprises an input t... | 05/08/1979 |
| 4149030 | Multi-drop communications device A digital data modem arrangement is disclosed for use in a multi-drop communication system using either telephone lines or a pair of conductors. The communications device connected to a communications channel is readily adapted to a voice grade telephone ... | 04/10/1979 |
| 4121118 | Bipolar signal generating apparatus A bipolar signal generating apparatus for generating a bipolar signal having positive and negative polarities and comprising a switch means for connecting two terminals of a primary winding of a transformer with each other when the bipolar signal has a le... | 10/17/1978 |
| 4110711 | Voice/data receiver coupled with a transmission line through an input transformer working into an impedance approaching a short circuit A transmission line having a fixed characteristic impedance, e.g., 600 ohms, is coupled to a receiver through an input transformer working into a very small impedance, e.g., 10 ohms or less. As compared to a conventional arrangement, where an input transf... | 08/29/1978 |
| 4090154 | Matching arrangement for converting bi-directional signals into binary signals A matching network for distributing high frequency bi-directional signals transmitted along a coaxial transmission line includes a transformer and an active filter having a second order transfer function for coupling a transmitter or a receiver to the tra... | 05/16/1978 |
| 4021685 | Pulse circuit for reshaping long line pulses A pulse circuit for reshaping pulses received over a long line includes a transformer having a primary winding connected to the line and a center-tapped secondary winding. The transformer and the line are together arranged to have a time constant which is... | 05/03/1977 |
| 4012733 | Distribution power line communication system including a messenger wire communications link A distribution power line communication system wherein communication signals are transferred between a communication terminal at a substation and communication terminals at customer locations. The communication signals are transferred between the terminal... | 03/15/1977 |
| 4008467 | Power line carrier communication system having efficient carrier signal coupling of distribution secondary lines An arrangement of components for a distribution line communication system. Two or more independent secondary distribution lines are connected, through distribution transformers, to a primary distribution line. Carrier communication signals are transferred... | 02/15/1977 |
| 3993953 | Apparatus and method for digitally generating a modified duobinary signal A binary signal is first digitally transformed to obtain both an altered binary signal and its complement. The altered and altered complementary signals are next each delayed by two bit intervals of the original waveform to obtain both delayed altered and... | 11/23/1976 |
| 3980826 | Means of predistorting digital signals A method and means for transmitting a waveform of mixed frequency content over a transmission line in a way to minimize distortion are disclosed. The specific application relates to a bifrequency or biphase encoded binary data transmission system. Distort... | 09/14/1976 |
| 3973240 | Power line access data system A two-way communication system is disclosed utilizing power transmission lines as the transmission medium. The system is a multilevel repeater system in which each repeater has a unique address. The lowest level repeaters poll the terminal stations connec... | 08/03/1976 |
| 3936602 | Full duplex data transmission system using two speeds of diphase signal for simplified sync In a telephone system supervision is provided for, between a local terminal typically associated with a telephone switching facility and a remote key telephone terminal. A data link between the terminals includes a two wire transmission line terminated wi... | 02/03/1976 |
