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| Number | Title | Issue Date |
| 4887278 | Equalizer for digital transmission systems A post-equalizer and pre-equalizer circuit for use in communicating between nodes in a pulse amplitude modulated digital communication system is described. The post-equalizer circuit comprises a first variable zero circuit, a second variable circuit, and ... | 12/12/1989 |
| 4881244 | Transmission-reception equipment for a bus system Transmission-reception equipment for a bus system guarantees a reliable response of all bus receivers in a bus system preferably constructed with a shielded twisted-pair cable and having a greater length and/or higher bit rate than prior art systems. The ... | 11/14/1989 |
| 4875205 | Crosstalk reduction in unshielded twisted-pair lines A method of reducing crosstalk in unshielded twisted-pair (TP) lines interconnecting transceiver Hub and Pod elements of an IEEE 802.3 network is disclosed. Each element is connected by a four-wire full-duplex pair of unshielded TP wires which are prone t... | 10/17/1989 |
| 4866737 | High speed voiceband data transmission and reception ASCII characters are coded in the form of 8, 16 or longer digital words. Signal pulses with durations proportional to such digital words are generated and filtered so that the filtered signal has substantially the same duration as the unfiltered signal. T... | 09/12/1989 |
| 4837780 | Transmit line buildout circuits A characteristic of a signal received via a receive line is monitored and used for automatic control of a line buildout circuit in a transmit signal path. The characteristic is conveniently an amplitude level, or differential amplitude levels for differen... | 06/06/1989 |
| 4815105 | Selective signalling encoder/decoder for multipoint data communication networks A selective secondary signalling encoder/decoder for multipoint data communications networks for use on transmission media such as telephone lines provides for selective signalling between a master broadcasting unit and however many slave units are in the... | 03/21/1989 |
| 4807249 | Circuit arrangement for serial data transmission between a plurality of subscriber stations A circuit arrangement is provided for serial data transmission between a plurality of subscriber stations via a data bus, the circuit arrangement comprising data transmitters that are in a high-impedance state in the passive condition and in a low-impedan... | 02/21/1989 |
| 4797904 | Transmitter for ISDN S-bus interface circuit In the future ISDN network, up to eight subscriber terminals for speech, data and image traffic can be connected to the network terminating circuit (NT). The interface between the subscriber terminals and the network terminating circuit - the S-interface ... | 01/10/1989 |
| 4797899 | Integrated dual charge pump power supply including power down feature and rs-232 transmitter/receiver A monolithic integrated circuit containing an inverting/non-inverting voltage doubler charge pump circuit is disclosed for converting a unipolar supply voltage to a bipolar supply voltage of a greater magnitude. The unipolar input voltage is placed across... | 01/10/1989 |
| 4797898 | Method and apparatus for equalization of data transmission system A data communication system, comprising a first and a second transceiver coupled together through a transmission channel, the transmission channel having transmission characteristics. A measurement circuit is coupled to the first transceiver for measuring... | 01/10/1989 |
| 4785465 | Circuit arrangement for serial data transmission between a plurality of subscriber stations A circuit arrangement is provided for serial data transmission between a plurality of subscriber stations via a loaded data bus and having transmitters that are in a high-impedance state in the passive condition and in a low-impedance state in the active ... | 11/15/1988 |
| 4782300 | Differential transceiver with line integrity detection A differential transceiver transmission line integrity detector detects both open and short circuits in the transmission lines. The two transmission lines are terminated at both ends by selected impedances. A driver coupled to each of the transmission lin... | 11/01/1988 |
| 4780883 | Data modem with adaptive synchronized speed change A method for changing the data transmission rates in a synchronous data communication system including a first modem and a second modem coupled together through a transmission channel, the transmission channel including a first path for transmissions from... | 10/25/1988 |
| 4775864 | Local area network with multiple node bus topology In a local area network, a plurality of nodes are connected to a single port of a hub through a length of cable and a corresponding plurality of transceivers attached to the cable, each of the transceivers having an output impedance significantly greater ... | 10/04/1988 |
| 4771335 | Method and apparatus for sending data A communication system which includes two digital terminal stations connected to each other by a digital communication line. The communication system includes data terminals adapted for operation on an analog communication line which transmits main data a... | 09/13/1988 |
| 4761647 | Eprom controlled tri-port transceiver A tri-port transceiver for receiving, switching and transmitting digital information among its ports. An input to each port is coupled to a multiplexer of each other port, wherein the multiplexer of each other port, wherein the multiplexers provide the sw... | 08/02/1988 |
| 4756006 | Bus transceiver A data signal appearing at an input node of a bus transceiver is transmitted to an output node thereof during a clock cycle. During a second phase of the clock cycle, the data signal is captured in a latch of the transceiver and continues to be transmitte... | 07/05/1988 |
| 4754477 | Key telephone system There is disclosed a data transmitting and receiving circuit extremely advantageous when applied to a key telephone system. The data transmitting circuit comprises a voltage dividing circuit for dividing a power supply voltage to apply the divided voltage... | 06/28/1988 |
| 4746897 | Apparatus for transmitting and receiving a power line A transceiver provides a relatively constant output voltage from its linear amplifier by providing both current and voltage feedback to its operational amplifier. The present invention utilizes common components for both transmitting and receiving and pro... | 05/24/1988 |
| 4744092 | Transparent error detection in half duplex modems A modem is operated in a half-duplex mode having various elements which are trained on data and which are locked up while data is not exchanged, thereby eliminating the need for a preamble. A preamble is used if the period between successive transmissions... | 05/10/1988 |
| 4744097 | Data transmission system A data transmission system includes a data transmitter/receiver connected to an ECR and a data processor. The transmitter/receiver receives data from the ECR and transmits the reception data to the data processor, and includes a storage means for storing ... | 05/10/1988 |
| 4740992 | Peer relationship transceiver A transceiver is adapted for communication with another transceiver over a common channel by a technique that allows both transceivers to be identical in manufacture and use. The technique avoids designating one transceiver the "master" and the other the ... | 04/26/1988 |
| 4736385 | Transmitter and receiver circuit High frequency transmitter and receiver circuits are AC coupled for party line transmission over coaxial cable where the circuits are connectable to the cable by use of stinger taps and thereby eliminate the need to interrupt service when connecting the c... | 04/05/1988 |
| 4734919 | Circuit for serial data communication and power transmission A circuit for serial data communication and power transmission between a main controller and a sub-station along two balanced transmission lines. The circuit includes a power supply for providing a DC voltage to the sub-station along the transmission line... | 03/29/1988 |
| 4731820 | Data transmission system of key telephone system Disclosed is a system for transmitting data by a data pulse train obtained by a combination of "0" or "1" bit pulse signals through a pair of lines connected beween a main unit and a key telephone set. The system includes a counter for sampling the pulse ... | 03/15/1988 |
| 4713827 | Terminator for a cmos transceiver device A terminator for a transceiver device for transmitting data signals to and receiving data signals from a second transceiver device over a transmission line therebetween. The terminator has a transmitter connected to the transmission line for transmitting ... | 12/15/1987 |
| 4710943 | Starlan coded data transceiver collision detection circuit A daisy chain collision detection circuit for use with a StarLAN coded data transceiver includes a voltage comparator having an inverting input, a non-inverting input and an output. The inverting input of the voltage comparator is responsive to differenti... | 12/01/1987 |
| 4706081 | Method and apparatus for bridging local area networks A communications system interconnects local Area Networks (LAN's) across broadcast simplex channels. The LAN's are connected independently and transparently of protocols above the data link layer so that the system appears to the user at a station in one ... | 11/10/1987 |
| 4698800 | Bi-directional transceiver circuit A simultaneous bi-directional transceiver is described. The transceiver comprises two circuits which are disposed at opposite ends of an interchip cable. In response to the application of digital data signals to these circuits, they generate a trilevel vo... | 10/06/1987 |
| 4697047 | Trunk coupling unit A relay circuit comprise first and second relays having respective terminals at which positive cross-talk of a signal of positive polarity is produced when the other terminals to which the positive polarity signal is applied are in the make and break stat... | 09/29/1987 |
| 4697166 | Method and apparatus for coupling transceiver to power line carrier system A method and apparatus for efficiently coupling a transceiver to an AC power line transmission system. The preferred embodiment of the coupling system comprises a line coupling network and first and second filter ports. The first filter port is connected ... | 09/29/1987 |
| 4685113 | Driver isolating circuit for common bus-type transmission of local area network A driver in a transceiver for a common bus-type transmission system of a local area network includes a switching transistor for receiving a transmission data signal from a station and outputting a forward data signal to a bus, a diode for stopping data en... | 08/04/1987 |
| 4680787 | Portable radiotelephone vehicular converter and remote handset A portable radiotelephone is disclosed in which an associated logic unit communicates via a data bus with an internal keypad and display and a detachable external keypad and display. Capability is provided for detecting the presence of the external keypad... | 07/14/1987 |
| 4672658 | Spread spectrum wireless PBX The present invention relates to a wireless PBX network wherein direct sequence spread spectrum multiple access is used for voice and data communications to support a plurality of local-local and local-external calls. The present wireless PBX arrangement ... | 06/09/1987 |
| 4656643 | Line interface circuit A line interface circuit for connecting the transmit and receive ports of a transmitter to transmit lines (LX) and receive lines (LR), respectively. The interface circuit includes a transistorized differential amplifier provided with two load circuits com... | 04/07/1987 |
| 4649548 | Local computer network transceiver A local computer network transceiver is provided for a distributed control local computer network which applies a signal to a medium which has a DC component wherein isolation is implemented at the medium interface without need for direct current coupling... | 03/10/1987 |
| 4641263 | Controller system or emulating local parallel minicomputer/printer interface and transferring serial data to remote line printer A remote line printer system is used for printing on a line-by-line printer at a remote location. Data stored in a minicomputer and fed in parallel format from a print port. The minicomputer, which thinks it is driving a local printer, is connected to a m... | 02/03/1987 |
| 4637012 | Flexible duplex dual port serial link controller A multiple port serial link controller printed wiring card is shown. This printed wiring card provides at least two independent ports. These ports may be of different types such as RS-232 interface, RS-499 interface or other serial protocols such as HDLC,... | 01/13/1987 |
| 4637064 | Local area network equalization system and method A global network equalization system for equalizing all modem receivers and modem transmitters connected to a local area network. A calibration signal is injected over the local area network from a reference or common point and received by each of the rec... | 01/13/1987 |
| 4630284 | Low power line driving digital transmission system A low power line driving transmission apparatus is described in which TDM signals are transmitted between points over a transmission line comprising a pair of conductors and in which the characteristic impedance of the tranmission line and the source impe... | 12/16/1986 |
