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| Number | Title | Issue Date |
| 4644525 | Line transmission systems In a telephone system in which digitally coded speech or data is transmitted in burst mode between a subscriber's set and the local exchange the bursts may be of the same length in either direction or longer in one direction than the other in dependence u... | 02/17/1987 |
| 4642632 | Digital paging system having bit rate switching means and digital paging receiver therefor A paging system in which an address code is transmitted at a lower transmission rate than message code and a discrimination code defines the boundary between the address and the message. The receiver includes a low pass filter with a cut-off frequency swi... | 02/10/1987 |
| 4630261 | Integrated buffer management and signaling technique In a private line multiplexing device a multi-priority buffering system is used to control the transmission of supervisory signaling information and normal messages onto an available communication channel. The system includes a multi-priority message buff... | 12/16/1986 |
| 4606044 | Adjusting data transmission rate based on received signal quality A data transmission control system for allowing remote transceiver stations to transmit data via a telephone line or like analog transmission line through modems. When transmit and receive stations have been interconnected by a call, a training sequence f... | 08/12/1986 |
| 4597074 | Multichannel interface linking a PCM line with a processor An interface interposed between a PCM data terminal and a processor comprises a bus accessor dialoguing with the processor, input and output circuitry coupled to the terminal, and intervening logic circuits and data stores designed to supply the processor... | 06/24/1986 |
| 4594707 | High speed limited distance multiplexed data communications modem using a single twisted pair of conductors A multiplexed data communications modem providing high speed data communication via a single twisted pair of conductors having a distance up to two kilometers between a plurality of data terminals and remote communications equipment is provided. A burst m... | 06/10/1986 |
| 4574166 | Tandem adaptive filter arrangement An extended impulse response characteristic is obtained by connecting a plurality of adaptive echo cancelers in a tandem connection (FIG. 1 or FIG. 2). Delay units (102) are associated with receive inputs (X) of the adaptive echo cancelers (101, FIG. 1, o... | 03/04/1986 |
| 4569062 | Interface circuit for interfacing between asynchronous data in start/stop format and synchronous data A data interface circuit for interfacing between an asynchronous data source providing data in start/stop format and a synchronous data communication channel is provided. The data interface circuit has a transmit portion and a receive portion which functi... | 02/04/1986 |
| 4555788 | Multiple rate baseband receiver The present invention consists of a multirate data receiver which will recover data at any of N data rates with no predetermined restrictions on the value of N. The data rate at which the receiver operates is selected by a single 1-of-N switch selection. ... | 11/26/1985 |
| 4547877 | System for switching multirate digitized voice and data A system for efficiently switching time multiplexed digital signals of different bit rates. A switch is described including switch modules each of which can switch data and/or voice 56 kilobit/second (kb) full-rate channels and 2.4 kb, 4.8 kb, and 9.6 kb ... | 10/15/1985 |
| 4539679 | Synchronization in a communication network of interconnected rings In a network of communication rings (R1 . . . R7, BB) interconnected by bridges (B1 . . . B4), access to each ring is regulated by a circulating token which is normally issued at irregular intervals depending on occurrence and length of messages. To enabl... | 09/03/1985 |
| 4525830 | Advanced network processor An advanced network processor or concentrator which uses distributed processing to interface a plurality of subscriber data input lines to a packet network. The concentrator includes removable line terminators boards (ULT) which can be configured to handl... | 06/25/1985 |
| 4519083 | Bilateral digital data transmission system A digital data transmission system for transmitting digital data from digital data handling hardware over a transmission line by analog signal representation and for receiving analog signal representation for reception of digital signals by the digital da... | 05/21/1985 |
| 4517670 | Preemptive bid communication system In a bus communication system, a unidirectional transmit bus is coupled to a unidirectional receive bus such that information packets leaving the transmit bus are placed on the receive bus. A plurality of bus interface units (BIUs) are coupled in series a... | 05/14/1985 |
| 4516241 | Bit compression coding with embedded signaling A bit compression coding circuit incorporates signaling bit insertion. An input signal sample(s) representing, for example, PCM encoded speech or voiceband data, is delivered to a difference circuit (31) where a predicted signal (se) is subtrac... | 05/07/1985 |
| 4510596 | Time slot assignment facilities A PCM switching system requires the assignment of either one or two time slots of a pair of time slots to a port circuit depending upon the type of service (voice only or voice plus data) each port circuit provides. Common resources normally assign a pair... | 04/09/1985 |
| 4510599 | Prioritized unidirectional distributed bus accessing system A plurality of bus interface units (BIUs), capable of placing information packets on a unidirectional transmit bus, are coupled to the transmit bus at locations spaced therealong. Each BIU comprises a transmit bus input port and a transmit bus output port... | 04/09/1985 |
| 4509167 | Data conference arrangement An arrangement for conferencing a plurality of data terminals via a data conference bridge. The bridge includes apparatus for negotiating a common set of communication parameters when data terminals having differing capabilities are connected to the same ... | 04/02/1985 |
| 4509164 | Microprocessor based digital to digital converting dataset A microprocessor based, digital to digital converting, full duplex time division multiplexing data set operating in burst mode transmission interfaces a data terminal to a communication path for communicating with another data terminal. The data set inclu... | 04/02/1985 |
| 4490819 | Rate converter A line switch for a digital telephone switching system utilizes distributed processing. The line switch comprises one or more switch modules. Each switch module is coupled to a central office switching system via one or more PCM lines which utilize common... | 12/25/1984 |
| 4479142 | Interface apparatus and method for asynchronous encoding of digital television Digitally encoded (DPCM) NTSC video is transmitted in a standard T3 data format and rate via a transmit interface module. The module is subjected to inputs comprising DPCM encoded NTSC video, horizontal sync and a video sampling clock at 3fsc, ... | 10/23/1984 |
| 4479123 | Automatic Calling Unit control system In a data communications system where a plurality of line adapters connect to remote peripheral units there is provided a control system for controlling selected Automatic Calling Units which can dial connection lines to remote peripherals or systems. A m... | 10/23/1984 |
| 4404557 | Timed token ring with multiple priorities A timed token protocol for use in a local area loop communications network is disclosed. The protocol provides three classes of service with a priority relationship between classes. The three classes allow guaranteed bandwidth, interactive and batch servi... | 09/13/1983 |
| 4389544 | Digital telephone apparatus Digital telephone apparatus suitable for use as a subscriber station as well as for an attendant console. The telephone apparatus is connectable for full duplex communication with a four wire telephone transmission line. The telephone apparatus is capable... | 06/21/1983 |
| 4383312 | Multiplex system tester An apparatus for testing a data multiplex transmission system by providing simulated source and sink of data for the multiplex transmission system that is compatible with the multiplex system and complies with the protocol of the Input/Output modules of t... | 05/10/1983 |
| 4357700 | Adaptive error encoding in multiple access systems In a time division multiple access (TDMA) system, for "multi-path" data communication via satellite repeater, the form of transmitted data is varied adaptively to maintain error-free transmission under varying noise conditions. Adjustments are made on a p... | 11/02/1982 |
| 4354261 | Circuit arrangement and method for multi-address switching operations A circuit arrangement for multi-address switching operations of digital encoded signals between a calling data terminal and a variety of called data terminals operating with different data transmission procedures is adapted for use with an electronic data... | 10/12/1982 |
| 4320526 | Adaptive phase-jitter tracker An adaptive phase-jitter compensator, which is frequency selective, is disclosed for use in data receivers. The filter section (28) of the adaptive compensator receives a derived phase error signal and its own weighted sum output to provide the difference... | 03/16/1982 |
| 4320520 | Transmitter/receiver for use on common cable communications system such as ethernet An improved transmitter/receiver for use on a common cable communications system which permits sending and receiving of data at multiple data rates. Each transmitter first transmits a message alerting the intended receiver. The message also informs the re... | 03/16/1982 |
| 4317195 | Method of and device for reducing speech-reproduction irregularities in packet-switching telecommunication systems Two mutually independent clocks at a transmitting node and a receiving node of a routing network in a packet-switching telephone system are correlated by a synchronizing device associated with the receiving node whose processor, at the beginning of voice ... | 02/23/1982 |
| 4276641 | Method and apparatus for converting time-division data signals received on an incoming trunk to time-division data signals of different format for transmission over an outgoing trunk Methods and apparatus for converting time-division data signals received over an incoming trunk having ve channels into time-division data signals for transmission over an outgoing trunk having vs channels (where vs >v | 06/30/1981 |
| 4276640 | Noise tolerant multiplex system A noise tolerant time division multiplex system including a transmitter and receiver, each constructed as a monolithic integrated circuit and interconnected by a serial data wire. Data as well as power is supplied to the transmitter from a plurality of pa... | 06/30/1981 |
| 4259740 | Sequential detection system In a communication system, a signal detection and acquisition system, which is capable of locating and phase-locking onto a narrow-band signal in a large frequency uncertainty region in a short period of time, employs the following series of operations: (... | 03/31/1981 |
| 4258433 | Digital data communication network having differing data transmission rate capabilities The invention relates to method of interconnecting terminal devices in a digital telephone network wherein either the terminal devices in question normally operate at different data rates or they are to be interconnected over data links in the network whi... | 03/24/1981 |
| 4229623 | Receiving means for use in a high speed, low noise digital data communication system Receiving means for use in a serial type data transmission system employing a plurality of coaxial lines. Digital data is transmitted to the receiving means in a manner such that one coaxial line contains data comprised of messages interposed with message... | 10/21/1980 |
| 4225752 | High speed, low noise digital data communication system A serial-type data transmission channel employing a transmitter and a receiver and a plurality of coaxial cables interconnected therebetween with optical coupling being provided at the receiver. One of the coaxial cables is used to transmit data comprised... | 09/30/1980 |
| 4147894 | Time division multiplex communication device comprising a switching matrix between C/E buffers and control circuits Like a conventional time division multiplex communication device, a device according to this invention comprises first terminals, a switching matrix, transducers or C/E buffers, control circuits, and second terminals. The first and second terminals are fo... | 04/03/1979 |
| 4129751 | PCM data throttle A data throttling arrangement is advantageously incorporated in a pulse width modulated (PWM) to pulse code modulated (PCM) signal converter for controlling the output rate of the PCM data stream. PWM data is converted to PCM data and stored in a memory. ... | 12/12/1978 |
| 4112412 | Digital seismic telemetry system A digital seismic telemetry system for recording seismic data from a plurality of seismic signal detectors positioned at selected detector stations. The system includes a plurality of remote units, each of which is positioned at a distinct detector statio... | 09/05/1978 |
| 4100377 | Packet transmission of speech A multiplex transmission system is disclosed in which speech activity is detected as a sequence of talkspurts and intervening silent intervals. The speech information is encoded and accumulated in a buffer store by omitting the silent intervals. A time st... | 07/11/1978 |
