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| Number | Title | Issue Date |
| 4638480 | Distributed digital signal multiplexing An arrangement for digital multiplexing onto a common highway a plurality of analogue input signals which are physically spaced apart over a distance. m time division multiplexing units 5a each have for each of n separate analogue signals n single channel... | 01/20/1987 |
| 4635255 | Digital subscriber controller A digital subscriber controller having a number of analog ports and digital ports which can be programmed via an external microprocessor to establish time-division multiplexed bidirectional data paths between three subscriber-selected ports designated as ... | 01/06/1987 |
| 4607364 | Multimode data communication system A data transmission system that can controllably transmit data in three different modes between connected data devices. The first mode transmits data at a 64 Kbps rate. The second mode transmits data at a 56 Kbps rate plus control signals at an 8 Kbps rat... | 08/19/1986 |
| 4593389 | Simultaneous voice and asynchronous data telephone A telephone which can receive and transmit voice and asynchronous data simultaneously is provided. A signalling circuit provides signals indicating the request for a communication link or requesting a communication link to a predetermined location. A tran... | 06/03/1986 |
| 4592047 | Circuit for the subscriber termination in an integrated services digital network A circuit for the subscriber termination in an integrated services digital network (ISDN) to which a number of individual terminals are connected by means of S-interfaces, or by S-interface busses respectively connected in a number of terminals into a com... | 05/27/1986 |
| 4592049 | Method of and arrangement for controlling access to a time-division multiplex message transmission path Method the transmission of data packets in a TDM transmission loop wherein the frame is subdivided into several groups each having the same number of words, and each group comprises either exclusively narrow-band channels for the transmission of speech da... | 05/27/1986 |
| 4553235 | Apparatus for connecting digital terminals to a digital exchange An apparatus is provided in a digital communication system for connecting digital terminals to a terminal junction point which in turn is in communication with a digital exchange. The terminal junction point contains directing means (9) for sending, in a ... | 11/12/1985 |
| 4512016 | Digital communication station signaling control There is disclosed a processor controlled digital communication device which accepts message commands from a communication system as part of a communication protocol. These command messages are stripped from the protocol and combined within the communicat... | 04/16/1985 |
| 4512017 | Digital dual channel communication terminal There is disclosed a digital telephone having dual voice and data handling capability over a single communication line. Time separated information channels are used to transport the voice and data information between the terminal and the main processor. A... | 04/16/1985 |
| 4437182 | Method and apparatus for interleaving control signals A method and apparatus are described for ensuring that control signals from every data channel are transmitted periodically regardless of any change in these control signals. The apparatus comprises a counter for counting the number of control signals tra... | 03/13/1984 |
| 4410982 | Arrangement for extending digital signaling to telephone subscribers' substations A centrally located digital multiplexer distributes T1 digital signals between a digital central office and a plurality of subscriber service circuits each located at a corresponding subscriber's premises. The subscriber service circuits provide digital s... | 10/18/1983 |
| 4397030 | Digital communication system A digital subscriber terminal equipment is connected to the line circuit at a local exchange via a conventional subscriber line but permits simultaneous transmission of speech and data (e.g., viewdata). The terminal equipment and the line circuit each con... | 08/02/1983 |
| 4388718 | Digital telecommunication system A digital telecommunication system has a plurality of 64 kbit/s channels subdivided into respective 56 kbit/s primary channels and 8 kbit/s auxiliary channels. Continuously from subscriber-to-subscriber, the 56 kbit/s primary channels serve respectively a... | 06/14/1983 |
| 4333175 | Telephone system using pulse code modulated subscriber lines In an all-digital telephone system for communication between a central office and widely scattered subscriber locations, means are disclosed for carrying digital service from the central office to various distribution locations over T1-type equipment and ... | 06/01/1982 |
| 4272843 | System for transmitting service communications A radio system composed of a transmitter and an associated receiver in combination with a data transmission device and an associated voice instrument. Service channel signals operating at a frequency at the lower end of the system base band are conducted ... | 06/09/1981 |
| 4271509 | Supervisory signaling for digital channel banks A digital transmission system is disclosed in which time slots in selected frames are reserved for supervisory signaling bits. These signaling bits can be used to represent a large number of supervisory states by assigning at least three bit patterns to e... | 06/02/1981 |
| 4268722 | Radiotelephone communications system A telephone system for providing communications between mobile radiotelephones, portable radiotelephones and landline telephones includes a land-line telephone system including a land-line switching network for providing communication paths for land-line ... | 05/19/1981 |
| 4220821 | Off-hook initiated demand assignment communications Off-hook initiated demand assignment (OHIDA) has particular application in communications satellite systems and provides basic demand assignment trunk service by utilizing an off-hook and on-hook signal processing system to monitor and control terrestrial... | 09/02/1980 |
| 4154983 | Loop carrier system for telecommunication and data services A versatile loop communication system is disclosed wherein recurring frames of the ring carrier signal are divided by a movable partition into a dynamically allocated time division channel portion and a data packet communication portion. A common signal c... | 05/15/1979 |
| 4142070 | False framing detector A framing circuit for a pulse code modulated, time multiplexed data receiver provides terminal framing by first detecting a predetermined terminal frame bit code and then checking for false framing by utilizing a false framing detector to count the number... | 02/27/1979 |
| 4046964 | Testing of digital systems A digital subscriber loop transmission system is disclosed through which a number of remote subscribers are serviced with a smaller number of time division channels. The digital transmission system includes an automatic channel testing unit which selects ... | 09/06/1977 |
| 4021618 | Intra link calling within a subscriber digital system Disclosed is a feature for use in a subscriber digital multiplexer interfacing between a central telecommunications office (CO) and a plurality of remote terminals, each remote terminal serving a number of subscribers. Calls from and to lines at the same ... | 05/03/1977 |
| 4001514 | Subscriber digital multiplexing system with time division concentration A digital multiplexer for transmitting control, signaling and speech information in digital form between a central telecommunications office (CO) and a plurality of remote terminals. The system serves a plurality of lines at the exchange and couples those... | 01/04/1977 |
| 3997728 | Unit for the simultaneous switching of digital information and signalling data in P.C.M. transmission systems A switching unit for a multiplex pulse code modulation transmission system formed of incoming and outgoing multiplex digital circuits divided into a number of frame locking, information and signalling time slots. The information time slots are grouped in ... | 12/14/1976 |
| 3937892 | Electronic time-division-multiplexed PABX telephone system A private automatic branch exchange (PABX) telephone system includes a number of stations connected to a transmission cable by appliques. By digital messages sent over a communication line in the cable, in signalling and supervision time slots, the appliq... | 02/10/1976 |
| 3936609 | Submultiplex transmission of alarm status signals for a time division multiplex system A time division multiplex system includes a status channel as well as a plurality of information channels and a frame synchronization channel in each frame. A submultiplexer combines a "winking" framing pulse with four different status signals to derive a... | 02/03/1976 |
