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| Number | Title | Issue Date |
| 5396028 | Method and apparatus for transmission line termination A method and apparatus for transmission line termination is provided in which a transmission line (12 and 14) is terminated by transmission gates (20 and 22) at a transmitter (24) and a receiver (26). The resistances of the transmission gates (20 and 22) ... | 03/07/1995 |
| 4984250 | DC termination circuit for subscriber cables A DC termination circuit is provided for keeping a sealing current on a subscriber line during normal operation in order to prevent an oxidation of contacts in said line. The termination circuit is coupled across the line in response to the normal relativ... | 01/08/1991 |
| 4777330 | Network system diagnosis system A station diagnosis method in a communications network system including a closed ring transmission line and a plurality of data stations which can be connected to the ring transmission line by a plurality of line concentrators disposed in the ring transmi... | 10/11/1988 |
| 4745624 | Automatic line buildout A circuit for restoring and converting bipolar customer data signals into a pair of binary signals at a customer data frequency equal to or less than 250 KHz includes a PCM integrated circuit repeater for restoring and converting 1.544 MHz communication s... | 05/17/1988 |
| 4694470 | Data transmission circuit A data transmission circuit is disclosed which is arranged so that when transmitting data and control signals of a terminal equipment accommodated in a transmission line of 64 Kbps channels through use of a multi-frame arrangement, the data is assigned to... | 09/15/1987 |
| 4680431 | Data network interface module with circuitry for disconnecting a module that has lost supply voltage The invention relates to an interface module for the bidirectional transmission of data streams in a data network with separate power supplies for the individual bus stations. According to the invention, means are provided for bridging the bus station, pr... | 07/14/1987 |
| 4647912 | Coupling discriminator and interface adaptor A coupling discriminator for Ethernet standard local area network interface equipment monitors the electrical characteristics of an incoming differential signal pair, discriminates between a signal pair that is direct coupled and a pair that is transforme... | 03/03/1987 |
| 4642426 | Apparatus for locating faults in a carrier subscriber communication system Method and apparatus is disclosed for identifying faults in a subscriber carrier telephone system utilizing out-of-band pilot signals and comprising pluralities of cables and repeaters that are alternately connected in series between carrier equipment at ... | 02/10/1987 |
| 4633489 | Interface unit inserted between a data transfer unit and a processor unit An interface unit is disclosed which can make asynchronous data communication between a transmitter unit and a receiver unit. The interface unit includes a shift register for receiving start data designating a start of data input and input data from the t... | 12/30/1986 |
| 4622682 | ARQ transmission system A facsimile communication system equipped with an ARQ function for transmitting data in the form of a block between a transmitter and a receiver through a transmission route having a relatively large time delay, such as a submarine cable and communication... | 11/11/1986 |
| 4607379 | Circuit for connecting together multiple serial data lines Apparatus operable without need for an external power source for conveniently interconnecting data communication equipment (DCE), such as a modem, and multiple data terminal equipments (DTE), such as terminals and/or printers, which each have an interface... | 08/19/1986 |
| 4606043 | Programmable automatic cable equalizer The circuit (10) has a gain section which includes a first AGC circuit (12). The output of the gain section goes to a signal shaping section which includes a biquadratic filter (24), a summer (45), and a second AGC circuit (40). The two AGC circuits (12,4... | 08/12/1986 |
| 4434324 | Reversal of connections of telegraphic line wires upon detection of unwanted polarity of the loop current The system comprises at least one teleprinter station (1) connected to an exchange (3) by means of a transmission-reception line (2) and comprising a polarity detector (31) for the line circulating current, and a device (30) for reversing the connection o... | 02/28/1984 |
| 4403111 | Apparatus for interconnecting data communication equipment and data terminal equipment An interface for connecting data terminal equipment (DTE) to data communication equipment (DCE) is provided which requires no modification to an existing and widely accepted DCE connector and yet which permits data communication according to more recently... | 09/06/1983 |
| 4329542 | Circuit arrangement for an electronic d.c. telegraph transmitter An electronic d.c. telegraph transmitter comprises a transmitting keying circuit and a current regulating circuit which operates in accordance with the principle of a continuous regulator and serves to maintain the line current constant. The power loss wh... | 05/11/1982 |
| 4121095 | Optical receiver Optical receiver arranged to provide a dispersion-compensated detection of digital information transferred by a light pulse train via a fibre optic conductor, includes a registering means and a timing regenerating means connected in parallel to the fibre ... | 10/17/1978 |
| 4055775 | Transmission circuit for direct current data transmission A transmission circuit including cross coupled transistors is described. The circuit is symmetrical and the base of each transistor is coupled to the collector of the other and also to a supply voltage through a voltage divider. The output is taken across... | 10/25/1977 |
| 4015190 | Controllable negative resistance electronic switch arrangement An electronic switch arrangement reverses damping of an electronic switching element by means of a controllable negative resistance. Adjustment of the negative resistance is provided by comparing a measuring current through the arrangement to a preselecte... | 03/29/1977 |
| 3980973 | Line device for transmission lines having coaxial cables for the transmission of digital or analog signals A line device for transmission lines having coaxial cables for the transmission of signals, in particular digital signals or analog signals, employs an input equalizer in the form of a line section connected in parallel or in series to the transmission pa... | 09/14/1976 |
| 3949168 | Selectively clamped digital signal transmission system In a system including several devices connected by means of a common data bus the adverse effects of reflections due to two or more devices simultaneously seeking access to the bus are minimized by confining such reflections to parts of the bus remote fro... | 04/06/1976 |
