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| Number | Title | Issue Date |
| 4631698 | Interface apparatus An interface apparatus for interconnecting signal lines of a computer connector and a peripheral device connector with non-matching interconnect patterns having mismatched data lines or open inputs on handshake or control lines. A pair of conductive paths... | 12/23/1986 |
| 4628511 | Apparatus for analysis of computer channel failures A method and apparatus for identifying the failing equipment in a computer system when a failure condition is experienced by a computer operator while accessing a computer input/output channel. The apparatus has a memory system which records pre- and post... | 12/09/1986 |
| 4627071 | Distortion analyzer for quadrature demodulated data Method and apparatus for displaying measures of distortion present at the outputs of a quadrature demodulator. From each of the in-phase and quadrature channels of the demodulator there are acquired n parallel bits, m of these bits being the demodulator d... | 12/02/1986 |
| 4625332 | Programmable time varying attenuator A programmable time varying attenuator has a reprogrammable digital circuit or impressing an analog attenuation signal on a continuous wave noise signal. This signal is fed to the input of a receiver and since the digital circuitry can be reprogrammed with... | 11/25/1986 |
| 4611320 | Programmable testing analyzer The invention relates to a transmission testing arrangement for executing performance tests for a telecommunication system which includes a central switch to the common control unit, a switching network, and line interface units internally connected to th... | 09/09/1986 |
| 4551585 | Arrangement for facilitating external loop analysis testing for a digital switching system The present invention is an interconnection of a loop analysis test system (LATS) to a digital switching system. This arrangement includes the utilization of existing network units to establish a path connection from the computer of a LATS system to a mea... | 11/05/1985 |
| 4547633 | Method of and circuit for locating faults in a digital telecommunication subscriber termination For locating faults in digital telecommunication subscriber terminations various test loops (A, B, C) are closed and checked by signals transmitted via the exchange (16). When a fault is proved to exist in the so-called C-loop, it cannot be detected wheth... | 10/15/1985 |
| 4545013 | Enhanced communications network testing and control system A network control and test system for application to data communications networks. In a first mode of operation, the system learns the network configuration automatically and builds a table describing the network configuration. In a second mode of operati... | 10/01/1985 |
| 4545011 | Enhanced communications network testing and control system A network control and test system for application to data communications networks. In a first mode of operation, the system learns the network configuration automatically and builds a table describing the network configuration. In a second mode of operati... | 10/01/1985 |
| 4542507 | Apparatus for switch path verification The present invention relates to an apparatus for verifying a data path through a digital switch between a transmitting port and a receiving port. The apparatus comprises a transmitter which transmits a test data block in a first predetermined time slot w... | 09/17/1985 |
| 4524446 | Signal quality monitor for protective relay system A signal quality monitor, and a protective relay system using the monitor, which utilizes both AC and DC signals from the receiver agc stage to monitor a plurality of different signal parameters. A signal responsive to the noise in the communication chann... | 06/18/1985 |
| 4513419 | Digital conversion circuit and method for testing digital information transfer systems based on serial bit communication words A circuit and method are disclosed for testing line replaceable units (LRUs) and interconnect buses of an avionics system in which the various LRUs exchange information by means of transmitting and/or receiving digital communication words, each word havin... | 04/23/1985 |
| 4498716 | Data monitoring connector for testing transmission links Known data patterns are injected and received at various points along a data link using a special data monitoring connector at least at two pieces of equipment in the link. Each connector includes a housing containing a circuit board upon which is printed... | 02/12/1985 |
| 4486855 | Activity detector usable with a serial data link An activity detector device detects the presence or absence of information transmission over a serial data link between a computer system and a peripheral device. If a presence of a data signal exists as determined by the activity detector, the data signa... | 12/04/1984 |
| 4482980 | Hybrid optical/electrical data highway A communications system with a local network having two metallic cables providing redundant channels between stations of a group with redundant optical rings forming a highway interconnecting those networks. An optical-electrical interface connects the ne... | 11/13/1984 |
| 4402082 | Automatic line termination in distributed industrial process control system A control system for controlling an industrial process includes a plurality of remotely located process control units (remotes) each coupled to an associated input/output device(s) and adapted to communicate with one another through a dual channel communi... | 08/30/1983 |
| 4393491 | Automatic self-test system for a digital multiplexed telecommunication system An automatic self-test apparatus for use in a digital multiplexed communication system and self-testing idle circuitry coupled to idle telephone lines. The apparatus utilizes a tone generator which generates digital words describing an analog test signal ... | 07/12/1983 |
| 4376998 | Muldem with monitor comparing means which accepts different data rates A muldem (100) includes a transmit multiplexer section (103, 104) combining a variety of low speed and intermediate speed digital data inputs into a single high speed data output. A monitor (101) is provided for testing data path failures through the muld... | 03/15/1983 |
| 4347600 | Monitored muldem with self test of the monitor A muldem (100) has a monitor (101) for testing data path failures through the muldem (100) by comparing the latter's input and output. The monitor (101) tests itself by injecting errors into one of the compared data streams for detection thereof if the mo... | 08/31/1982 |
| 4311882 | Method of and arrangement for testing traffic routes in telecommunication networks One central unit (NQTC) provided per network section controls a number of remote units (NQTR) distributed over the network section by transmitting to them all data needed for a sequence of test calls via a switched line. The remote units perform the test ... | 01/19/1982 |
| 4259663 | Contention interference detection by comparison of transmitted and received signal information When a plurality of transceivers share a common communication medium or radio frequency channel, then collision interference will result when two or more transceivers transmit simultaneously. In order to detect this simultaneous transmission, an interfere... | 03/31/1981 |
| 4247941 | Simulator for bit and byte synchronized data network A data communication simulator system wherein the basic operational conditions of a bit and byte synchronized data network may be simulated by generation of a bit timing signal, a byte timing signal, data signals, and control and status indication signals... | 01/27/1981 |
| 4163210 | Arrangement for checking a contact inserted between a transmitter circuit and a receiver circuit to allow electrical signals to be transmitted An arrangement for checking contact betweena transmitter circuit situated upstream and a receiver circuit situated downstream, the contact being made to enable electrical signals corresponding to 1 and 0 logic states produced by the transmitter circuit to... | 07/31/1979 |
| 4122358 | Supervisory system for a data transmission system In a data-transmission route involving parallel (e.g. 8Mb/s) data-transmission systems each using a separate line pair, a common line pair, linking all terminal and repeater stations, is used for supervisory and control purposes (signals up to say 25 KHz)... | 10/24/1978 |
| 4112264 | Testing and switching system including remotely controllable stations for information transmission and communications networks and systems A testing and switching (tester) system is disclosed for information transmission and communications networks and systems and the like. According to a preferred embodiment, a data transmission network is advantageously of the type in which remotely locate... | 09/05/1978 |
| 4110572 | Method and apparatus for testing transmission lines A method and apparatus for testing for forward echoes produced by signal transmission through a length of transmission line in which a succession of 1 ns pulses are applied to the line and the outward signals are multiplied by pulses delayed by a successi... | 08/29/1978 |
| 4032884 | Adaptive trunk data transmission system An adaptive trunk data transmission system in which data bits to be communicated are not transmitted during certain fade durations of a multi-channel propagation characteristic, but are delayed instead, until the fade interval is over, when they are then ... | 06/28/1977 |
| 4006320 | Fault locating system and method for transmission lines and repeater stations A communication system has at least one supervisory station and a large number of repeater stations spaced along a four-wire two-way transmission line. A number of repeater stations are selected at equal intervals along the line to have a coupling network... | 02/01/1977 |
| 3934224 | Apparatus for continuous assessment of data transmission accuracy in a communication system A method and apparatus are disclosed for monitoring the accuracy of electronic data transmitted over a communication channel or telemetry link. Data is monitored at the transmitting point and also at the receiving point. Data monitored at the receiving po... | 01/20/1976 |
