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| Number | Title | Issue Date |
| 7977950 | Time-domain reflectometer The present invention provides a time domain reflectometer for testing an electrical cable. The time domain reflectometer includes a test signal generator, at least one line feed resistor, connected between the test signal generator and a pair of terminals, for conn... | 07/12/2011 |
| 7893696 | Pulse circuit using a transmission line A circuit is provided wherein a test pulse is provided to a device under test. A module allows the test pulse to pass through to the device under test. The module blocks a reflected pulse from passing through to the device under test when the reflected pulse has an ... | 02/22/2011 |
| 7847561 | Network device, network connection detector and detection method thereof A network device, a network connection detector and a detection method thereof are disclosed. The network device includes a socket, a waveform generator and a reflected wave detector. The waveform generator sends a first test wave to at least a first contact of a pl... | 12/07/2010 |
| 7777496 | Remote sensor system for monitoring the condition of earthen structure and method of its use A system and associated method permit remote monitoring of subsurface structure for purposes of early detection and location of hidden anomalies, e.g., water seepage in levees. Anomalies may be due to sand boils or displacement of underlying soil. Representative sys... | 08/17/2010 |
| 7683628 | Cable tester A physical layer device includes a cable test module that transmits a test pulse on a cable, measures a reflection amplitude, calculates a cable length, and determines a cable status based on the measured amplitude and the calculated cable length. A frequency synthe... | 03/23/2010 |
| 7652483 | Network device, network connection detector and detection method thereof A network device, a network connection detector and a detection method thereof are disclosed. The network device comprises a socket, a waveform generator and a reflected wave detector. The waveform generator sends a first test wave to at least a first contact of a p... | 01/26/2010 |
| 7652482 | Network analyzer, network analyzing method, automatic corrector, correcting method, program, and recording medium The error of a measurement system can be corrected even if the frequency of an input signal of a device under test is different from that of the output signal. A signal output acquiring section acquires the power of the input signal by a power meter not shown in the... | 01/26/2010 |
| 7622931 | Non-contact reflectometry system and method Non-contact reflectometry for testing a signal path is described. The technique includes using capacitive coupling to inject a test signal into the signal path and extract a response signal from the signal path. Reflectometry techniques are used to determine charact... | 11/24/2009 |
| 7548068 | System for testing properties of a network A method for identifying properties of a downhole electromagnetic network in a downhole tool sting, including the step of providing an electromagnetic path intermediate a first location and a second location on the electromagnetic network. The method further include... | 06/16/2009 |
| 7414410 | Cable diagnostics using time domain reflectometry and application using the same A system and method are used to determine connectivity and/or cable faults of a cable. A signal transmitting and receiving system is coupled to the cable. An analog-to-digital converter (ADC) coupled to the signal transmitting and receiving system. A TDR system coup... | 08/19/2008 |
| 7400151 | Connector crosstalk and return loss cancellation A device for testing data communications cabling. The device consists of a signal generator that can generate a test signal to test the data communications cabling and a receiving component that can receive a reflected signal produced by reflection of the test signa... | 07/15/2008 |
| 7383133 | Diffuse seismic imaging systems and methods Systems and methods are disclosed to construct subsurface images from diffuse seismic energy. Various disclosed system embodiments include multiple seismic sensors that each convert received seismic energy into one or more seismic signals. One or more processor comb... | 06/03/2008 |
| 7375532 | Cable tester A physical layer device comprises a first port adapted to communicate with one end of a cable. A second port is adapted to communicate with an opposite end of a cable. A cable tester communicates with the first and second ports and selectively tests the cable to det... | 05/20/2008 |
| 7370106 | Network revision system with local system ports A revision system for a network having a plurality of data ports, pairs of the data ports being connectable by a patch cord to place the pairs of data ports into communication with each other, the revision system including a computer processor, a scanner in communic... | 05/06/2008 |
| 7358745 | Cable tester A physical layer device comprises a first transceiver that selectively communicates with a cable medium. A detector detects a power over Ethernet (POE) device. A switching device selectively provides power from a power supply over the cable medium when the detector ... | 04/15/2008 |
| 7342393 | Multimeter with filtered measurement mode A multimeter with a filtered measurement mode. By pressing a single button or key, a low-pass filter is switched into the signal path to filter voltage spikes, noise, and switching transients from pulse-width modulated pulses, or lower frequency sinusoidal signals w... | 03/11/2008 |
| 7312613 | Method for network diagnostic A method for network diagnosis between a source end and a destination end coupled by a transmission line is provided. The method includes the following steps. First, a first test signal is transmitted from the transmitter to the receiver when the hybrid is set to a ... | 12/25/2007 |
| 7310315 | Node judging method, communication system, and node measuring apparatus In a communication system wherein a station transceiver and a plurality of nodes communicate in a TDM system through a signal transmission line, at least a part of the line is shared, a method to judge nodes performing normal operation from the station transceiver c... | 12/18/2007 |
| 7307428 | Method for single ended line testing and single ended line testing device A single ended line testing method for qualifying an electrically conducting line, including the steps of sending a plurality of randomized excitation signals from a first end of the line towards a second end of the line, subsequently taking measurements, at the fir... | 12/11/2007 |
| 7295654 | Digital kick meter and graphical user interface (GUI) A digital kick meter measures capacitive kick between two conductors and ground of a cable. The digital kick meter includes a resistance measuring circuit connectable to two of the conductors to provide a signal indicative of a capacitance between the two conductors... | 11/13/2007 |
| 7282922 | Wire network mapping method and apparatus using impulse responses A method and apparatus for mapping a wire network is disclosed. The method includes obtaining a reflectometry test signal of the wire network. An estimated network impulse response is estimated from the reflectometry response. A wire network model is then initialize... | 10/16/2007 |
| 7276913 | Cable tester A cable tester tests cable to determine a cable status. A mode selector selects one of a first operating mode and a second operating mode. A pretest module senses activity on the cable and selectively enables testing based on the sensed activity when in the first op... | 10/02/2007 |
| 7276914 | System and method for guided TDR/TDT computerized tomography A system for detecting a defect or discontinuity in media or at an interface of the media includes a signal generator; a transmission path coupled to the signal generator, wherein the transmission path is arranged along or through the media; a detection circuit for ... | 10/02/2007 |
| 7276921 | Probe of under side of component through opening in a printed circuit board A test device includes an element having a surface for contacting a first plane, and a probe having a free end positioned in a second plane. The element of the test having the surface to contact the first plane includes features for contacting a ground plane. The le... | 10/02/2007 |
| 7271596 | Method and system for testing a signal path having an operational signal A technique for testing a signal path while an operational signal is present is disclosed. The technique may be performed without injecting a test signal into the signal path by using an operational signal already present in the signal path. A method of testing a si... | 09/18/2007 |
| 7272669 | Providing compatibility with both electrically isolated and non-isolated modules in an ethernet system A system and method for configuring a slot to be compatible with both modules that are compliant with the isolation requirements for power over Ethernet and modules that are not compliant. ... | 09/18/2007 |
| 7268560 | Wideband device modeling method A wideband device modeling method comprises using ultra-short time-domain impulse responses measurement and using a subsequent extraction of said ultra-short time-domain impulse responses measurement. The wideband device modeling method in the invention is to provid... | 09/11/2007 |
| 7254217 | Fault characterization using information indicative of echo A fault associated with a communication medium is analyzed by correlating a first set of information indicative of echo associated with the communication medium with a second set of information indicative of echo. The fault is characterized based on the correlation ... | 08/07/2007 |
| 7253636 | Wire tracer receiver A method and apparatus includes a signal generator, a power supply, a micro-controller, a transmitter and a receiver for determining the condition of a line. The signal is passed through the line and any reflection is used to determine varying characteristics of the... | 08/07/2007 |
| 7250771 | Cable tester A cable tester comprises a test initiating module that performs B cable tests. Each of said B cable tests includes selectively transmitting a test pulse on the cable, measuring a reflection amplitude, and calculating a cable length. A test results module determines ... | 07/31/2007 |
| 7250772 | Method and apparatus for characterizing a signal path carrying an operational signal A method of characterizing a signal path includes (i) generating a reference spread-spectrum signal; (ii) coupling the reference spread-spectrum signal into the signal path while the signal path is carrying an operational signal; (iii) receiving a reflected spread-s... | 07/31/2007 |
| 7245129 | Apparatus for and method of cable diagnostics utilizing time domain reflectometry A novel mechanism for performing high accuracy cable diagnostics. The mechanism utilizes time domain reflectometry (TDR) to detect and identify cable faults, perform estimations of cable length, identify cable topology, identify load and irregular impedance on metal... | 07/17/2007 |
| 7239680 | Methods for performing channel diagnostics A method is used to determine information about a communication channel using an adaptive filter coupled to the channel. The adaptive filter includes adaptive filter coefficients. The filter coefficients are compared to filter coefficient thresholds. A determination... | 07/03/2007 |
| 7215126 | Apparatus and method for testing a signal path from an injection point The invention includes an apparatus and method for testing an electronic signal path. The apparatus includes a signal generator (102) configured to inject a test signal into the electronic signal path at an injection point when coupled to the signal path. The... | 05/08/2007 |
| 7212008 | Surveillance device detection utilizing non linear junction detection and reflectometry An apparatus for detecting concealed surveillance devices coupled to a transmission line uses either a time domain or frequency domain reflectometry operation to locate any impedance anomalies on the transmission line and a non-linear junction detection operation to... | 05/01/2007 |
| 7208959 | Methods for measuring parasitic capacitance and inductance of I/O leads on an electrical component using a network analyzer Methods are provided for measuring the potential for mutual coupling in an integrated circuit package of any type or configuration using a network analyzer in conjunction with a coaxial test probe. Simple, low-cost test fixturing and methods of testing may be used t... | 04/24/2007 |
| 7176697 | Flexible probe for measuring moisture content in soil The embodiments of the invention are directed to a new apparatus and method of measuring the water content using time domain reflectometry (TDR), or electrical conductivity in deep soil levels. to. The method uses flat, flexible, waveguides attached to a flexible sl... | 02/13/2007 |
| 7173431 | Cable tester A physical layer device communicates over a cable and includes a cable tester that determines a cable status, which includes an open status, a short status and a normal status. The cable tester includes a pretest module that senses activity on the cable and selectiv... | 02/06/2007 |
| 7170297 | Transmission response measurement system and method of using time gating A method and a measurement system determine a transmission response of a device under test (DUT). The method includes measuring a reflection response from a first port of the DUT while a known reflective termination is on a second port of the DUT, and time gating th... | 01/30/2007 |
| 7171322 | Algorithm for estimation of multiple faults on a transmission line or waveguide An algorithm is provided for a frequency domain reflectometer which takes into account both attenuation per unit length of transmission line and phase shift per unit length of transmission line in a modified Inverse Fourier Transform that converts a frequency domain... | 01/30/2007 |
