Patent application number | Description | Published |
20090024340 | Method and a System for Cable or Subscriber Loop Investigation Performing Loop Topology Identification - A system and method for using loop topology identification to investigate a transmission line having a plurality of cable segments. At a measurement plane for each segment, a probing signal is transmitted into the cable. A reflected signal is detected, and an equivalent total input impedance is calculated. The system iteratively calculates the distance between the measurement planes as well as the length, characteristic impedance, and the propagation constant of each segment. A model is used to calculate the respective equivalent input impedance of each segment using the calculated characteristic impedance, propagation constant, and length of the preceding segment. The equivalent total input impedance is then calculated from the iteratively calculated segment values. | 01-22-2009 |
20090213998 | METHOD AND DEVICE FOR ESTIMATING PROPERTIES OF A TELECOMMUNICATION TRANSMISSION LINE - A method and device for estimating one or more transmission properties of a telecommunication transmission line. At least one signal is sent on the line, the at least one signal including at least two frequencies for which the absolute value of the line propagation constant times the line length is less than π, and a resulting signal is received. An estimate of at least one transmission line property is then determined by examining the relationship between the sent and resulting signal or signals. The process may be repeated, if necessary. The estimate determination may also be repeated one or more times, with each successive estimate preferably using for the determination only those frequencies for which, as previously estimated, the absolute value of the line propagation constant times the line length is less than π. | 08-27-2009 |
20090268879 | CHARACTERISTICS DETERMINATION OF A DIGITAL SUBSCRIBER LINE - A system, method, and transceiver unit for determining one or more properties of a digital subscriber line (DSL) utilizing a time-variable finite impulse response (FIR) filter. The transceiver unit sends a loop test signal to the line and calculates an impulse response of a reflection of the loop test signal from the line. The calculated impulse response is filtered utilizing the time-variable FIR filter and properties of the line are determined. Characteristics of the FIR filter may be controlled by a set of parameters that vary as a function of time according to a predetermined formula. As a result, the FIR filter provides both high time resolution of closely separated pulses and amplification of far-end pulse reflections. | 10-29-2009 |
20110091019 | Method for Transmission Line Analysis - The present invention concerns methods for estimating one or more transmission properties of a telecommunications transmission line. Estimates of the line input impedance, Z | 04-21-2011 |
20120069883 | Passive Selt - The present invention relates to a method for estimating properties of a transmission line by means of features of a noise spectrum generated by noise entering said transmission line at an intermediate location between the ends of the line. The invention provides possibility to estimate a number of properties, e.g. length of a portion of the transmission line, line attenuation of said Sine portion and even line termination. | 03-22-2012 |
20130158922 | ESTIMATION OF A QUANTITY RELATED TO IMPEDANCE - Method, arrangement and network node/device for estimating a quantity related to impedance in a first frequency interval, D | 06-20-2013 |
20130163729 | CALIBRATION OF A LINE DRIVING DEVICE - Method, arrangement and devices for calibration of a line driving device, such as a DSLAM, having a line port. The method comprises deriving of a first parameter vector, PVinf, for example Hinf. The parameter vector PVinf is derived by performing, at a first site, an echo measurement on the line driving device while the line port on said line driving device is open. The method further comprises calibrating the line driving device based on the first parameter vector PVinf and a second parameter vector PVref, which second parameter vector is based on information on echo measurements performed on at least one reference line driving device. | 06-27-2013 |
20140025327 | Transmission Line Parameter Determination - The invention concerns a method for determining parameters in a model of a transmission line. The method comprises obtaining ( | 01-23-2014 |