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1.发明公开A METHOD AND A SYSTEM FOR CABLE OR SUBSCRIBER LOOP INVESTIGATION PERFORMING LOOP TOPOLOGY IDENTIFICATION 有权方法和系统的电缆或用户连接的调查正在实施一个环形结构参数识别
公开(公告)号：EP1982432A1
公开(公告)日：2008-10-22
申请号：EP06704611.0
申请日：2006-01-31
摘要： The present invention relates to investigation of a transmission line with cable segments (Si, ..., SN) by loop topology identification. A measuring equipment is connected at a first measurement plane Pi and means (1;5) are provided for transmitting a probing signal into the cable, and for handling the reflected signal, calculating means (6) calculates the equivalent total input impedance, e.g. Z(1)in (f) . Calculating means are adapted to, for i=, ...,N, establishing the lengths of the cable segment Si , the distance di from a measurement plane PI to the subsequent one Pi.+1 Algorithm executing means (7) are adapted to use a model for calculating the characteristic impedance and the propagation constant of segment Si - based on unknown parameters represented as a respective vector θι (Si) to set up a criteria function Ji associated with said model and to, for each Si, apply Ji on the model, iteratively calculate the respective equivalent input impedance, of the respective Ji using the calculated characteristic impedance Zo(f, θι) of the preceding segment Si, the propagation constant Ϝ(f, θι) with an estimated length of the respective preceding segment Si and its equivalent input impedance and to transform the total input impedance of the subsequent plane Pi.+1 such that a loop topology identification is provided iteratively.
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2.发明授权A METHOD AND A SYSTEM FOR CABLE OR SUBSCRIBER LOOP INVESTIGATION PERFORMING LOOP TOPOLOGY IDENTIFICATION 有权方法和系统的电缆或用户连接的调查正在实施一个环形结构参数识别
公开(公告)号：EP1982432B1
公开(公告)日：2016-08-10
申请号：EP06704611.0
申请日：2006-01-31
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3.发明公开METHOD, DEVICE AND PROGRAM PRODUCT FOR ESTIMATING PROPETIES OF A TELECOMMUNICATION TRANSMISSION LINE 有权方法，设备和程序产品用于电信输电线路估算性能
公开(公告)号：EP1941628A1
公开(公告)日：2008-07-09
申请号：EP05798831.3
申请日：2005-10-27
发明人： ALLEVAD, Stefan, Alf , ÖDLING, Per, Mikael , FERTNER, Antoni , BACK, Henrik, Daniel , LINDQVIST, Fredrik , BÖRJESSON, Per, Ola , RIUS I RIU, Jaume
CPC分类号： H04B3/46
摘要： Determining of transmission properties of a telecommunication transmission line wherein a complex input impedance of the line is first determined (204) from the relationship between a signal sent on the line (200) and a received resulting signal (201). For frequencies for which the absolute value of the propagation constant times line length is less than, the line input impedance can be expressed in terms of line constants (line capacitance, resistance, inductance and conductance) and frequency using a Taylor series expansion. After truncation of higher order terms and insertion of measured values, the resulting system of equations can be solved and the line constants generated (206), provided that there are at least two frequencies. Furthermore, from the line capacitance and a standard value for line capacitance per km, a line length can be estimated (207).
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公开(公告)号：EP1625735B1
公开(公告)日：2008-01-16
申请号：EP04717331.5
申请日：2004-03-04
发明人： BÖRJESSON, Per, Ola , FERTNER, Antony , JENSEN, Axel, Frank , LINDQVIST, Fredrik , ROSENBERG, Jonas , WIA , Adam , ÖDLIN, Per
摘要： The length and attenuation of a signal line between a transmitter and a customer premises equipment is to be estimated. A frequency dependent line input impedance (Z in (f)) as seen from the transmitter, is measured and an absolute impedance value (oe Z in (f) oe), is generated. The latter is shown as a curve (A1) in the diagram with the frequency (f) on the abscissa and the impedance (oe Z in (f) oe) on the ordinate. Extreme values (Max. 1 , Max 2 , Max 3 ; Min 1 , Min 2 , Min 3 ) arc denoted and a frequency distance (FD 1 -FD 4 ) between two consecutive of the extreme values is generated. The line length (L) is generated as L=½.vop/FD 1 , in which vop is the velocity of propagation of a signal on the line. The attenuation is estimated by multiplying the line length with an average attenuation value for the actual line type. The advantages are that the line length can be estimated with good accuracy in a simple manner for short lines and that the line attenuation is estimated in a simple manner.
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公开(公告)号：EP1625735A1
公开(公告)日：2006-02-15
申请号：EP04717331.5
申请日：2004-03-04
发明人： BÖRJESSON, Per, Ola , FERTNER, Antony , JENSEN, Axel, Frank , LINDQVIST, Fredrik , ROSENBERG, Jonas , WIA , Adam , ÖDLIN, Per
摘要： The length and attenuation of a signal line between a transmitter and a customer premises equipment is to be estimated. A frequency dependent line input impedance (Z in (f)) as seen from the transmitter, is measured and an absolute impedance value (oe Z in (f) oe), is generated. The latter is shown as a curve (A1) in the diagram with the frequency (f) on the abscissa and the impedance (oe Z in (f) oe) on the ordinate. Extreme values (Max. 1 , Max 2 , Max 3 ; Min 1 , Min 2 , Min 3 ) arc denoted and a frequency distance (FD 1 -FD 4 ) between two consecutive of the extreme values is generated. The line length (L) is generated as L=½.vop/FD 1 , in which vop is the velocity of propagation of a signal on the line. The attenuation is estimated by multiplying the line length with an average attenuation value for the actual line type. The advantages are that the line length can be estimated with good accuracy in a simple manner for short lines and that the line attenuation is estimated in a simple manner.
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