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AssigneeSiemens Aktiengesellschaft
InventorsKarl Bauernfeind, Gerhard Blaess, Alfred Heindl
Estimating the term…
A method for measuring the transmission characteristics of a transmission line during gaps in communications on said transmission line consists of monitoring the transmission line for a gap in communication thereon, and applying an identifier signal followed by a test pulse to the input of the transmission line when such a communications gap is recognized. An output of the transmission line is monitored and when the identifier signal is recognized, the test pulse which follows the identifier is evaluated. The test pulse is made up of a plurality of component frequencies at equally spaced intervals, and evaluation of the test pulse at the output yields the attenuation of phase characteristics of the transmission line for each component frequency, without interfering with communications on the line.
A method of measuring the transmission characteristics of a transmission line by applying a test pulse to an input to the transmission line and evaluating, by Fourier analysis, the deformation of the test pulse as it is produced at an output of the transmission line, said test pulse being formed of a plurality of components having a preselected number of different frequencies and predetermined amplitudes and initial phase angles, and formed according to the equation:
Apparatus for measuring the transmission characteristics of a transmission line comprising in combination first storage means located near an input of said transmission line, and being connected with its output to said transmission line, said first storage means storing a plurality of sampling values corresponding to the magnitude, at consecutive time intervals, of a test pulse formed of a preselected number of individual components at preselected frequencies, said first storage means storing an identifier, means for reading out said identifier from said first storage means and said sampling values from said first storage means in succession, during a gap in communication over said transmission line, a monitoring circuit for monitoring said transmission line and producing a control signal in response to said communications gap, second storage means located at an output of said transmission line, said second storage means storing values corresponding to the initial parameters of said test pulse, means for sampling sequential intervals of the test pulse as it arrives at said output, means for deriving values corresponding to the parameters of said components as they are presented at said output, means for comparing said derived values with the values stored in said second storage means, and a decoder circuit at said output for monitoring said transmission line and for inhibiting operation of said comparing means, except after said identifier is recognized.
Dependencies are inferred from the claim text.