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AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsKlas Ericson, Roberto Menezes Rodrigues, Joäo C. Weyl Albuqerque Costa, Aldebaro Klautau
Estimating the term…
The present invention relates to a method and an arrangement based on two-port network (TPN) theory that allows analytically estimating the loop transfer function from open and short-circuited input impedance measurements, e.g. single ended line transmission (SELT) measurements, by utilizing the fact that the line under test (LUT) can be considered reciprocal and by assuming that the LUT is symmetric. Hence, by using the present invention and an estimation of the noise on the line, the attainable bit rate at the customer premises can be determined by means of SELT measurements at the CO. The transfer function of a telephone copper-loop is estimated regardless of its topology by impedance measurements from the CO side. Specifically, such estimation is carried out from the calculation of the transmission parameters of loop, which are expressed only in terms of open and short-circuited input impedance measurements at the CO when reciprocity and symmetry is assumed.
A method for estimating a transfer function at a central office (CO) to be used for performing loop qualification of a digital subscriber line between the CO, and a customer premises (CP) regardless of the topology of the loop to be qualified, the method comprising the steps of:
An arrangement for estimating a transfer function at a central office to be used for performing loop qualification of a digital subscriber line between the central office (CO) and a customer premises (CP) regardless of the topology of the loop to be qualified, the arrangement comprising:
Dependencies are inferred from the claim text.