Method of determining the physical length of a telephone line

Details Method of determining the physical length of a telephone line Method of determining the physical length of a telephone line

1993-07-30

1995-08-08

Voeltz, Emanuel T.

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Of trunk or long line

364562, H04M 124

Patent

active

054406110

ABSTRACT:
A method for determining the length of a telephone line from an exchange to a subscriber. The method is based on the availability in the exchange of so-called line circuits, each having a given amplification factor G for the signal transmitted from a given subscriber through the line, this factor being stored and made available to the microprocessor of the line circuit card. The attenuation for each unit of line length D between the exchange and the subscriber is known. Since these magnitudes are known, the line length L is calculated in the microprocessor from the equation L=k.G/D, where k is a constant which is calculated for a given determined length, amplification factor and attenuation/length unit.

REFERENCES:
patent: 4083039 (1978-04-01), Simon
patent: 4734637 (1988-03-01), Chen et al.
patent: 4751724 (1988-06-01), Amadio et al.
Gunnar Bjurel, Andre Dudnik and Royne Hjortendal, "Development of Line Circuits for AXE 10", Ericsson Review, No. 4, pp. 181-185 (1983).

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