Method for measuring line parameters of subscriber lines of a te

Details Method for measuring line parameters of subscriber lines of a te Method for measuring line parameters of subscriber lines of a te

1988-08-08

1989-07-04

Schreyer, Stafford D.

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Testing of subscriber loop or terminal

324606, 324541, 324523, H04B 346, H04M 124

Patent

active

048457370

ABSTRACT:
A method for measuring line parameters of subscriber lines of a telecommunication system in which end devices, exhibiting a capacitance, are connected to two wires of the subscriber lines is disclosed. The line parameters measured include the capacitances between each of the line wires and ground, the capacitance between the line wires, the leakage resistances between each of the line wires and ground, and the insulating resistance between the line wires. This task is accomplished by performing the following steps while the end device is connected to the subscriber lines. These steps are performed in three measuring configurations sequentially: first one of the two wires of the subscriber line is grounded and the measurement is performed in connection with the other, then the other one of the two wires is grounded and the measurement is performed in connection with the first, and then both wires of the subscriber line are connected together and the measurement is performed on the pair. First, an impulse voltage is impressed through a charging resistance. Then the wire or wires in the particular measuring configuration is discharged through a discharge resistance coupled to ground. At discrete points in time the corresponding resulting voltage values are measured. On the basis of the measured values obtained thereby, the known values of the line resistance and capacitance of the end device and relationship of the line parameters to the known values and the measured values, the values of these line parameters are determined.

REFERENCES:
patent: 2414624 (1947-01-01), Wilson

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