Method and system for single-ended line testing

摘要

The present disclosure relates to a method, a node, a system and a computer program for input impedance measurements in the form of return loss measurements, such as single-ended line testing. The disclosure also relates to a communication system having a near-end terminal and at least one far-end terminal. The near-end terminal is capable of communicating instructions to the far-end terminal in order for the near-end terminal to perform echo impulse response measurements on subsequent states of impedance for comparing, analyzing and for enabling improved localization of faults.

主权项

1. A method for input impedance measurements in a communication system having a near-end terminal and at least one far-end terminal, the near-end terminal being capable of communicating instructions to the far-end terminal, the method comprising the steps of:
the near-end terminal instructing the far-end terminal to exercise a first state of impedance; the near-end terminal performing a first echo measurement and recording the measurement result; in accordance with a predetermined signaling scheme, the near-end terminal instructing the far-end terminal to change its impedance from a first state to a second state, the second state of impedance being different from the first state; the near-end terminal performing a second echo measurement and recording the measurement result; and utilizing the difference between the first and the second states of impedance in a processing means to determine a relation there between as a basis for one or more of loop qualification, fault detection and fault localization on a communication line between the near-end and the far-end terminals.