Patent ID: 9148504
Filing Date: 2015-09-29
Classification: H04L,H04M

Abstract:
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.