Patent ID: 9667464
Date: 2017-05-30
CPC Classifications: H04B,H04L,H04M

Claim:
1. A method in a Time Division Duplexing (TDD) modem for making line measurements, the device having a transmitter and a receiver, and having a normal mode of TDD communication, the line measurement comprises: operating in the normal mode of TDD communication with the transmitter and the receiver set to operate in alternating transmit and receive time slots; switching from the normal mode of TDD communication by setting the transmitter and the receiver to operate simultaneously for performing a Frequency Domain Reflectometry (FDR) Single Ended Line Test (SELT) measurement in a time slot; while out of the normal mode of TDD communication, making the FDR SELT measurement, during which the transmitter and receiver operate simultaneously, the measurement comprising sending a test signal to the line, wherein making the FDR SELT measurement while out of the normal mode comprises sending test signals to a line/loop connected to the TDD modem and receiving echo responses from the line/loop, wherein the test signals comprise discrete tones which number and characteristic features (per data symbol) are adapted to the receiver performance and the resources of a processor; and the method further comprises determining the result of the line measurement by processing of said received echo responses.