Patent ID: 6205202
Filing Date: 2001-03-20
Classification: H04M

Abstract:
A subscriber line tester for communication lines that convey high speed digital data, said tester comprising:a transmission side tester comprising:a signal generator connected to one end of a communication line;a first controller for controlling said signal generator;means for dividing a measuring frequency range into two or more blocks;means for generating a plurality of multi-sine waveforms obtained by combining sine waves of two or more frequencies in each block; andmeans for outputting said plurality of multi-sine waveforms to said communication line; anda reception side tester comprising:an analog to digital converter connected to another end of said communication line for receiving and converting to digital signals said plurality of multi-sine waveforms outputted by said means for outputting of said transmission side tester;a memory for storing a plurality of spectra of different multi-sine waveforms;a second controller for controlling said analog to digital converter and said memory;means under control of said second controller for processing said digital signals representing said plurality of multi-sine waveforms in a most suitable range for each block; andmeans for synthesizing a spectrum from each of said digital signal representing said plurality of multi-sine waveforms obtained for each of said blocks which is compared with said spectra stored in said memory, thereby to test said line.