Subscriber line tester
AssigneeYokogawa Electric Corporation
InventorsTakashi Yoshida, Norio Shimabara
Life of this patent
Estimating the term…
Abstract
A subscriber line tester for communication lines that convey high speed digital data, wherein a transmission side tester is provided that divides a measuring frequency region into two or more blocks, generates multi-sine waveforms obtained by combining sine waveforms of two or more frequencies in each block, and outputs the multi-sine waveforms to the communication line; and a reception side tester is provided that measures the multi-sine waveforms in the most suitable range for each block, and synthesizes a spectrum from each spectrum obtained for each block, so that high speed communication and long time period measurement are improved.
Claims14
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;
- and
- means for outputting said plurality of multi-sine waveforms to said communication line;
- and
- a 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;
- and
- means 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.
A subscriber line tester for communication lines that convey high speed data, said tester comprising:
- a display having a screen means for causing said display to display measured noise characteristics of a communication line on said screen;
- and
- means for over-writing a typical noise spectrum of said screen of said display.
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 region into two or more blocks:
- means for generating multi-sine waveforms obtained by combining sine waves of two or more frequencies in each block;
- and
- means for outputting said multi-sine waveforms to said communication line;
- and
- a reception side tester comprising:
- an analog to digital converter connected to another end of said communication line;
- a memory;
- a second controller for controlling said analog to digital converter and said memory;
- means for measuring said multi-sine waveforms in a most suitable measuring range for each block;
- and
- means for synthesizing a spectrum for each spectrum obtained for each of said blocks;
- wherein
- said multi-sine waveform generating means comprises
- means for generating multi-sine waveforms in the form of repeated waveforms;
- and further comprising
- means for applying Fourier transform processing to said multi-sine waveforms after subjecting said multi-sine waveforms to averaging.
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 region into two or more blocks;
- means for generating multi-sine waveforms obtained by combining sine waves of two or more frequencies in each block;
- and
- means for outputting said multi-sine waveforms to said communication line;
- and
- a reception side tester comprising:
- an analog to digital converter connected to another end of said communication line;
- a memory;
- a second controller for controlling said analog to digital converter and said memory;
- means for measuring said multi-sine waveforms in a most suitable measuring range for each block;
- and
- means for synthesizing a spectrum from each spectrum obtained for each of said blocks;
- and further comprising:
- means for overwriting a typical noise spectrum on a screen of a display where measured noise characteristics of said communication line is displayed.
Dependencies are inferred from the claim text.