DSL line interference susceptibility
AssigneeBritish Telecommunications public limited company
InventorsDavid Rohlfing, Paul Benyon, Phil Bull
Life of this patent
Estimating the term…
Abstract
A method is presented of determining whether a digital subscriber line is susceptible to radio frequency interference. The method measures the signal to noise ratio (SNR) margin on the digital subscriber line over a number of 24 hour periods. The measured SNR margin over a given 24 hour period is then compared to a reference function of SNR margin over time (24 hours), where the SNR margin of the reference function is higher during the day and lower during the night, and also repeats daily. A measure of the interference susceptibility is generated based on the degree of similarity between the measured SNR margin and the reference function.
Claims14
A method of determining an interference susceptibility of a digital subscriber line, said method comprising steps of:
- measuring a signal to noise ratio margin of the digital subscriber line over a period time to obtain a measured signal to noise ratio margin of the digital subscriber line over the period time;
- comparing the measured signal to noise ratio margin of the digital subscriber line over the period of time to a reference function to determine a degree of similarity between the measured signal to noise ratio margin and the reference function, wherein the reference function represents a signal to noise ratio margin over time and where the signal to noise ratio margin of the reference function is higher during a day and lower during a night, and the reference function repeats daily;
- determining the interference susceptibility of the digital subscriber line based on the degree of similarity from the comparing step.
A line analysis unit for determining the interference susceptibility of a digital subscriber line at least adapted to:
- measure a signal to noise ratio margin of the digital subscriber line over a period of time to obtain a measured signal to noise ratio margin of the digital subscriber line over the period time;
- compare the measured signal to noise ratio margin over the period of time to a reference function to determine a degree of similarity between the measured signal to noise ratio margin and the reference function, wherein the reference function represents a signal to noise ratio margin over time and where the signal to noise ratio margin of the reference function is higher during a day and lower during a night, and the reference function repeats daily;
- determine the interference susceptibility of the digital subscriber line based on the degree of similarity from the comparing step.
Dependencies are inferred from the claim text.