The Effect of Signal-to-Noise Margins on the Performance of ADSL

J.H. van Wyk and L.P. Linde (South Africa)


Asymmetric Digital Subscriber Line (ADSL), SignaltoNoise ratio (SNR) margin, Performance margin, Interference margin, Margin estimation


There is renewed interest in existing copper networks since the introduction of Asymmetric Digital Subscriber Line (ADSL) technology. ADSL will soon be available in South Africa, opening the broadband market to prospective users. As many users are placed within the same cable, they interfere with each other. Service providers want to guarantee the supplied data rate to the customer, even as the network change over time. For this purpose, a Signal-to-Noise ratio (SNR) margin is added to the customer proļ¬le. This paper estimates the number of interferers (possible services) which can be allowed for different line lengths, interferer types and SNR margins for a maximum data rate over the line.

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