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AWGN Additive White Gaussian Noise FEXT Far End Crosstalk NEXT Near End Crosstalk PLC Power Line Communication PSD Power Spectral Density SNR Signal-to-Noise Ratio VDSL Very high bit rate DSL xDSL "x" Digital Subscriber Line
This paper presents a new innovative method of FEXT modeling based on the conclusions given by extensive measurements performed for a standard unshielded twisted UTP cable.
These simulations and calculations of a summary transmission rate are based on the results of the advanced FEXT model together with the VDMT modulation for the elimination of crosstalk.
The standard model of FEXT crosstalk between twisted pairs or quads in a cable comes from the derivation of interactions between them, which results in the formula [5] given as
where [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] represents the power transfer function of FEXT between two pairs, [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] is the power transfer function of a pair, l is a length of pairs, f is a frequency and [K.
where [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] stands for a FEXT voltage transfer function for frequency f in Hz and FEXT coupling length d in m.
For the FEXT to be dimensionless, as the ratio of the noise voltage to the signal voltage, kf has to have units of nsec/in.
This simple rule of thumb offers a quick and painless path to estimate the expected FEXT in a design.
Glossary ATM asynchronous transfer mode ELFEXT equal level far-end crosstalk FEXT far-end crosstalk ISDN integrated services digital network ISO International Organization for Standardization LAN local area network NEXT near-end crosstalk OSI open systems interconnection OTDR optical time domain reflectometer POTS plain old telephone service PSELFEXT power sum equal level far-end crosstalk PSNEXT power sum near-end crosstalk TDR time-domain reflectometer TIA Telecommunications Industry Association UTP unshielded twisted pair WAN wide area network
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