CONTRIBUTION TITLE: Models of Numbers of NEXT Disturbers and NEXT Loss SOURCE: Telcordia Technologies, pursuant to work supported by Ameritech, BellSouth,
Abstract:
This contribution presents a study of the number of crosstalk disturbers to use for modeling 1 % worstcase power-sum NEXT. A probabilistic model of the number of DSLs in a binder is presented that includes the effects of DSL subscribers clustering at places such as apartments or large business locations. This model predicts that the 1 % worst case number of disturbers per binder will be from 22 to 28. The log-normal probability distribution of pair-to-pair NEXT loss is presented. Then the model of the number of crosstalk disturbers and the model of pair-to-pair NEXT loss are combined to find the joint probability distribution of NEXT loss as both the number of disturbers and the pair-to-pair NEXT loss are simultaneously allowed to vary randomly. This joint distribution represents the power-sum NEXT coupled into each DSL. The joint 1 % worst-case NEXT is found to be surprisingly close to models that assume a 1 % worst case number of disturbers simultaneous with 1 % worst-case NEXT.
Citations
| 2 | More realistic analysis assumptions for spectrum management – al - 1999 |
| 2 | Statistical Behavior of Crosstalk – Lin - 1980 |
| 1 | The Crosstalk Model is Not Overly Conservative – Kerpez |
