the present invention provides a method to reduce the crosstalk between lines assigned to a digital subscriber line service or fat - pipe , which will then improve the signal to noise ratio and the line reach . it can also be used to assign multiple lines to a fat - pipe , where the number of available to a fat - pipe customer is not enough for the corresponding service . the service performance can be improved through interference management by identifying those lines that are not strongly coupled , and thence assigning them to dsl service or fat - pipe , instead of using lines that are already assigned to the plain old telephone service and fat - pipe . the number of available lines for the fat - pipe customers can be increased by using lines that have already been assigned to plain old telephone service customers , but which are not used for data transmission . when a pots customer &# 39 ; s line is to be used for another customer &# 39 ; s dsl or fat - pipe service , it is required to use a low - pass filter on the pots customer &# 39 ; s line to prevent him / her from having access to the dsl or fat - pipe customer &# 39 ; s data , and a high - pass filter on the dsl or fat - pipe customer &# 39 ; s line to prevent him / her from having access to the voice signal on the line .