Dsl- compatible pots line card

An improved plain old telephone service (POTS) line card that may be directly connected to a customer line that is also connected to a digital subscriber line access module. A second order filter is added to the front end of the POTS line card in order to attenuate XDSL signals and to lower its amplitude. A new digital signal processor (DSP) includes further low pass filtering functions, gain compensation, termination impedance compensation and balance network compensation to provide the proper balanced network as is known in current POTS cards but not provided in current XDSL services. This card may also be used alone, without a XDSL equipped line.