SYSTEM AND METHOD FOR SELECTIVE FILTER ISOLATION

摘要

In a system including a plurality of telephones (20a-n) coupled to an asymmetric digital subscriber line (12), a circuit (30) operable to facilitate communication using the asymmetric digital subscriber line including a filter (40) having a corner frequency and being operable to be coupled between one of the plurality of telephones and the asymmetric digital subscriber line, and to attenuate transients associated with the telephone operating in an off-hook state. The circuit also including a switch (50) coupled to the filter and operable to effect a change in the corner frequency of the associated filter depending on whether the telephone coupled to the filter is operating in an on-hook or an off-hook state, the change in the corner frequency operating to attenuate parasitic interference associated with telephones in an on-hook state.