An apparatus for isolating ADSL signals from POTS signals includes a single low pass filter for filtering the POTS signals for all POTS terminal devices within a customer's premises. The low pass filter is mounted within a line isolation device (LID) connected between a telephone jack and an ADSL transceiver....http://www.google.com/patents/US6449362?utm_source=gb-gplus-sharePatent US6449362 - Apparatus, systems and methods for isolating ADSL signals from POTS signals
