ADSL SPLITTER, DISLAM and PSTN devices coupled high - frequency data signal and low frequencies of speech signals in a two - core phone line to the end user in the ADSL communication line. When ADSL Splitter signals to the end user, and then ADSL splitter for speech separation of high frequency ADSL modem connected to a computer on the internet. The low frequency voice signal separation to a telephone, a fax machine etc., Terminal equipment and so on.