ADSL splitterThis product is mainly used in ADSL network .it can separate low-frequency voice signal from high signa. By filtering the ADSL digital signals' disturing effect  to the quality of telecommunication .it can  solve the decline of ADSL upload and download speed caused by the loss of static high-frequency signal  .at the same time ,it can protect telephone ,fax machines and modems in the lighting,over-voltage,over -current circumstances