DSM Modem Adapter #Freecycle

DSL filter (2Wire LFT4-1 model), AKA modem phone line filter. DSL filters are designed to eliminate interference and noise on telephone lines caused by DSL signals, allowing you to use both your phone and internet service without disruption. Usage: You need a DSL filter for every device connected to your phone line except your DSL modem. Connection: It typically connects between the phone line wall jack and the telephone