Filters DSL modem

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to prevent dsl signal entering phone lines telephones, answering machines, faxes , other devices cause interference, dsl modems come low pass filters must plugged phone lines going voiceband devices on same line. filter blocks frequencies above 4 khz, blocks dsl signal while allowing voice frequency signals through. filter must not inserted in phone line going dsl modem, because block communication between modem , switching center.







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