@Sunshine In communications science engineering there is no such thing as attenuation of 0

@Sunshine ok ; my dear ,, dsl tester: https://www.senter-e.com/optical-fiber-testers-and-tools/optical-fiber-tools/optical-fiber-tools-dsl-adsl-tester2-adsl.html I am only facing problem with this...

Dear's ,, What is the defect? Attenuation equals zero dbm !! But by a dsl tester the attenuation(Attenuation Down Stream) is equal to 4dbm !!! What's the solution?! hint: Router Age:1week(new) best...