@m.daqa 

Good day.

Sorry for the delay.

May I know what kind of DSL tester did you use？

And can I have a picture that Attenuation Down Stream is equal to 4dbm on the DSL tester? And how about the upstream on the tester?

Did you have any specific issue which might be caused by the line attenuation?

By the way, where are you located and who is your internet service provider?

Thank you very much.

@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 type of router from tplink. 

Knowing that another routers(madawav , mada swift , mada swift plus , d'link , netgear , netis and kasda) was also used, and there is no problem with attenuation,

No image logs dsl tester now.

I am talking about the largest internet companies in Palestine. I am an expert in the Internet company ,,, and with the knowledge we have the internet line divided into an access line from Palestinian Telecommunications and the Internet service provider Mada.ps

Knowing that we have our own router(routers: mada wave "adsl2+ vdsl to 50Mbps"  , mada swift "adsl2+ vdsl to 50" Mbps and  mada swift plus  "adsl2+ vdsl to 100Mbps" ), but we are helping tplink router users to save them money in replacing another router

best regards 

@Sunshine 

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