hey,
first thnx for ur reply , and sorry for my englich cuz am from germany , i saw what a coax cable mean on google and yes i have the same one , i had alot problems in the signal and the speed of my internet in the old device (router or modem) ihave a 100mbps internet and a 98mbps actuall but i get only 10mbps or like this , my old device is a 'HITRON:CVE-30360' and the new one is ' TP-LINK:TD-W8961ND' and the tp link have no coax cable input , thnx for ur help.