Networking help

[tidusjar]

Looking at buying asus RT-N65U.

Problem is I'm not sure how to set it up with my current system. What I have currently :

ADSL phone socket > ADSL filter > sky router/modem.

Since this router does not have a modem how will I use it?

 

[tidusjar]

Ok awesome. It has the option to turn off DHCP server.

 

[tidusjar]

Will I see a performance increase on my network speeds? But I guess not really on the Internet speed as I'm still using the sky as a modem? I presume cable connections don't need a modem and only ADSL connection does?