In my house I have two phone line sockets, one upstairs and one downstairs. In the room upstairs with the phone line in, it does not receive the wireless signal very well from the downstairs room. Is there a way I can use a second router from the upstairs phone line, if I turn off dhcp, whilst keeping the main router downstairs also connected to the phone line socket? Or do I have to create an access point instead with the second router, connected via Ethernet cable to the main router downstairs?