I live in an old house with lathe and plaster walls, so my Cisco DPC3848V wifi signal doesn't reach the back bedroom. I bought a D-Link DAP 1620 wifi range extender. Instructions are simple. Plug in close to the router, push WPS button on both devices, and wait for connection. When I push the WPS button on the Cisco, NOTHING happens. The WPS light doesn't turn on or even flash. Nothing. I push it anyway, then push the WPS on the D-Link, per the instructions. Still nothing happens. So I connected the D-Link to the Cisco using an Ethernet cable. Now the D-Link's light is green. Connected, great. But as soon as I pull out the Ethernet cable, no more connection. Please help!!!!