follow up Access point wireless routers

[GGD]

This is what the wiring configuration should look like.

Comcast Coax -> Cable Modem -> Dlink wired router -> Ethernet Cable -> 3rd floor -> Wireless Router's LAN port.

With a Wireless Router, to make it look like an Access Point you'll need to turn of it's DHCP server, and assign it a static IP within your LAN's subnet so that you can access it's config page once connected, and plug the Ethernet cable from the primary router into one of it's LAN ports. Leave it's WAN port empty.