I've got a wireless network to install in a concrete building with alot of steel reinforced concrete walls. There will be less then 20 devices (PC's and 2 printers) on this segment of the network with 4 PC's on the 2nd floor. If I start from the DSL router and work my out from there.. can I "Link" or "Chain" Access Points (Linksys 802.11b) to create a sort of "backbone" down the hall and up the stairs? Or do i need something else?