I have installed a 3Com 48 Port Switch to provide broadband Internet to an office with 28 users. We were using inexpensive Netgear and/or Linksys wireless routers to deliver DSL to the users but have upgraded to 2 T1 connections from our ISP. We have a static IP address for our LAN. My questions are; regarding the switch (3com Switch 2250 Plus 48 ports 10/100 + GB 3C16476A SFP). Do I, simply, set the Switch IP address to the one given to me by my ISP in order to deliver the Internet to the users? Secondly can I put one of my wireless routers between the ISP connection and the 3com switch to provide a temporary firewall untill I can research an affordable solution to securing the network. I am fairly new to networking. Unfortunately cost is a limiting factor until our office can get up and running. Our ISP comes into the office on Cat5, RJ45 connection. If practical to do so, how can I connect the RJ45 to the telephone port of the wireless router. We need to be up and running by Tuesday morning. That is why I am considering the temporary firewall solution.