Connecting my airport extreme to comcast cable modem-- AGHHH

I've had three Comcast techies to my house since switching over to their triple play offer. Today, I finally got connected to the Internet, through their cable wired into my house, and connecting their modem to my Mac mini (which does not have wireless card). I want to hook up two other laptops in the house, but can't figure out how I do that? The Comcast guy today said with an ethernet cord. So I've plugged the cord into the back of my Extreme, but the other end doesn't fit into the only slot remaining on the back of the cable modem -- which is labeled "phone"... Does anyone know how I do this?
Thanks,
Jill

You need either a router or an ethernet hub/switch between the modem and the computers to give you the needed ethernet ports. Hubs/switches are cheaper but, depending on the Comcast policy on multiple computers on one modem, may not all work at the same time.
A router, on the other hand, allows up to something like 255 devices to be connected. Instead of the Comcast server passing out IP addresses as would happen with a hub, the router issues the addresses to each device. This is useful when the ISP limits how many IP addresses can be assigned to one account (we had this with our ISP--limit of three--and is why we now use a router).
Basically, the arrangement is:
cable from wall >>> cable modem >>> router or hub >>> multiple ethernet lines out to individual computers
See if this video helps:
http://videos.howstuffworks.com/labratstv/829-episode-6-home-network-primer-vide o.htm

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