You are better off to simply order ten one port devices. Second, having one device per connection improves the quality of your connection. Your router is dedicated to running your connection. You don't need to worry that it's overused, oversold, or that it is bogging down because of someone else's traffic. Before you set up your T1 you need to get your network ready.
Most people already have a network going.
You will need one for each computer. Some computers, such as Macintosh, SUN and SGI brand computers, come with the network card already installed. PC computers usually don't. Then you are going to need a hub. Your hub should have one port for each computer and one to connect to the router.