Ok, I don't have any experience configuring networks from this level but here are a few more details. The Cisco 3600 is a modular router. We are currently using the router on a T1 line. We are planning to upgrade the T1 to a bonded T1. The CIO believes we may need to add in another NIC card.
I called a local tech shop and one guy who seemed knowledgeable told me that the router should work with a bonded T1. He said that the speed change doesn't matter, just as long as you keep the same IP address (which we are planning to do). Any opinions?