I am currently using Cisco 1720 with T1 DSU/CSU. Office will upgrade to DS-3 next week. I don't want to continue to use 1720 since it is an old router. I want to purchase a new one with a new WIC which can handle DS-3 line (will be 9Mbps at first and can be upgraded upto 45Mbps on the fly). I like to see if you guys can help with the following questions.
Any suggestion on a new router (which model)
Currently router configuration can be imported to new router
Can I continue to use current T1 DSU/CSU for the new router and for DS-3? If not, Which DS3 DSU/CSU should I purchase?
I appreciated all of your suggestions