Can anyone help me? I need to know how to connect the serial interfaces of two Cisco 2500 routers (DB60) to a T1 circuit terminated at both ends as an RJ45 SmartJack. Do I need a CSU/DSU at both ends, or can I configure the serial interfaces at both ends as DCE by setting a clock rate? This is the first time I have done this, any help would be greatly appreciated.