To configure this point-to-point T1 connection, you need some information from the Telco and setup your CSU/DSUs accordingly. For example, linecode, framing, clock source etc needs to be configured as told by the Telco on the CSU/DSU (external or inbuilt)
Also the following documents might be of some help:
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...