UncategorizedCisco 4300 T1 controller configuration April 7, 2016 - by Admin User controller t1 0/1/0 clock source line primary ! controller t1 0/1/1 clock source line secondary ! network-clock synchronization automatic network-clock input-source 1 controller T1 0/1/0 network-clock input-source 2 controller T1 0/1/1