My current network I have two connections with two CSU/DSU connected to external encryption devices connected to a serial interface port on a 3825 series cisco router. The distant end is connected the same way.
My first connection I have pulse-time 5 set on the interface and the interface is up up. My second connection is the same setup however when I set pulse-time 5 on the interface, the interface will flap between up down and down down even when I am in loopback. When I take pulse-time 5 off, the interface will stay up down. I tired switching the serial interface cards and the problem still occurs.
Can anyone explain why my first connection is good with pulse-time 5 and my second connection is not when they are the same configurations?