If i view "sh int serial" as below, notice that loopback not set. Is this loopback option useful only in wicg703 type card with inbuilt DSU? Or is it useful in normal sync serail ports such as v.35 etc
home#sh int se 0
Serial0 is administratively down, line protocol is down
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...