[USR-TC] some interface is down

Hi! I've noticed that some of the interface were down. With this, some of our clients were unable to get thru. Does anyone could help me to resolve this problem? Interface Oper Admin Name Status Status slot:5/mod:1 Down Up slot:5/mod:2 Up Up slot:5/mod:3 Down Up slot:5/mod:4 Down Up Thanks in advance.