If carrier transitions and interface resets are increasing or if input errors are high while this occurs, the problem is likely to be a bad link or defective CSU or DSU.

• 假如载波变化和介面重置在增加中或者此时输入错误是很高的，这些问题可能是由坏掉的连接线或有缺陷的CSU或DSU所导致。