A frame sent by an adapter indicating a serious ring problem, such as a broken cable. An adapter is said to be beaconing if it is sending such a frame.

• 由适配器发送的一种帧,指示出现了严重的环路问题,如电缆断开。如果适配器正发送这样的帧,就说它正处于警报状态。同beacon message。