求翻译： 因为PON的多点广播特性，所有的下行数据都会被广播到PON系统中所有的ONU上。如果有一个匿名用户将它的ONU接收限制功能去掉，那么它就可以监听到所有用户的下行数据，这在PON系统中称为“监听威胁”。是什么意思？

 Because the PON multicast features, all of the downstream PON systems will be broadcast to all of the ONU. If an anonymous user will limit its function to remove ONU receiver, then it can listen to all downstream users, which is called in the PON system, "monitoring the threat."

正在翻译，请等待...