IEC 62439-7:20 11规定了基于环形拓扑的冗余协议，其中冗余协议在端节点处执行，而不是内置于交换机中。每个节点使用媒体传感技术检测链路故障和链路建立，并与其他节点共享链路信息，以保证快速的连接恢复时间。节点具有相等的RRP网络管理功能。 本出版物应与IEC 62439-1:20 10一起阅读。

IEC 62439-7:2011 specifies a redundancy protocol that is based on a ring topology, in which the redundancy protocol is executed at the end nodes, as opposed to being built into the switches. Each node detects link failure and link establishment using media-sensing technologies, and shares the link information with the other nodes, to guarantee fast connectivity recovery times. The nodes have equal RRP network management functions.

This publication is to be read in conjunction with IEC 62439-1:2010.