Since optical ring is the main topology in metro ring, it is of great significance to study the MAC (media access control) protocol, which is discussed in this paper.
光环网是构建城域光网络的主要拓扑方式，因此研究城域光环网的MAC协议是十分必要的。
Since optical ring is the main topology in metro ring, it is of great significance to study the MAC (media access control) protocol, which is discussed in this paper.
光环网是构建城域光网络的主要拓扑方式，因此研究城域光环网的MAC协议是十分必要的。
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