通过对城域网环境下OTN网的应用研究,提出了引入建议及组网模型,主要研究了骨干层新增OTN节点、骨干层网络安全提升2个方面的应用场景及方案模型。 Through the research on the application of OTN network in metropolitan area network (MAN), this paper proposes the introduction and networking model, and mainly studies the application scenarios and scheme models of adding OTN nodes in the backbone layer and improving network security in the backbone layer.