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在光传输领域,一个重要的趋势是OTN的部署从传统意义的核心网下移到了城域网。据IDC对OTN芯片市场的预测,到2015年,OTN芯片市场预计可达6亿美元规模,其中,核心层占1.8亿美元,城域网占4.2亿美元。城域网OTN和核心网OTN的最大区别在于:城域网的业务类型非常多,比如以太网、存储网、视频、SONET/SDH这些业务都要无缝连接;此外,所有运营商都需要扁平化传送,减少网络层次,而且要实现端到端的运维。这一系列特殊的应用需求,都对城域网OTN提出了新挑战。
An important trend in the field of optical transmission is that the deployment of OTN moves from the traditional core network to the metropolitan area network. According to IDC OTN chip market forecast, by 2015, OTN chip market is expected to reach 600 million US dollars scale, of which the core layer accounted for 180 million US dollars, metropolitan area network accounted for 420 million US dollars. MAN OTN and core network OTN biggest difference is that: metro MAN very many types of business, such as Ethernet, storage networks, video, SONET / SDH these services must be seamlessly connected; In addition, all operators need to flatten Transfer, reduce the network level, but also to achieve end-to-end operation and maintenance. This series of special application requirements all pose new challenges to the metro OTN.