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4G网络在如今有着高速发展的数据业务,其传输网络的承载能力正面对着巨大的挑战。以SDH结合WDM的模式曾是业务承载的主要模式,随着IP化业务发展需求的不断扩大,己逐渐不能满足基于TDM内核的SDH技术;而WDM技术只能解决传送大容量数据的问题,带宽管理机能下降,数据业务处理能力受到限制。以交换内核为基础,在IP化业务的承载上PTN技术有着显著的优势,可将SDH技术短板问题弥补。在城域网内,需要考虑的需求有:调度、汇聚和保护恢复等,而OTN的部署可以顺利解决WDM组网所带来一系列难题。对PTN和OTN两的业务承载、网络结构和维护等综合因素进行考虑,可知PTN和OTN具有最好的融合性和互补性,从而达到统一承载业务的目的。
Nowadays, with the rapid development of data services, the 4G network is facing a huge challenge in its transport network carrying capacity. The combination of SDH and WDM has been the main mode of service bearer. With the continuous development of IP services, SDH technology has gradually failed to meet the SDH technology based on TDM core. However, WDM technology can only solve the problem of transmitting large data, Management functions decline, data processing capacity is limited. Based on the exchange of cores, PTN technology has significant advantages in carrying IP-based services and can make up for the short board problem of SDH technology. In the metropolitan area network, the need to consider are: scheduling, aggregation and protection of recovery, and OTN deployment can successfully solve the WDM networking brings a series of problems. Considering the comprehensive factors such as service bearer, network structure and maintenance of PTN and OTN, it can be seen that PTN and OTN have the best integration and complementarity so as to achieve the purpose of unified bearer service.