Accompanied by the All IP process of accelerating,OTN,PTNas a representative of a new generation of optical transmission technology is replacingthe status ofDWDM,MSTP, and gradually become the mainstream optical transmission products.OTN,PTNas a new technology, new product form, how to reasonably and effectively in the metropolitan area, the local network to choose and plan the network, how to effectively carry out the joint network, has undoubtedly become a focus of attention of the current industry. The focus of attention of the industry is undoubtedly.

1Brief analysis of OTN andPTNtechnology

1.1 OTN Technology

OTNis evolved fromDWDMtechnology, and on its basis, following thestandards set by theG.709protocol,re-encapsulating the line-side interface ofthe OTU, and can be flexibly introduced on-demand electric cross and optical cross. This change makes itsignificantly ahead ofDWDMinterms ofOAM, service scheduling capability, etc. Therefore,OTNtechnology is regarded as the most competitive next-generation backbone network transmission technology.

1.2 PTN Technology

The emergence ofPTNhas subverted many characteristics of traditional optical transmission products to a certain extent, which retainsthe easy management, maintenance and multiple service protection capability ofMSTP, and at the same time, comprehensively transforms the traditional cross-core part, realizes the evolution from circuit switching mechanism to packet switching mechanism, and possesses the capability of elastic bandwidth allocation, statistical multiplexing and differentiated service. PTN ' s core technology determines its natural advantagein carryingIP-based services.

2Advantages of adoptingOTN+PTNjoint network organization

Before discussingthe issue of OTN+PTN joint network, we should first analyze the advantages and disadvantages of each technology, so that we can make good use of their strengths and complement each other's advantages to form an efficient and secure next-generation transmission network.

( 1 )Advantages ofOTNtechnology

The advantage ofOTNis that it is good at solving theproblem of ultra-long-distance and ultra-large bandwidth transmission ofIPservices, and it canprovide transmission channelsfor a large number of2.5 Gbit/s,10 Gbit/sand even40 Gbit/sand other large-grain services, which isdifficult forPTNto achieve. However,the bandwidth allocation ofOTNis also rigid, the bandwidth utilization is not high, and it is difficult to deal with smaller granular services.

( 2 )Advantages ofPTNtechnology

The beauty ofPTNtechnology lies in the perfect combination of data technology and transmission technology, high-capacity packetswitching/label switching technology andQoStechnologyfrom the data side, andOAMmanagement,50 msprotection and synchronizationfrom the transmission side, which can enable the operator's basic network facilities to obtain the greatest technical advantages, enhance the flexibility of rapid deployment of new applications in the future, and reduce costs.The advantages of PTNare reflected in theflexible access tosmall-grainedIPservices, convergence and convergence of services, and is not good at the transmission of a large number of large-grained services.