(Due to the rationality and advancement in technology selection and network architecture, the joint networking mode of PTN IPoverWDM/OTN is an ideal solution for IP-based services. The difference in nature between PTN and SDH/MSTP and the functional combination of PTN and IPoverWDM/OTN completely break the networking idea of ??traditional SDH equipment. At the same time, with the development of the whole service, the service bandwidth, service flow, and QoS requirements of different types of users are not the same. To this end, it is necessary to consider the unified bearer of different services in the PTN IPoverWDM/OTN network, so that operators must not only fully consider the advanced nature of the network architecture at the beginning of networking, but also must ensure the sustainable development of the network from a long-term perspective. Based on different indicators such as service types, bandwidth requirements, and QoS mechanisms, the IP-based services that PTN can carry are roughly divided into three categories: base station services (mainly IP-based voice), important government and enterprise customer services, and full-service access services (including general group customers and home access).)
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