The intelligent optical network based on Huawei's OTN OSN8800. lt;/strong> SDH transmission equipment based on Huawei's OTN OSN8800 intelligent optical network will provide a very ideal solution for the transmission of large-grain broadband services. The transmission network mainly consists of inter-provincial trunk transmission network, intra-provincial trunk transmission network, and metropolitan (local) transmission network, which can be further divided into core layer, aggregation layer, and access layer. Compared with SDH, the biggest advantage of OTN technology is that it provides scheduling and transmission of large granular bandwidth, so whether OTN technology is adopted at different network levels depends on the size of the bandwidth granularity of the main scheduling service. According to the current status of the network, the main granularity of scheduling at the core layer of the inter-provincial trunk transmission network, the intra-provincial trunk transmission network, and the metropolitan (local) transmission network is generally in the range of Gb/s and above, so these levels can be prioritized to be constructed by adopting the OTN technology which has better advantages and scalability. For the aggregation and access level of the metro (local) transport network, when the main scheduling granularity reaches the Gb/s level, OTN technology can also be prioritized for construction.

With the IP-based network and services, the development of new services and the rapid increase of broadband users , IP traffic on national trunk lines has increased dramatically and bandwidth demand has grown exponentially year after year. WDM national trunk line carries PSTN/2G long-distance service, NGN/3G long-distance service, Internet national trunk line service and so on. Due to the huge amount of bearer services, the WDM national trunk line has a very urgent need for the protection of bearer services.

2. Provincial/regional backbone optical transport network

3. Metro/local optical transport network

Table 1 Comparison of MS-OTN mobile bearer solutions

PKT Plane-based Private Line

PKT Plane-based Private Line mainly performs L2 switching for the accessed services, after which it is encapsulated by PWE3 and enters the MPLS Tunnel, and completes service scheduling through PKT crossover. PKT crossover to complete service scheduling. Taking Ethernet services as an example, the PKT plane-based leased line scheme is shown in Figure 3, Figure 4, and Figure 5.

Figure 3 P2P private line based on PKT plane

Figure 5 MP2MP private line based on PKT plane

<p&gt ; OSN8800 PKT plane-based leased lines can turn on the QoS function to provide different quality of service for different leased lines, and through the OAM function to effectively detect, identify and locate network faults.

TDM Plane-based Private Line

TDM Plane-based Private Line mainly encapsulates the access service directly into VC particles, and completes the service scheduling through the VC cross. Taking STM-N services as an example, the TDM plane-based leased line scheme is shown in Figure 6.

Figure 6 STM-N private line based on TDM plane