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By applying OTN technology, the flexibility of service E2E scheduling is guaranteed, and bandwidth sharing for different services is realized. With rich OTN overhead and simple network management operations, network maintenance and fault location can be easily accomplished.
OTN OSN1800VCross Application
Signal streams of any granularity can be aggregated into ODUk pipelines, and multiple services from multiple sites can be mixed in the same ODUk to achieve flexible service scheduling and high bandwidth utilization.
ODU0-basedGE E2ETransmission
Through end-to-end service scheduling, intermediate sites directly configure cross-connections on the line side, eliminating the need for back-to-back physical fiber connections, thus saving a lot of intermediate site fiber connection time and allowing for rapid service release. It also reduces the potential points of failure and maintenance workload.
OTNoverhead-basedserviceE2Emanagement
With the rich OTN overhead compliant with ITU-T G.709 protocol, together with simple network management operation, E2E service monitoring and management can be realized.
With OTN overhead, the OTN network realizes transparent transmission of customer services and provides FEC ( forward error correction ) capability. During network operation, with network management, E2E service monitoring and management can be easily performed, and in case of failure, fault localization can be easily accomplished.
Flexible bandwidth applicationbased onODUflex
OptiX OSN1800 V equipment supports ODUflex (Optical Digital Unit with Flexible Rate) technology, which can be well adapted to various service types such as video, storage, data, etc., and is compatible with future IP service transmission requirements.
Channel monitoring across different carriers
When networks of different carriers are interconnected, TCM ( Tandem Connection Monitoring ), which is part of OTN overhead, can be used to monitor the quality of channels across different carrier networks. In the event of a failure, the TCM overhead allows for easy fault delimitation.
OTN cross-application
With the help of OTN crossover, signal flows of any granularity can be aggregated into ODUk pipelines, and multiple services from multiple sites can be mixed in the same ODUk, realizing flexible service scheduling and high bandwidth utilization.
It supports centralized crossover at the level of ODU0/ODU1/ODUflex/ODU2/ODU2e and inter-board crossover at the level of ODU2/ODU2e. The application of OTN crossover is shown in Figure 1-9. Customer-side services at any rate reach the IP/MPLS backbone layer through flexible crossover and bandwidth sharing in the OTN network.
Service 1, Service 2, and Service 3 are accessed through the A station. They are encapsulated separately and share the bandwidth.
AtstationA,Service 1andService 2are mixed and encapsulated into anODU1pipe but do not take up all theODU1bandwidth, andService 3is encapsulated into anODU0pipe.
The ODU1andODU0pipes are processed asOTUoptical wavelength signals, respectively, and then passed tostationB.
The lOTU signal arrives at the B station and is passed to the destination after being flexibly up and down and assembled into the ODUk pipeline.
AtstationB,Service 3is terminated andService 5can use theODU0pipelineformerlyoccupied byService 3.
Service 4is merged into theODU1pipelinenot occupied byService 1andService 2.
The ODU0andODU1pipescarrying the reassembled servicesare processed asOTUoptical wavelength signals,respectively,and passed tothe Cstation.
End-to-end management of services based on OTN overheads
End-to-end service monitoring and management can be realized with rich OTN overhead compliant with ITU-T G.709 protocol and simple network management operations.
With OTN overhead, OTN networks realize transparent transmission of customer services and provide FEC ( forward error correction ) capability. During network operation, with network management, end-to-end service monitoring and management can be easily carried out, and fault localization can be easily accomplished in case of failure. The end-to-end management of services based on OTN overhead is shown in Figure 1-10.
Channel monitoring across different carriers
When networks of different carriers are interconnected, you can use TCM ( Tandem connection monitoring ) in the OTN overhead to monitor the channel quality across different carrier networks. In the event of a failure, fault delimitation can be easily accomplished with the help of the TCM overhead.
Figure 1-11 shows an example of monitoring a channel across different carrier networks by using TCM overhead. ITU-G G.709 specifies that a maximum of six levels of TCM are supported.In the example, three levels of TCM overhead are used to monitor different networks.
The customer uses TCM1 to monitor the QoS of the optical layer UNI-UNI.
The operator uses TCM2 to monitor the QoS of the operator's network.
Carrier A and Carrier B use TCM3 to monitor intra- and inter-domain network connectivity.
In the event of a failure, the location of the failure can be identified by the status of TCM1, TCM2, and TCM3.
Flexible bandwidth applications based on ODUflex
OptiX OSN 1800 V equipment supports ODUflex (Optical Digital Unit with Flexible Rate) technology, which can be well adapted to various types of services such as video, storage, data, etc., and is compatible with the transmission requirements of future IP services.
One of the application scenarios of ODUflex is to meet the needs of various general CBR ( Constant Bit Rate ) services transmitted in OTN, customer services above 2.48832Gbit/s CBR are mapped to ODUflex ( CBR ) particles using bit synchronization, and ODUflex ( CBR ) particles are used to complete end-to-end performance monitoring and protection inversion, etc. ODUflex V equipment supports ODUflex (Flexible Rate Optical Digital Unit) technology. The overhead definition and monitoring management of ODUflex is exactly the same as that of traditional ODUk ( k=0, 1, 2 ). The application scenarios are shown in Figure 1-12 and Figure 1-13.
Figure 1-12 shows how to apply ODUflex to transmit general CBR service signals. the FC400 occupies 4sub-TS time slots mapped to ODUflex particles, the 3G-SDI occupies 3sub-TS time slots mapped to ODUflex particles, and the FC400 and the 3G-SDI share a common OTU2 wavelength for transmission.
Figure 1-13 shows how ODU2 is applied to transmit the generalized CBR service signals. the FC400 and 3G-SDI are mapped to different ODU2 particles and each occupies one OTU2 wavelength for transmission.
