A method and system for evolution of power communication network based on fgOTN

Abstract

The application discloses a power communication network evolution method and system based on fgOTN in the technical field of power system communication network, and comprises the following steps: selecting a hub node to deploy a fusion transmission device, interconnecting the fusion transmission device with a present network SDH device through a standard SDH interface, and interconnecting the fusion transmission device with a present network OTN device through an fgODU interface; gradually replacing the present network SDH device with the fusion transmission device, interconnecting a convergence layer network and a core layer network where the fusion transmission device is located through an STM-1, STM-4, STM-16 channel and a GE, FE channel by adopting a shunt dynamic adaptation interconnection mechanism; when the present network SDH devices of the convergence layer are all replaced with the fusion transmission devices, and the core layer network supports fgODUflex signal scheduling, interconnecting the convergence layer network and the core layer network through a unified OTN and fgOTN protocol channel, and bearing all services through an fgODUflex and ODUk container. The application can promote the network to evolve to a unified OTN / fgOTN protocol plane, and improve network performance, operation and maintenance efficiency, resource utilization and architecture simplicity.

Description

Technical Field

[0001] This invention relates to a method and system for the evolution of power communication networks based on fgOTN, belonging to the field of power system communication network technology. Background Technology

[0002] With the in-depth development of new power systems, the services carried by power communication networks are showing a trend of rapid growth and heterogeneous demand in terms of bandwidth, granularity, latency, and reliability requirements. To adapt to the development needs, the existing municipal-level power communication transmission networks generally have a complex structure with both OTN (Optical Transport Network) and SDH (Synchronous Digital Hierarchy) planes. The OTN plane provides large bandwidth, with its standard container minimum being 1.25G (ODU0), which is inefficient when carrying massive amounts of small-granularity services such as E1 (2M) and STM-1 (155M) in power production control. SDH, due to its advantages of hard isolation and deterministic latency, is the main carrier mode for power production control services; however, its limited bandwidth of 10G is insufficient to meet the needs of new services such as intelligent inspection and high-definition video.

[0003] The coexistence of dual planes directly leads to prominent problems such as multiple devices stacked at a single site, tight equipment room space and fiber optic resources, high maintenance difficulty, and low overall network efficiency. As an evolution of the OTN system, fgOTN (fine-grained optical transport network) technology, by defining a p*10M (p=1~119) fgODUflex flexible container, integrates the advantages of large bandwidth and small-grained service adaptability within a single technical system. At the same time, it also has hard-pipe isolation and low latency characteristics, and is considered an ideal choice for the next generation of power communication networks.

[0004] The challenges of introducing fgOTN technology into existing networks include: building a new fgOTN plane independently would create a three-network parallel structure, increasing operational complexity; a complete network overhaul would present high service cutover risks and large investment costs. Therefore, the industry has long lacked a systematic evolution method to guide the smooth, lossless, and gradual transition of existing networks from their current OTN / SDH dual-plane state to a target network centered on fgOTN. This method needs to address the technical challenges of protocol compatibility between the target technology and existing network equipment with multiple standards, as well as ensuring service continuity. Summary of the Invention

[0005] The technical problem to be solved by this invention is to provide a power communication network evolution method based on fgOTN, which solves the problems of limited feature extraction capability, low efficiency of hyperparameter optimization, and inability of prediction accuracy to meet the needs of high-frequency trading in the spot market in the existing technology.

[0006] To achieve the above objectives, the present invention is implemented using the following technical solution.

[0007] In a first aspect, this invention proposes a power communication network evolution method based on fgOTN, comprising:

[0008] Based on the existing network topology and service distribution of the target area, the aggregation sites and sites carrying the target services in the target area are selected as hub nodes; the existing network topology includes an aggregation layer network equipped with existing SDH equipment and a core layer network equipped with OTN equipment;

[0009] A converged transmission device supporting multi-standard signal processing is deployed at the hub node. The converged transmission device is interconnected with the existing SDH equipment through a standard SDH interface and with the existing OTN equipment through an fgODU interface. The multi-standard signals include fgOTN, OTN, and SDH signals.

[0010] The existing SDH equipment in the network is gradually replaced by the converged transmission equipment. The converged transmission equipment is interconnected with the core layer network through STM-1, STM-4, STM-16 channels and GE and FE channels using a split dynamic adaptation interconnection mechanism.

[0011] When all existing SDH devices in the aggregation layer are replaced with the converged transmission devices, and the core layer network supports fgODUflex signal scheduling, the aggregation layer network and the core layer network are interconnected through a unified OTN and fgOTN protocol channel, and all services are carried through fgODUflex and ODUk containers.

[0012] Furthermore, when deploying converged transmission equipment that supports multi-standard processing at the hub node, an interconnection channel supporting fgODUflex is established between the converged transmission equipment at different sites to form an initial fgOTN service plane.

[0013] Furthermore, the standard SDH interface includes STM-4, STM-16 and STM-64 optical interfaces, and the fgODU interface is a 100G OTU4 optical interface.

[0014] Furthermore, when gradually replacing the existing SDH equipment with the converged transmission equipment, the converged transmission equipment is interconnected through the fgOTN protocol channel, and the converged transmission equipment is interconnected with the existing SDH equipment through the SDH protocol channel.

[0015] Furthermore, the split-path dynamic adaptation interconnection mechanism includes carrying TDM services through the STM-1, STM-4, and STM-16 channels, and carrying packet services through the GE and FE channels.

[0016] Furthermore, the split-path dynamic adaptation interconnection mechanism is replaced by a unified OTN and fgOTN protocol channel after the core layer network supports fgODUflex signal scheduling.

[0017] Furthermore, the unified OTN and fgOTN protocol channels are gray-light 10G / 100G fgODU channels.

[0018] Furthermore, after all the existing SDH equipment in the aggregation layer is replaced with the converged transmission equipment, the converged transmission equipment within the aggregation layer network is interconnected through the gray optical 10G / 100G fgODU channel to form a complete fgOTN plane.

[0019] Furthermore, the converged transmission equipment contains a unified cross-connect matrix for protocol mapping and service scheduling between service interfaces and channels of different standards.

[0020] Secondly, this invention proposes a power communication network evolution system based on fgOTN, comprising:

[0021] The node selection module is used to select the aggregation site and the site carrying the target service in the target area as hub nodes based on the existing network topology and service distribution of the target area; the existing network topology includes an aggregation layer network equipped with existing SDH equipment and a core layer network equipped with OTN equipment;

[0022] The pilot module is used to deploy a converged transmission device supporting multi-standard signal processing at the hub node, interconnect the converged transmission device with existing SDH equipment via a standard SDH interface, and interconnect the converged transmission device with existing OTN equipment via an fgODU interface; the multi-standard signals include fgOTN, OTN, and SDH signals;

[0023] The hybrid networking module is used to gradually replace the existing SDH equipment with the converged transmission equipment. It adopts a split dynamic adaptation interconnection mechanism to interconnect the aggregation layer network where the converged transmission equipment is located with the core layer network through STM-1, STM-4, STM-16 channels and GE and FE channels.

[0024] The network module is used to interconnect the aggregation layer network and the core layer network through a unified OTN and fgOTN protocol channel when all existing SDH equipment in the aggregation layer is replaced with the converged transmission equipment and the core layer network supports fgODUflex signal scheduling, and to carry all services through fgODUflex and ODUk containers.

[0025] The beneficial effects achieved by this invention are as follows:

[0026] This invention proposes a three-stage dynamic evolution method. In the initial pilot stage, compatible converged transmission equipment is connected to achieve lossless access to technical services. In the mid-term hybrid networking stage, a dynamic adaptation and interconnection mechanism is adopted, where TDM services continue to be uploaded through the STM-1 / 4 / 16 interface, while packet services such as Ethernet are uploaded through the GE / FE interface, solving the problem of service interoperability. In the target network stage, a unified OTN / fgOTN protocol plane is used to eliminate protocol conversion overhead and the architectural complexity of the interconnection, achieving a fundamental improvement in network performance, operation and maintenance efficiency, resource utilization, and architectural simplicity. Attached Figure Description

[0027] Figure 1 This is a flowchart of a power communication network evolution method based on fgOTN proposed in this invention;

[0028] Figure 2 This is a schematic diagram of a preferred network architecture for the early pilot stage of the evolution of the city-level optical transmission network.

[0029] Figure 3 This is a schematic diagram of a preferred network architecture for the hybrid networking stage in the mid-term evolution of the optical transmission network at the city-level convergence layer.

[0030] Figure 4 This is a schematic diagram of a preferred architecture of the present invention in the fgOTN network formation stage of the city-level convergence layer optical transmission network evolution.

[0031] Figure labels: 11. Existing SDH equipment, 12. Existing OTN equipment, 13. Converged transmission equipment, 21. 40*10G OTN channel, 22. STM-64 channel, 23. STM-1 / 4 / 16 channel, 24. GE / FE channel, 25. Gray optical 10G / 100G fgODU channel, 26. Gray optical 10G / 100G hybrid channel. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0033] Example 1, as Figure 1As shown, this invention discloses a power communication network evolution method based on fgOTN, comprising:

[0034] Based on the existing network topology and service distribution, county companies and 500kV / 220kV substations carrying the target services are selected as hub nodes; the target services are production control services in safety zone I / II; the existing network topology includes an aggregation layer network equipped with existing SDH equipment and a core layer network equipped with OTN equipment.

[0035] A converged transmission device supporting multi-standard signal processing is deployed at the hub node. This converged transmission device is interconnected with existing SDH devices via a standard SDH interface and with existing OTN devices via an fgODU interface. The converged transmission device is a ZXMP M721 CX66A(E) device. The multi-standard signals include fgOTN (fine-grain optical transport network), OTN (optical transport network), and SDH (synchronous digital hierarchy). The focus of this step is on technical verification and lossless service access, used to verify the adaptability of the converged transmission device after its introduction into the existing network while ensuring that the transmission paths, protocol stacks, and performance indicators of all existing services remain unchanged.

[0036] The existing SDH equipment will be gradually replaced by the converged transmission equipment. A split-path dynamic adaptation interconnection mechanism will be adopted to interconnect the aggregation layer network where the converged transmission equipment is located with the core layer OTN network through STM-1, STM-4, STM-16 channels and GE (Gigabit Ethernet) and FE (Fast Ethernet) channels. The key point of this step is to solve the problem of protocol mismatch between the aggregation layer and the core layer, avoid the compatibility and service interruption risks of strong coupling upgrades when the core layer protocol stack is not ready, make full use of the existing and stable client-side service interfaces of the core layer equipment, ensure the end-to-end reachability and quality of service of all heterogeneous services during the hybrid networking transition period, and achieve a smooth evolution of the target technology.

[0037] When all existing SDH equipment in the aggregation layer is replaced with the converged transmission equipment, and the core layer OTN network supports fgODUflex signal scheduling, the aggregation layer network and the core layer network are interconnected through a unified OTN and fgOTN protocol channel, and all services are carried through fgODUflex (fine-grained optical data unit Flex) and ODUk (optical channel data unit) containers.

[0038] When deploying converged transmission equipment that supports multi-standard processing at the hub node, an interconnection channel supporting fgODUflex is established between the converged transmission equipment at different sites to form the initial fgOTN service plane.

[0039] The standard SDH interface includes STM-4, STM-16 and STM-64 optical interfaces, and the fgODU interface is a 100GOTU4 optical interface.

[0040] When gradually replacing the existing SDH equipment with the converged transmission equipment, the converged transmission equipment is interconnected through the fgOTN protocol channel, and the converged transmission equipment is interconnected with the existing SDH equipment through the SDH protocol channel.

[0041] The split-path dynamic adaptation interconnection mechanism includes carrying TDM services through the STM-1, STM-4, and STM-16 channels, and carrying packet services through the GE and FE channels.

[0042] The split-path dynamic adaptation interconnection mechanism is triggered and enabled when the core layer OTN network does not yet support fgODUflex signal scheduling, and is replaced by a unified OTN and fgOTN protocol channel after the core layer OTN network completes the protocol upgrade.

[0043] The unified OTN and fgOTN protocol channels are gray-light 10G / 100G fgODU channels.

[0044] After all the existing SDH equipment in the aggregation layer is replaced with the converged transmission equipment, the converged transmission equipment within the aggregation layer network is interconnected through gray optical 10G / 100G fgODU channels to form a complete fgOTN plane.

[0045] The converged transmission equipment contains a unified cross-connect matrix, which is used for protocol mapping and service scheduling between service interfaces and channels of different standards.

[0046] Example 2, based on the same inventive concept as Example 1, provides a method for the evolution of power communication networks based on fgOTN, proceeding in the following layers: First, in the initial pilot phase, by deploying converged transmission equipment supporting multi-mode configuration, accessing the existing SDH plane using the standard SDH protocol, and constructing a preliminary fgOTN channel, technical verification and new service carrying are completed while ensuring zero interruption of existing network services; Second, by adopting a scheme of STM-1 / 4 / 16 and GE / FE split interconnection, the problem of protocol mismatch between the aggregation layer and the core layer is solved, forming a transitional form in which the old and new SDH ring network equipment are mixed, and VC (Virtual Container) and ODUk channels coexist; Finally, in the target network architecture phase, after the entire ring equipment is replaced, the mixed channel is upgraded to an fgODU channel, building a new generation of aggregation layer optical transmission network with a simplified architecture that can uniformly carry various types of services of different sizes.

[0047] like Figure 2 As shown, in the initial pilot phase of the evolution of the city-level optical transmission network, the focus is on verifying the compatibility of the new platform with existing network equipment and the ability to migrate services without loss. A converged transmission device 13 is deployed at selected sites. Its key feature is its support for simultaneously configuring VC / fgOTN service interface cards. The converged transmission device 13 interconnects with the existing SDH equipment 11 via STM-64 channel 22 using an SDH frame structure. For the existing SDH equipment 11, the converged transmission device 13 conforms to the SDH network element standard. By achieving lossless, protocol-free transparent transmission of existing VC services, the compatibility of the converged transmission device 13 and the existing SDH equipment 11 at the interface layer is verified. Furthermore, the software capabilities of the core layer A-network OTN equipment in the pilot area are upgraded to enable interconnection with the converged transmission device via the gray-light 10G / 100G fgODU channel 25. Simultaneously, between sites where the converged transmission device 13 is also deployed, the fgOTN mode is enabled, constructing a new plane carrying the fgODUflex / ODUk protocol via the gray-light 10G / 100G hybrid waveguide channel 26. This phase verifies the ability of the converged equipment to simultaneously process and bridge two independent protocol stacks, SDH VC and fgOTN ODU, on a single hardware platform, as well as the compatibility of the converged transmission equipment with existing network equipment, laying the technical foundation for subsequent hybrid networking.

[0048] After the pilot phase, it will enter the following stage: Figure 3The intermediate hybrid networking phase, as shown, presents a complex network landscape where new and old devices coexist with multiple protocols. The key to this phase lies in resolving the issues of converged transport of heterogeneous protocol service flows and differentiated uplink performance. When the existing SDH equipment 11 is gradually replaced using converged transmission equipment 13, to maintain interoperability between the converged transmission equipment 13 and the unreplaced SDH equipment, the old and new equipment are interconnected via STM-64 channel 22 based on the SDH protocol, while the converged transmission equipment 13 is interconnected via gray-optical 10G / 100G fgODU channel 25. At this time, to avoid large-scale collaborative upgrades to the existing OTN equipment 12 in the core layer and to reduce transition risks and impact, an STM-64, GE / FE split-path interconnection structure is adopted between the aggregation layer and the core layer. Differential adaptation is achieved using the existing client-side service interfaces of the existing OTN equipment 12 in the core layer: traditional E1, VC-4, and other TDM services inherited and accessed from the aggregation layer are uploaded via STM-1 / 4 / 16 channel 23; newly added Ethernet and other packet services in the aggregation layer are uploaded via GE / FE channel 24. Without requiring major modifications to the core layer protocol stack, end-to-end reachability of all types of services can be achieved during hybrid networking.

[0049] Ultimately, the network will evolve to the point where... Figure 4 The diagram shows the fgOTN network deployment phase. At this stage, all network equipment in the regional aggregation layer A plane is upgraded to converged transmission equipment 13, and the core layer OTN network also completes software upgrades and activates the scheduling capability for fgODUflex signals. During this phase, the aggregation layer A plane equipment is interconnected only through gray optical 10G / 100G fgODU channels 25, simplifying the network structure. All services carried on the aggregation layer A plane are uniformly mapped to fgODU / ODUk containers for transmission. Services from the aggregation layer A plane are transmitted from the county company and the second aggregation point to the core layer A plane via gray optical 10G / 100G fgODU channels 25. Through the fgOTN protocol connection established between the aggregation layer and the core layer, the latency and jitter caused by protocol conversion and splitting interfaces in the mid-term phase are eliminated, improving end-to-end service performance and simplifying network configuration, management, and fault location.

[0050] In summary, the power communication network evolution method based on fgOTN of this invention can gradually and losslessly replace old SDH and OTN equipment through hybrid networking and phased transformation, while ensuring zero interruption of existing network services. Ultimately, it can build a new generation of fgOTN target network with a simplified architecture that can uniformly and efficiently carry full-granularity services from 2M to 100G, systematically solving industry problems such as network bandwidth bottlenecks, complex equipment stacking, difficult operation and maintenance, and high risks of technology upgrades.

[0051] Example 3, based on the same inventive concept as Example 1, provides a power communication network evolution system based on fgOTN, comprising:

[0052] The node selection module is used to select the aggregation site and the site carrying the target service in the target area as hub nodes based on the existing network topology and service distribution of the target area; the existing network topology includes an aggregation layer network equipped with existing SDH equipment and a core layer network equipped with OTN equipment;

[0053] The pilot module is used to deploy a converged transmission device supporting multi-standard signal processing at the hub node, interconnect the converged transmission device with existing SDH equipment via a standard SDH interface, and interconnect the converged transmission device with existing OTN equipment via an fgODU interface; the multi-standard signals include fgOTN, OTN, and SDH signals;

[0054] The hybrid networking module is used to gradually replace the existing SDH equipment with the converged transmission equipment. It adopts a split dynamic adaptation interconnection mechanism to interconnect the aggregation layer network where the converged transmission equipment is located with the core layer OTN network through STM-1, STM-4, STM-16 channels and GE and FE channels.

[0055] The network module is used to interconnect the aggregation layer network and the core layer network through a unified OTN and fgOTN protocol channel when all existing SDH equipment in the aggregation layer is replaced with the converged transmission equipment and the core layer OTN network supports fgODUflex signal scheduling, and to carry all services through fgODUflex and ODUk containers.

[0056] The converged transmission equipment contains a unified cross-connect matrix. The pilot module, hybrid networking module, and network module all use the cross-connect matrix to achieve protocol mapping and service scheduling between different standard service interfaces and channels.

[0057] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0058] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0059] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0060] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0061] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. A method for power communication network evolution based on fgOTN, characterized in that, include: Based on the existing network topology and service distribution of the target area, the aggregation sites and sites carrying the target services in the target area are selected as hub nodes; the existing network topology includes an aggregation layer network equipped with existing SDH equipment and a core layer network equipped with OTN equipment; A converged transmission device supporting multi-standard signal processing is deployed at the hub node. The converged transmission device is interconnected with the existing SDH equipment through a standard SDH interface and with the existing OTN equipment through an fgODU interface. The multi-standard signals include fgOTN, OTN, and SDH signals. The existing SDH equipment in the network is gradually replaced by the converged transmission equipment. The converged transmission equipment is interconnected with the core layer network through STM-1, STM-4, STM-16 channels and GE and FE channels using a split dynamic adaptation interconnection mechanism. When all existing SDH devices in the aggregation layer are replaced with the converged transmission devices, and the core layer network supports fgODUflex signal scheduling, the aggregation layer network and the core layer network are interconnected through a unified OTN and fgOTN protocol channel, and all services are carried through fgODUflex and ODUk containers.

2. The power communication network evolution method based on fgOTN according to claim 1, characterized in that, When deploying converged transmission equipment that supports multi-standard processing at the hub node, an interconnection channel supporting fgODUflex is established between the converged transmission equipment at different sites to form the initial fgOTN service plane.

3. The power communication network evolution method based on fgOTN according to claim 1, characterized in that, The standard SDH interface includes STM-4, STM-16 and STM-64 optical interfaces, and the fgODU interface is a 100G OTU4 optical interface.

4. The power communication network evolution method based on fgOTN according to claim 1, characterized in that, When gradually replacing the existing SDH equipment with the converged transmission equipment, the converged transmission equipment is interconnected through the fgOTN protocol channel, and the converged transmission equipment is interconnected with the existing SDH equipment through the SDH protocol channel.

5. The power communication network evolution method based on fgOTN according to claim 1, characterized in that, The split-path dynamic adaptation interconnection mechanism includes carrying TDM services through the STM-1, STM-4, and STM-16 channels, and carrying packet services through the GE and FE channels.

6. The power communication network evolution method based on fgOTN according to claim 5, characterized in that, The aforementioned dynamic adaptation interconnection mechanism was replaced by a unified OTN and fgOTN protocol channel after the core layer network supported fgODUflex signal scheduling.

7. The power communication network evolution method based on fgOTN according to claim 1, characterized in that, The unified OTN and fgOTN protocol channels are gray-light 10G / 100G fgODU channels.

8. The power communication network evolution method based on fgOTN according to claim 7, characterized in that, After all the existing SDH equipment in the aggregation layer is replaced with the converged transmission equipment, the converged transmission equipment within the aggregation layer network is interconnected through the gray optical 10G / 100G fgODU channel to form a complete fgOTN plane.

9. The power communication network evolution method based on fgOTN according to claim 1, characterized in that, The converged transmission equipment contains a unified cross-connect matrix, which is used for protocol mapping and service scheduling between service interfaces and channels of different standards.

10. A power communication network evolution system based on fgOTN, characterized in that, include: The node selection module is used to select the aggregation site and the site carrying the target service in the target area as hub nodes based on the existing network topology and service distribution of the target area; the existing network topology includes an aggregation layer network equipped with existing SDH equipment and a core layer network equipped with OTN equipment; The pilot module is used to deploy a converged transmission device supporting multi-standard signal processing at the hub node, interconnect the converged transmission device with existing SDH equipment via a standard SDH interface, and interconnect the converged transmission device with existing OTN equipment via an fgODU interface; the multi-standard signals include fgOTN, OTN, and SDH signals; The hybrid networking module is used to gradually replace the existing SDH equipment with the converged transmission equipment. It adopts a split dynamic adaptation interconnection mechanism to interconnect the aggregation layer network where the converged transmission equipment is located with the core layer network through STM-1, STM-4, STM-16 channels and GE and FE channels. The network module is used to interconnect the aggregation layer network and the core layer network through a unified OTN and fgOTN protocol channel when all existing SDH equipment in the aggregation layer is replaced with the converged transmission equipment and the core layer network supports fgODUflex signal scheduling, and to carry all services through fgODUflex and ODUk containers.

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