Low-Rate ODU Mapping for OTN Bandwidth Efficiency
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Solution Overview
Problem
Current Optical Transport Network (OTN) technologies face challenges in efficiently transmitting low-rate traffic signals, such as Gigabit Ethernet (GE) and Fiber Connection (FC), due to high bandwidth waste, complex circuitry, and inability to implement point-to-point performance monitoring and flexible traffic management for low-rate signals.
Innovation Solution
The method involves mapping low-rate traffic signals to a defined Optical Channel Data Unit (ODUGE) frame format, using GFP mapping and asynchronous multiplexing to adapt these signals to match the OTN's transmission rate, enabling efficient bandwidth utilization and point-to-point management within the OTN.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If low-rate traffic signals are transmitted using conventional OTN methods, then transmission can be achieved, but bandwidth utilization is poor and bandwidth waste is high
Solution Approach 1:
The invention segments the OTN frame structure to create a dedicated low-rate ODU signal type (ODU0) specifically for low-rate traffic. This segmentation allows low-rate signals to occupy only the necessary bandwidth portion rather than being forced into higher-rate containers, thereby reducing bandwidth waste and improving utilization efficiency.
Solution Approach 2:
The invention changes the parameter of signal rate compatibility by defining ODU0 with a specific bit rate (1244.160 Mbps) that matches low-rate traffic requirements. This parameter change enables direct mapping of low-rate signals without excessive bandwidth allocation, resolving the contradiction between bandwidth waste and utilization.
2Ease of manufacture
If low-rate traffic signals are mapped to conventional OTN structures, then transmission is possible, but circuit complexity increases
Solution Approach 1:
The invention creates a universal ODU0 frame structure that can handle various low-rate traffic types (Ethernet, FC, and other low-rate signals) through a single standardized interface. This multi-functionality eliminates the need for separate complex mapping circuits for different low-rate signal types, thereby simplifying the overall circuit design.
Solution Approach 2:
The ODU0 frame structure serves as an intermediary that simplifies the mapping process between diverse low-rate signals and the OTN transport network. By introducing this standardized intermediate structure, the invention reduces the complexity of direct mapping circuits while maintaining ease of implementation.
3Reliability
If conventional OTN mapping is used for low-rate signals, then signals can be transmitted, but point-to-point performance monitoring is not available
Solution Approach 1:
The invention incorporates dedicated overhead bytes (PM, TCM, GCC) in the ODU0 frame structure that provide feedback mechanisms for performance monitoring. These overhead bytes enable automatic detection and reporting of signal quality, errors, and status, thereby providing point-to-point performance monitoring capability while maintaining ease of operation through automated management.
4Adaptability or versatility
If conventional OTN structures are used, then transmission framework is established, but flexible traffic management and uploading/downloading is not possible
Solution Approach 1:
The invention introduces dynamic traffic management capabilities through the ODU0 frame structure, allowing flexible allocation and reconfiguration of low-rate traffic channels. The overhead bytes enable dynamic monitoring and control, permitting traffic to be uploaded or downloaded at intermediate nodes based on network conditions and requirements, thereby achieving adaptability while maintaining operational simplicity.
Data Source
AI summary
A method for low-rate signal transmission on Optical Transport Networks is provided. In the method, a signal is mapped to a low-rate OPU of a low-rate ODU, wherein the low-rate ODU comprises an ODU overhead section and the low-rate OPU, the low-rate OPU comprises an OPU overhead section and an OPU payload section, the low-rate ODU has a bit rate of 1, 244, 160 Kbps±20 ppm, and the OPU payload section has a bit rate of 1, 238, 954.31 Kbps±20 ppm; OPU overhead bytes and ODU overhead bytes are added to corresponding overhead section; then, the low-rate ODU is multiplexed to an Optical channel Data Unit-k (ODUk) that has a bit rate higher than the bit rate of the low-rate ODU; finally, the ODUk is transmitted via the OTN.