Single Data Path Client Signal Mapping for OTN
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Solution Overview
Problem
Conventional Optical Transport Network (OTN) systems face inefficiencies in mapping diverse client signals due to the need for separate data paths and unpredictable logic capacity, which limits high-integration and high-capacity implementations.
Innovation Solution
A client signal mapping apparatus and method that uses a single data path to map client signals by determining address differences, deciding the number of client data to be mapped, and adjusting data positions, incorporating down-shifters, encoders, and variable shifters to accommodate various client signals without separate data paths for each signal type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate data paths are used for different client signals, then each signal type can be mapped independently, but device complexity and logic capacity requirements increase
Solution Approach 1:
The patent implements a universal data path that can handle multiple client signal types (STM-16, STM-64, STM-256, and 40-Gbps Ethernet) through a single unified mapping structure. The GMP (Generic Mapping Procedure) enables this single data path to adaptively map different client signals by dynamically adjusting mapping parameters such as Cm (number of client data bytes) and CnD (number of client data bits), eliminating the need for separate dedicated data paths for each signal type.
Solution Approach 2:
The mapping apparatus employs dynamic adjustment mechanisms where the number of client data bytes (Cm) and bits (CnD) can be flexibly changed based on the input signal type and rate. This dynamic capability allows the same data path to adapt to varying client signal requirements without reconfiguration or additional hardware, resolving the contradiction between versatility and complexity.
2Reliability
If separate data paths are provided for each client signal type, then mapping can be optimized for each signal, but logic capacity becomes unpredictable and high-integration is limited
Solution Approach 1:
The patent maintains mapping accuracy by dynamically changing parameters (Cm and CnD values) rather than creating separate data paths. The system adjusts these parameters based on the client signal characteristics, ensuring optimal mapping performance for each signal type while keeping the underlying data path structure unified and predictable, thus reducing logic capacity requirements.
3Ease of manufacture
If fixed stuff byte areas are used for rate differences, then simple mapping is achieved, but adaptability to diverse client signals is limited
Solution Approach 1:
The patent replaces fixed stuff byte areas with a dynamic GMP structure where the number of data bytes (Cm) and bits (CnD) can be adjusted based on the client signal type and rate. This dynamic approach maintains the simplicity of the mapping structure while significantly improving adaptability to diverse client signals including STM-16, STM-64, STM-256, and 40-Gbps Ethernet.
4Productivity
If multiple data paths are implemented for high-capacity implementations, then throughput increases, but device complexity and power consumption increase
Solution Approach 1:
The patent achieves high throughput for 40-Gbps and other client signals using a single universal data path with dynamic parameter adjustment. This approach maintains high productivity by efficiently utilizing the data path capacity while avoiding the device complexity and power consumption associated with implementing multiple parallel data paths.
Data Source
AI summary
Disclosed are an apparatus and a method for mapping an SDH signal and other 40-Gbps client signals through a single data path. The mapping apparatus supports both a justification byte mapping scheme and a sigma-delta distribution mapping scheme and implements a single data path. Accordingly, power consumption may be reduced by changing each mapping mode in a hitless manner or minimizing logic capacity according to a mapping mode used in the mapping apparatus.