OTU Frame Generating Device for 100G Ethernet Multiplexing
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Solution Overview
Problem
Current OTN frameworks face challenges in accommodating and transmitting 100 Gbps Ethernet signals and multiple signal types with lower bit rates efficiently, as they require advanced frame multiplexing and error correction mechanisms.
Innovation Solution
A frame generating device is designed with an inserting portion that adds fixed stuff bytes to the payload area of OTU frames, allowing for the accommodation and transmission of 100 Gbps Ethernet signals and multiple signal types, including ODU3, ODU2, ODU1, and ODU2e, by treating multiple frames as a single multi-frame period, thereby optimizing bit rate and error correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the OTN frame structure is designed to accommodate 100 Gbps Ethernet signals, then the transmission capacity is improved, but the frame structure complexity increases
Solution Approach 1:
The patent segments the payload area into fixed stuff byte regions and flexible client signal regions. The fixed stuff bytes are inserted at specific positions (e.g., bytes 1-8 in the first row) to provide structured organization, while the remaining payload area accommodates client signals. This segmentation allows the frame to handle 100 Gbps Ethernet signals by providing a clear structural framework that simplifies the accommodation process despite the high capacity requirement.
2Adaptability or versatility
If multiple signal types with different bit rates are multiplexed in the OTN frame, then the versatility is improved, but the difficulty of frame multiplexing increases
Solution Approach 1:
The patent applies local quality by assigning different characteristics to different regions of the payload area. Fixed stuff bytes are placed in specific locations with defined properties (e.g., 8 bytes in the first row), while other regions are allocated for different client signal types based on their bit rate requirements. This allows ODU3, ODU2, ODU1, and ODU2e signals to be accommodated in appropriate regions, simplifying the multiplexing process by providing localized accommodation zones for each signal type.
3Reliability
If fixed stuff bytes are inserted into the payload area, then the error correction capability is improved, but the usable payload area is reduced
Solution Approach 1:
The patent implements partial action by inserting fixed stuff bytes only in specific regions of the payload area rather than throughout the entire payload. For example, 8 bytes are allocated in the first row for fixed stuff bytes, while the remaining payload area is available for client signals. This partial allocation provides error correction capability where most needed while preserving maximum usable payload area for data transmission.
Data Source
Figure 1A~1B
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AI summary
A frame generating device includes an inserting portion and an accommodating portion. The inserting portion inserts a first fixed stuff byte and a second fixed stuff byte into a payload area of an OTU frame, the first fixed stuff byte being of (8 + 10n ("n" is zero or a given positive integer)) X 4 rows, the second fixed stuff byte being of a given byte X 4 rows, the given byte being equal to zero or more and being equal to (24 - 10n) or more. The accommodating portion accommodates Ethernet signal in the payload area other than the first fixed stuff byte and the second fixed stuff byte.