Block-Code Transcoding With Explicit Control Word Mapping
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Solution Overview
Problem
Current block-code transcoding methods in Optical Transport Networks (OTNs) are not bandwidth efficient, leading to increased latency and error rates due to address chaining and overhead requirements, which are undesirable for reliable signal transmission.
Innovation Solution
A system and method for block-code transcoding that uses explicit control word location mapping instead of address chaining, allowing for more efficient encoding and decoding with reduced latency by distributing control information throughout the block, thereby improving robustness and bandwidth efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If address chaining is used to identify control information locations, then control information can be positioned flexibly, but error propagation increases because an errored bit corrupts multiple bytes
Solution Approach 1:
The patent segments the control information structure by introducing explicit location fields for each control word within the 512-byte block, rather than using chained addressing. Each control word's position is independently specified, breaking the error propagation chain that exists in address chaining where one error can corrupt multiple subsequent bytes.
2Device complexity
If all control information is positioned at the beginning of the block, then addressing becomes simpler, but transmission latency increases
Solution Approach 1:
The patent introduces a new dimensional approach by including explicit location indicators within the block structure itself. Rather than all control information being positioned at the beginning (one-dimensional approach), the system allows control words to be distributed throughout the 512-byte block with each position explicitly marked, adding the dimension of distributed positioning with explicit addressing.
3Reliability
If 8 B/10 B coding is used for transmission, then signal integrity is maintained, but bandwidth efficiency decreases due to 25% overhead
Solution Approach 1:
The patent changes the block size parameter from the traditional 8-byte blocks used in 8 B/10 B coding to 512-byte blocks. This parameter change allows for more efficient packing of data and control information, reducing the relative overhead while maintaining the signal integrity benefits of block coding. The larger block size enables better utilization of the available bandwidth.
4Adaptability or versatility
If G.7041 and G.709 coding methods are used, then transcoding between different block codes is enabled, but latency increases due to processing requirements
Solution Approach 1:
The patent performs preliminary organization of control information within the 512-byte block structure before transmission. By pre-positioning control words with explicit location indicators and pre-organizing the block format, the system reduces the processing latency required at the receiving end for transcoding operations, as the structure is already optimized for efficient extraction and processing.
Data Source
AI summary
A system and method for block-code transcoding. An input signal is analyzed to determine if the input signal includes multiple control words, multiple data words and a single control word or only data words. If the input signal comprises multiple control words, the method includes, generating a control word location map and mapping the control codes and any data words to a block-code encoded transmission signal. If the input signal comprises a single control word and multiple data words, the method includes, generating a control word location address indicating a location of the single control word and mapping the control code and the multiple data words to a block-code encoded transmission signal. If the input signal comprises only data words, the method includes, mapping the data words sequentially into the block-code encoded transmission signal. Accordingly, the bandwidth efficiency of the transmission signal is improved by varying the encoding technique used dependent upon the contents of the input signal.