FEC Error Mapping for Uncorrectable Codeword Search
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Solution Overview
Problem
Conventional error rate measuring apparatuses face difficulties in recognizing error distribution by FEC symbol length and cannot automatically search for uncorrectable codewords, leading to inefficient debugging due to manual effort and time consumption.
Innovation Solution
An error rate measuring apparatus that inputs NRZ or PAM4 signals to a device under test, sets FEC symbol length and error thresholds, counts FEC symbol errors, and displays them in codeword units, enabling automatic search and identification of uncorrectable codewords through a user-friendly interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional error mapping function is used to display bit error positions, then bit-level error identification is possible, but error distribution by FEC symbol length and uncorrectable codeword identification cannot be achieved
Solution Approach 1:
The patent segments the continuous bit error data into discrete FEC symbol units and codeword units. By dividing the error data stream into segments corresponding to FEC symbol lengths and codeword boundaries, the system can analyze error distribution at multiple hierarchical levels (bit level, FEC symbol level, and codeword level), enabling precise measurement of error patterns while maintaining manageable data structure through systematic segmentation.
2Productivity
If manual search method is used to find uncorrectable codewords, then flexibility in investigation is maintained, but time consumption and debugging efficiency deteriorate
Solution Approach 1:
The patent implements self-service functionality by enabling the error rate measuring apparatus to automatically identify and highlight uncorrectable codewords without requiring manual intervention. The system autonomously compares received signals against FEC decoding rules, automatically detects codewords exceeding error thresholds, and presents results through the display unit, thereby eliminating time-consuming manual search processes while maintaining investigation flexibility.
3Extent of automation
If FEC symbol error counting is implemented to identify uncorrectable codewords, then automatic search capability is achieved, but device complexity and processing requirements increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring FEC symbol length parameters and error threshold values before the actual error measurement process begins. The operation unit stores predetermined FEC decoding rules and codeword structures, enabling the error counting means to automatically compare received signals against these pre-established criteria. This preliminary setup reduces real-time processing complexity while achieving comprehensive automatic identification of uncorrectable codewords.
Data Source
AI summary
An error rate measuring apparatus includes: an operation unit that sets a codeword length, an FEC symbol length, and an FEC symbol error threshold; error counting unit for counting FEC symbol error and an uncorrectable codeword; a display unit that performs display by setting one zone of a display area as one FEC symbol length, matching a zone length of a horizontal axis of the display area with one codeword length, and performing line feed in codeword length units according to presence or absence of the FEC symbol error in FEC symbol length units based on a counting result; search unit for searching for the uncorrectable codeword starting from the cursor on the identification display; and display control unit for performing display control of the cursor at a position of a head error of the searched uncorrectable codeword.