Codeword Synchronization Using 100-Bit Pattern Detection
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Solution Overview
Problem
Current Fiber Channel protocol methods for codeword synchronization are inefficient, particularly in normal mode, requiring up to 1 millisecond for synchronization and impacting performance, while rapid synchronization in Low Power Idle mode compromises DC balance and has a limited detection window.
Innovation Solution
The method identifies codeword boundaries by detecting 100-bit known patterns within each 5280-bit codeword, utilizing the first 5 bits of every 257-bit transmission word to reduce synchronization time and simplify the process, allowing for both normal and rapid synchronization without bypassing the scrambler, and extending the detection window.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If normal codeword synchronization uses syndrome calculation for 5280 bit codewords, then synchronization accuracy is maintained, but synchronization time increases up to 1 millisecond
Solution Approach 1:
The patent divides the 5280-bit codeword into multiple 257-bit transmission words and further segments the synchronization detection into parallel operations across multiple candidate positions. By processing multiple segments simultaneously rather than sequentially checking each position, the system maintains detection accuracy while reducing overall synchronization time from 1ms to approximately 100 microseconds.
Solution Approach 2:
The patent performs preliminary synchronization by detecting known patterns in the first few transmission words before complete codeword validation is required. This preliminary detection establishes candidate boundary positions that guide subsequent full codeword verification, eliminating the need to exhaustively check all 5280 bit positions and significantly reducing synchronization time.
2Loss of time
If rapid synchronization is used in LPI mode, then synchronization time is reduced, but DC balance is compromised due to scrambler bypass
Solution Approach 1:
The patent applies partial synchronization action by detecting known patterns in only the first few transmission words (e.g., first 100 bits) rather than processing the entire codeword. This partial detection is sufficient to identify candidate boundary positions and achieve rapid synchronization without requiring complete codeword validation, reducing time from 1ms to 100 microseconds while maintaining scrambler operation for DC balance.
3Productivity
If the detection window is kept small for rapid synchronization, then synchronization speed increases, but reliability decreases due to limited detection range
Solution Approach 1:
The patent extends the detection capability by utilizing the temporal dimension of multiple transmission words. Instead of relying solely on a small spatial window within a single codeword, the system detects known patterns across the first several transmission words (covering 100+ bits), creating a extended detection window that maintains high reliability while enabling rapid synchronization through parallel processing.
Data Source
AI summary
Efficient codeword synchronization methods and systems for fiber channel protocol are disclosed. The method includes identifying a codeword boundary by detecting 100-bit known patterns in a bit codeword in a transmission.