Optical Network CID Correction for Synchronization
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Solution Overview
Problem
Optical networks face challenges in maintaining synchronous timing due to consecutive identical digits (CIDs) exceeding threshold lengths, which can lead to data loss and disruption, especially when malicious attacks exploit vulnerabilities in scrambling functions to induce CID errors.
Innovation Solution
Implementing a method that encapsulates and scrambles data packets in passive optical networks (PONs) to detect and correct CID sequences exceeding a threshold length by replacing them with correction patterns, ensuring continuous bit transitions and preventing timing synchronization loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data packets are scrambled using standard PON scrambling functions, then the occurrence of long runs of ones or zeros is reduced, but malicious attacks can still exploit vulnerabilities to induce consecutive identical digits (CIDs) that exceed threshold lengths and disrupt timing synchronization
Solution Approach 1:
The patent applies preliminary action by performing CID detection and correction before data transmission. The system proactively identifies potential CID sequences that could disrupt synchronization and replaces them with correction patterns beforehand, preventing the harmful effect from occurring during actual data transfer.
Solution Approach 2:
The patent introduces an intermediary mechanism - a CID correction module that acts as a mediator between the scrambler and the transmission channel. This intermediary detects and corrects CID sequences by replacing them with predefined correction patterns, thereby protecting the timing synchronization from malicious attacks without requiring changes to the fundamental scrambling function.
2Device complexity
If standard PON scrambling functions are used without additional protection, then device complexity is minimized, but the system becomes vulnerable to malicious attacks that leverage scrambling vulnerabilities to cause CID errors
Solution Approach 1:
The patent segments the data transmission process into distinct functional modules: standard PON scrambling function, CID detection module, and CID correction module. This segmentation allows the system to maintain the simplicity of the original scrambling function while adding targeted protection mechanisms that operate independently on the scrambled output.
Solution Approach 2:
The system implements self-service by having the CID correction module autonomously detect and correct CID sequences in the scrambled data without requiring external intervention. The correction module uses predefined correction patterns and threshold comparisons to automatically identify and remediate problematic sequences, maintaining system simplicity while enhancing security.
Data Source
AI summary
An example method includes encapsulating, by an optical network device, at least a portion of a data packet to form a passive optical network (PON) frame. The method further includes applying, by the optical network device, a scrambling polynomial to at least a portion of the PON frame to generate a scrambled PON frame. The method further includes determining, by the optical network device, that the scrambled PON frame comprises a consecutive identical digit (CID) sequence greater than a threshold length. The method further includes replacing, by the optical network device the determined CID sequence with a correction pattern to generate a modified scrambled PON frame. The method further includes transmitting, by the optical network device, the modified scrambled PON frame.