Scrambler Offset Packet Transmission for PON Line Pattern Quality
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Solution Overview
Problem
Passive optical networks (PONs) face issues with residual bit errors due to long runs of identical digits and are vulnerable to intentional attacks that disrupt the line pattern, leading to transmission failures.
Innovation Solution
Implementing pre-transmit logic that delays packet transmission until the scrambling sequence meets threshold line pattern criteria, using idle patterns to improve line pattern quality and protect against malicious attacks, without altering the line protocol.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a scrambler is used to condition the transmitted bit pattern, then transmission efficiency is improved, but the system becomes vulnerable to intentional attacks and residual bit errors
Solution Approach 1:
The system performs preliminary evaluation of line pattern criteria before packet transmission. The pre-transmit logic determines whether a scrambling sequence complies with threshold line pattern criteria and delays transmission if necessary, preventing vulnerable packets from entering the network while maintaining efficient transmission of safe packets
Solution Approach 2:
The system implements feedback through the pre-transmit logic that continuously monitors line pattern criteria and adjusts transmission timing accordingly. The feedback mechanism ensures that only packets meeting the criteria are transmitted, creating a self-regulating system that maintains both efficiency and security
2Reliability
If packet transmission is delayed to improve line pattern quality, then transmission reliability is improved, but transmission speed decreases
Solution Approach 1:
The system applies partial delay only when necessary, rather than consistently delaying all packets. The pre-transmit logic evaluates each packet individually and delays only those that would violate line pattern criteria, allowing efficient transmission of compliant packets while ensuring reliability only when needed
Data Source
AI summary
A network component comprising pre-transmit logic coupled to a transmitter that transmits packets, wherein the pre-transmit logic is configured to determine whether a scrambling sequence for a packet complies with at least a threshold line pattern criteria, and if not, delay transmission of the packet to at least partially offset the scrambling sequence used for the packet, wherein the pre-transmit logic comprises a sequence evaluator that determines whether a scrambled packet complies with at least the threshold line pattern criteria.