Optical Network Unit Automatic Shutdown for Upstream Collision Prevention
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Solution Overview
Problem
In passive optical network systems, malfunctioning optical network units (ONUs) can continue to transmit during unauthorized time slices, compromising upstream data traffic and network integrity, as existing technologies lack effective detection and remediation methods for such faults.
Innovation Solution
An ONU with automatic shutdown capability, comprising a driver circuit, light source, authorization circuit, monitoring circuit, comparison circuit, and deactivation circuit, which forms frame state signals, monitors upstream optical power, compares it to a threshold, and generates a shutdown signal to deactivate the light source when unauthorized transmission occurs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an ONU continues to transmit during unauthorized time slices due to malfunction, then the ONU maintains its transmission function, but the upstream data traffic integrity is compromised
Solution Approach 1:
The patent implements a feedback mechanism where the ONU monitors its own transmission status and compares it with authorized time slices. When a discrepancy is detected (transmission occurring during unauthorized time slices), the system generates a shutdown signal to deactivate the light source, thereby eliminating the harmful unauthorized transmission while maintaining data integrity
Solution Approach 2:
The ONU performs self-diagnosis and self-correction by automatically detecting its own malfunction conditions and shutting down without external intervention. The monitoring circuit continuously checks transmission timing, and upon detecting unauthorized transmission, the deactivation circuit automatically deactivates the light source, enabling the system to service itself
2Reliability
If an automatic shutdown system is implemented to detect and correct ONU malfunctions, then data integrity is protected, but the device complexity increases
Solution Approach 1:
The patent combines multiple functions into integrated circuits to minimize complexity. The monitoring circuit, comparison logic, and deactivation control are merged into a unified shutdown system that works cooperatively with the existing driver circuit and light source, rather than adding completely separate systems
Solution Approach 2:
The patent introduces a monitoring circuit as an intermediary between the driver circuit and the light source. This intermediary continuously monitors transmission timing and mediates between the transmission function and the shutdown function, enabling fault detection and correction without directly modifying the core transmission components
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Prevents malfunctioning ONUs from compromising data integrity by automatically shutting down when unauthorized transmission is detected, ensuring stable upstream data traffic and network operation.
Implementation Method 1
a light source, such as a laser diode, connected to the driver circuit and configured to generate an upstream optical signal
Implementation Method 2
a monitoring circuit operable to monitor the upstream optical power level
Data Source
AI summary
An optical network unit useful in a passive optical network has capability for automatic shutdown upon detection of a malfunction, thereby protecting the integrity of upstream data transmitted in the network. The unit detects the generation of upstream light during intervals in which transmission is not authorized. In response, the light source of the unit is deactivated to prevent collisions with upstream data from other optical network units in the network.