Network Device Control Chip Dynamic Speed Adjustment for Fiber Breaks
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Solution Overview
Problem
Existing network devices fail to prevent one-sided link-up states when a fiber medium is broken, leading to packet loss and issues in the OSI model due to limitations in IEEE 802.3 specifications, where a failed link partner cannot inform the local device of faults.
Innovation Solution
A network device control chip with an analog front-end circuit, control circuit, and media selection unit that adjusts transmission speeds based on signal amplitude or energy, switching to a lower speed when the signal is below a threshold to prevent one-sided link-ups, and uses a Far-End Fault indication to notify the link partner of faults.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the network device operates at a fixed high speed, then the transmission efficiency is improved, but the reliability deteriorates when the fiber medium is broken causing one-sided link-up
Solution Approach 1:
The patent implements dynamic speed adjustment by monitoring signal amplitude or energy levels. When the detected signal quality falls below a threshold, the system automatically switches from a first speed to a second speed, transforming the fixed-speed operation into a dynamic adaptive system that responds to real-time fiber medium conditions
Solution Approach 2:
The patent changes the operational parameter (transmission speed) based on detected signal conditions. By monitoring signal amplitude or energy and comparing against thresholds, the system adjusts the speed parameter to prevent one-sided link-up states, thereby resolving the contradiction between maintaining high productivity and ensuring reliability
2Reliability
If the network device monitors signal amplitude continuously, then the reliability is improved by detecting fiber breaks, but the device complexity increases
Solution Approach 1:
The control circuit performs self-diagnosis by monitoring its own received signal characteristics. The system uses built-in signal detection capabilities to automatically identify fiber medium failures without requiring external monitoring equipment, thereby improving reliability while minimizing additional device complexity
Solution Approach 2:
The patent implements a feedback mechanism where the control circuit continuously monitors signal amplitude or energy and uses this information to trigger speed adjustments. This closed-loop feedback system enables reliable fiber break detection through simple threshold comparisons rather than complex analysis algorithms
Data Source
AI summary
An operation method of a network device and a control chip of the network device are provided. The network device receives an input signal through a fiber medium. The operation method includes the following steps: setting a target speed of the network device to a first speed; transmitting and/or receiving a data at the first speed; and setting the target speed of the network device to a second speed which is different from the first speed when the amplitude or energy of the input signal is not greater than a threshold.