PON Termination Interference Diagnosis Using Power and Timing Tests
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Solution Overview
Problem
Passive optical networks (PON) experience malfunctions in termination devices that affect network operation and user experience quality, necessitating a method to detect and assess the impact of these malfunctions.
Innovation Solution
A method involving transmission of test and nominal optical signals at varying powers, with quality indicator measurements to diagnose interference between termination devices, using a transmission schedule to arbitrate speech times and identify sources of interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If termination devices transmit optical signals at high power to improve signal quality, then reception quality improves, but interference with other termination devices increases
Solution Approach 1:
The patent performs preliminary measurements of reception quality indicators (such as bit error rate or signal-to-noise ratio) before actual communication occurs. By measuring the impact of test signals at different power levels in advance, the system pre-determines optimal transmission parameters that avoid interference, eliminating the need for trial-and-error during actual operation.
Solution Approach 2:
The patent implements a feedback mechanism where reception quality indicators are measured and used to adjust transmission parameters. The measured quality indicators from test signals feed back to the control system, which then optimizes transmission power and timing parameters to achieve reliable communication while minimizing interference with other termination devices.
2Length of moving object
If transmission power is increased to maintain signal quality over long distances, then communication range improves, but interference with neighboring branches increases
Solution Approach 1:
The patent dynamically adjusts transmission parameters based on measured reception quality indicators. Instead of using fixed high power transmission, the system adapts power levels and timing schedules in real-time based on actual interference conditions and signal quality measurements, allowing optimal communication range while minimizing interference.
Solution Approach 2:
The patent changes transmission parameters (power level, timing schedule) based on measured reception quality indicators. By varying these parameters dynamically and selecting optimal values from multiple test scenarios, the system achieves long communication range without causing excessive interference to neighboring branches.
3Productivity
If multiple termination devices transmit simultaneously to improve network throughput, then productivity improves, but interference between devices increases
Solution Approach 1:
The patent segments the transmission timeline into distinct time slots and schedules for different termination devices. By dividing the communication period into separate intervals where each device transmits sequentially rather than simultaneously, the system maintains high network throughput while eliminating interference between concurrent transmissions.
Solution Approach 2:
The patent implements periodic transmission schedules where termination devices transmit in alternating time slots. This periodic action pattern allows multiple devices to share the network efficiently while avoiding simultaneous transmissions that would cause interference, thus maintaining productivity through structured time-division multiplexing.
Data Source
AI summary
In using a passive optical network having an optical line terminal connected to a plurality of optical network units through a tree architecture, it can occur that some of the optical network units, or the optical line terminal, malfunction, sometimes to the extent that they have to be replaced. These malfunctions negatively affect the operation of the network and consequently user experience quality. A method is provided for diagnosing interference which makes it possible to evaluate the impact of a change in the transmission power for an optical signal for one termination device belonging to a passive optical network on the other termination devices of the passive optical network, in particular for the purpose of evaluating possibilities for parametrically optimizing the termination devices.