DSL Technology Selection Based on Real-Time Attenuation
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Solution Overview
Problem
Conventional DSL technology selection methods are inefficient as they rely on historical data, leading to suboptimal performance and increased complexity, and can result in interoperability issues and slow initialization times in multi-vendor environments, especially when adapting to changing line conditions.
Innovation Solution
An automated method and controller for selecting DSL technologies based on real-time attenuation and other parameters like power spectral density and noise environment to optimize data transfer between DSL transceivers, allowing for dynamic switching between supported technologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed product selection based on historical line performance data is used, then equipment configuration is simplified, but selection accuracy deteriorates and cannot adapt to changing line conditions
Solution Approach 1:
The patent implements dynamic DSL technology selection where the system continuously monitors current line conditions (attenuation, noise, spectral density) and automatically selects the most appropriate DSL technology in real-time, rather than using fixed historical configurations. This allows the system to adapt to changing line conditions while maintaining operational simplicity through automated decision-making algorithms.
Solution Approach 2:
The system employs feedback mechanisms by continuously measuring current line performance parameters and using this information to make informed decisions about DSL technology selection. The feedback loop ensures that the selected technology optimizes data transfer performance based on actual current conditions rather than relying on outdated historical data.
2Adaptability or versatility
If DSLAM tries to train in multiple DSL technologies before deciding, then technology selection flexibility improves, but initialization time increases significantly
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing optimal DSL technology selections based on measured line conditions before actual data transfer begins. The system performs quick assessments of line parameters (attenuation, noise floor, spectral density) and pre-determines the best DSL technology to use, avoiding the need for lengthy training sequences in multiple technologies during initialization.
Solution Approach 2:
The system changes operational parameters by switching between different DSL technology configurations based on measured line conditions. Rather than training in multiple technologies sequentially, the system uses parameter-based decision-making (comparing measured parameters against thresholds) to quickly select the optimal technology configuration, significantly reducing initialization time while maintaining flexibility.
3Productivity
If VDSL2 technology is used on short lines, then data rate performance improves, but performance deteriorates on lines longer than 1 kilometer
Solution Approach 1:
The patent implements parameter-based technology selection where the system measures line attenuation and other parameters to determine the appropriate DSL technology. For short lines with low attenuation, VDSL2 is selected to maximize data rate. For longer lines with higher attenuation, the system automatically selects alternative technologies (such as ADSL2+) that maintain reliable performance, ensuring optimal productivity across all line lengths.
4Length of stationary object
If ADSL2+ technology is used on long lines, then reach and data rate improve, but performance deteriorates on short lines compared to VDSL2
Solution Approach 1:
The patent employs dynamic technology selection that adapts to line length characteristics. The system measures current line conditions and dynamically selects ADSL2+ for long lines to maximize reach and maintains high data rates, while automatically switching to VDSL2 for short lines where it can deliver superior performance. This dynamic adaptation ensures optimal productivity regardless of line length.
Data Source
AI summary
A method for selection of a digital subscriber line (DSL) technology for use by a first DSL transceiver in transferring data over a communications line between the first DSL transceiver and a second DSL transceiver. For the selection, an indication of attenuation in the communications line between the DSL transceivers is obtained and a DSL technology for use by the first DSL transceiver is selected from a plurality of DSL technologies supported by the first DSL transceiver. Selection of the DSL technology is determined on the basis of the indication of attenuation. Optionally, selection of the DSL technology may, in addition, be based on other parameters comprising an indication of the power spectral density mask limiting the power output onto the line by the DSL transceiver; an indication of the noise environment of the communications line; an indication of the highest discrete multitone modulation tone transmitted by the first DSL transceiver over the communications line.