Bonded DSL Loop Segment with Vectoring for Crosstalk Reduction
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Solution Overview
Problem
Current DSL systems face limitations in data rates due to line attenuation, crosstalk, and interference, especially in short loops, which restrict bandwidth and availability, making it challenging to achieve higher data transmission without extending optical fiber to customer premises.
Innovation Solution
The implementation of a high-speed DSL system that bonds multiple short loops to create a multiple loop segment, utilizing signal vectoring and expanded frequency spectra, along with impedance matching circuits, to enhance data carrying capacity and reduce interference, thereby increasing data rates beyond individual loop capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If signal vectoring and multiple loop bonding are implemented, then data rate is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple DSL loops into a bonded segment, merging their capabilities to achieve higher aggregate data rates. The vectoring unit coordinates signals across all bonded loops, treating them as a unified system rather than separate channels, which multiplies the data carrying capacity while managing complexity through centralized control.
Solution Approach 2:
The vectoring unit serves multiple functions: it performs signal coordination across bonded loops, implements frequency spectrum management, handles impedance matching, and provides interference cancellation. This multi-functional approach consolidates what would otherwise require separate systems into a single integrated unit, improving data rates without proportionally increasing overall device complexity.
2Productivity
If expanded frequency spectrum is used, then data carrying capability is improved, but susceptibility to interference increases
Solution Approach 1:
The patent converts the harmful effect of crosstalk and interference into a beneficial tool by using vectoring to deliberately coordinate signals across bonded loops. The system models and predicts interference patterns, then uses this knowledge to pre-cancel or neutralize harmful effects while maximizing the use of expanded frequency spectra. This transforms what would be uncontrollable noise into a managed parameter that can be optimized.
Solution Approach 2:
The system dynamically adjusts frequency spectrum allocation and signal parameters across the bonded loops based on real-time channel conditions. By changing operational parameters such as frequency assignment, power levels, and modulation schemes, the system maximizes data carrying capability in expanded spectra while adapting to minimize interference susceptibility in different environmental conditions.
3Productivity
If multiple loops are bonded to increase bandwidth, then data rate is improved, but crosstalk and interference increase
Solution Approach 1:
The vectoring unit deliberately coordinates signals across all bonded loops, using knowledge of crosstalk coupling to pre-cancel interference. Rather than treating crosstalk as an unwanted side effect to be minimized, the system models the coupling between loops and uses this information to adjust signal levels and phases, converting the potentially harmful crosstalk into a predictable and manageable parameter that can be optimized for higher data rates.
4Productivity
If impedance matching circuits are added, then transmission efficiency is improved, but device complexity increases
Solution Approach 1:
The impedance matching function is merged into the vectoring unit rather than being implemented as separate circuits for each loop. This integration consolidates the complexity into a single coordinated system that handles impedance matching across all bonded loops simultaneously, improving transmission efficiency while avoiding the multiplication of separate matching circuits that would proportionally increase device complexity.
Data Source
AI summary
A DSL system includes a multiple loop segment where K loops are bonded to provide a multiple loop segment having up to (2K−1) communication channels on which transmissions are vectored. The segment may be a drop to a customer premises, an inter-pedestal link, or any other suitable part of a larger DSL system. Generally the bonded loops are relatively short, being 300 meters or less. Signal vectoring is used to increase the speed and data carrying capability of the channels. In some embodiments, an expanded frequency spectrum also can be used to increase the data carrying capability of one or more of the channels. An impedance matching circuit may be coupled to each end of the segment to provided efficient transmission of data across the segment. A controller may provide control signals used to operate the segment as a vectored system and, if desired, frequency bandwidth control signals. The controller may monitor and/or collect data and information from the DSL system to assist in generating control signals. The controller can be a dynamic spectrum manager or DSM Center that includes a computer system and/or other hardware to assist in performing the required functions.