DSL Training Non-Disruptive Integration
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Solution Overview
Problem
Existing DSL systems face disruptions when new lines are activated, causing crosstalk that interferes with existing operations, particularly in vectored systems, leading to performance reductions and service disruptions.
Innovation Solution
The implementation of a 'polite training' method using PSDMASK and CARMASK capabilities to set initial low transmit power levels for new lines, allowing them to be introduced non-disruptively, with gradual power adjustments and tone-by-tone activation to minimize crosstalk effects, enabling the DSL system to adapt without disrupting existing lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If new DSL lines are activated with high transmit power levels, then the new lines can achieve desired data rates, but existing lines experience service disruption and performance reduction due to crosstalk
Solution Approach 1:
The system performs preliminary actions by detecting the presence of existing lines before activating new lines, and by initially activating new lines at reduced power levels. This allows the system to prepare mitigation strategies in advance and gradually introduce new lines without causing immediate disruption to existing services, thereby maintaining service continuity while eventually achieving desired data rates.
2Productivity
If new DSL lines are activated with high transmit power levels, then the new lines can achieve desired data rates, but existing lines experience interference and performance reduction
Solution Approach 1:
The system changes the power level parameter of new lines during the activation process. New lines are initially activated at reduced power levels to minimize crosstalk interference to existing lines. Once detection and mitigation are complete, the power levels are gradually increased to achieve desired data rates, thus resolving the contradiction between productivity and harmful interference.
3Reliability
If vectored system re-configuration is performed to avoid disrupting strong crosstalk, then existing lines maintain service quality, but system complexity increases
Solution Approach 1:
The system performs self-service by automatically detecting the presence of existing lines, determining their operational parameters, and configuring mitigation strategies without requiring manual intervention. The detection unit and controller work autonomously to re-configure the vectored system, reducing the perceived complexity for operators while maintaining service quality through automated processes.
4Reliability
If new lines are trained at low power levels to be non-disruptive, then existing services are maintained, but training accuracy and crosstalk channel estimation may be insufficient
Solution Approach 1:
The system employs periodic action by repeatedly adjusting the power levels of new lines during the training process. New lines are activated at low power levels for initial detection, then power levels are periodically increased in steps, with detection and mitigation performed at each stage. This periodic adjustment allows the system to accumulate sufficient measurement data for accurate crosstalk channel estimation while maintaining service continuity throughout the process.
Data Source
AI summary
Existing and future standardized VDSL2 and other systems can be integrated into and used with a vectored DSLAM or other vectored or non-vectored DSL system, without a new user disrupting service to other users in the same or a nearby binder, in some cases by using transmit power, CARMASK and/or PSDMASK DSL capabilities to reduce both downstream and upstream training-signal levels so that training of a new DSL line is non-disruptive, despite a lack of knowledge of the pre-existing binder. For vectored systems, the crosstalk from that tone can be observed, learned and then added to the vectoring system so that any subsequent excitation on that tone would be eliminated by vector processing. A second tone then can be added in the same way, etc. In non-vectored DSLs that might be operating in a binder or line set, once these non-vectored lines are observed to be present, a vectored line set controller, such as a DSL optimizer, then can anticipate the potential interference from such non-vectored lines.