DSL Vectoring Group Connection Deterioration Detection

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Solution Overview

Problem

The existing vectoring systems in digital subscriber line environments are vulnerable to noise and connectivity issues due to sudden changes in crosstalk caused by line interruptions, leading to potential loss of Showtime state for multiple lines within a vectoring group, affecting overall DSL connectivity and user acceptance.

Innovation Solution

A method and device for determining connection deterioration during initialization, specifically identifying single wire interruptions by measuring attenuation and capacitance, and disabling the affected connection to prevent disturbance to other lines within the vectoring group, thereby ensuring stable operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If vectoring is used to compensate far-end self-crosstalk, then data transmission at high data rates is enabled, but the system becomes more vulnerable to noise that cannot be compensated

Engineering Contradiction:

Improvedata transmission rateVSAvoidvulnerability to noise

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The system performs preliminary detection during initialization to identify lines with single wire interruptions before they can disrupt the vectoring group. By detecting attenuation and capacitance anomalies early, the system can isolate problematic lines before they cause noise vulnerabilities that would affect other lines in the vectoring group.

Inventive Principle:

Principle #10Preliminary action

2Adaptability or versatility

If a line with single wire interruption is allowed to re-initialize, then the line may re-enter Showtime state, but crosstalk changes cannot be compensated and other lines of the vectoring group lose connectivity

Engineering Contradiction:

Improveline re-initialization capabilityVSAvoidconnectivity stability of vectoring group

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The system extracts or isolates the problematic line with single wire interruption from the vectoring group by disabling its connection. This prevents the line's abnormal crosstalk characteristics from affecting other lines in the vectoring group, allowing the remaining lines to maintain stable connectivity while the problematic line is handled separately.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The system uses feedback from attenuation and capacitance measurements during initialization to determine whether a line should be allowed to re-initialize. If abnormal values indicating single wire interruption are detected, the system provides feedback to disable the connection, preventing the line from re-entering Showtime state and disrupting other vectoring group members.

Inventive Principle:

Principle #23Feedback

3Reliability

If connection deterioration is not detected during initialization, then the system cannot identify single wire interruptions, but implementing detection increases system complexity

Engineering Contradiction:

Improvedetection capabilityVSAvoidinitialization process complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The system performs partial detection by measuring only attenuation and capacitance during initialization, rather than conducting a full diagnostic analysis. This limited measurement approach provides sufficient information to identify single wire interruptions without implementing overly complex detection algorithms, balancing reliability improvement with acceptable system complexity.

Inventive Principle:

Principle #16Partial or excessive action

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The solution effectively detects and mitigates the impact of single wire interruptions, maintaining stable connectivity within vectoring groups by shutting down or locking the affected connection, thus preventing signal degradation and ensuring continuous service for other lines.

Implementation Method 1

specifically identifying single wire interruptions by measuring attenuation and capacitance

Methodology Applied

Scientific EffectAttenuation:

Implementation Method 2

specifically identifying single wire interruptions by measuring attenuation and capacitance

Methodology Applied

Scientific EffectCapacitance: Capacitance

Implementation Method 3

data transmitted via the line 105 disturbs (as far-end crosstalk, FEXT 108) the data transmitted via the line 104 and is thus weighted with a channel-dependent coefficient 106 and subtracted from the signal to be sent across the line 104

Methodology Applied

Scientific EffectCrosstalk compensation:

Implementation Method 4

disabling the affected connection to prevent disturbance to other lines within the vectoring group, thereby ensuring stable operation

Methodology Applied

Scientific EffectConnection disabling:

Data Source

PatentEP2846526B1Data processing in a digital subscriber line environment

Publication Date: 2021.01.20 ADTRAN GMBH

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AI summary

A method for data processing in a digital subscriber line DSL environment is provided, said method comprising the steps of (i) determining a deterioration of a connection between a centralized unit and a decentralized unit during an initialization of the connection; and (ii) disabling the connection based on the deterioration. The deterioration generates crosstalk between the connections of a vectoring group.