Crosstalk manager for access network nodes

A technology for accessing nodes and interfaces, applied in the direction of network connection, reducing crosstalk, modulating carrier system, etc., can solve problems that are not designed to obtain loop crosstalk coupling strength, etc.

Inactive Publication Date: 2006-03-01
ALCATEL LUCENT SAS
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  • Abstract
  • Description
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Problems solved by technology

So in practice, using a loop database to determine which lines are interacted by crosstalk can be very difficult
Another rather practical problem...

Method used

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  • Crosstalk manager for access network nodes
  • Crosstalk manager for access network nodes

Examples

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Embodiment Construction

[0025] figure 1 An ADSL access network is shown, where hundreds or thousands of ADSL modems are connected to an access multiplexer DSLAM or an ADSL central office. To demonstrate the working of one embodiment of the invention, figure 1 Four such modems are shown in : Modem 1 , Modem 2 , Modem 3 and Modem 4 , which are coupled to the DSLAM via twisted pair copper wires - Line 1 , Line 2 , Line 3 and Line 4 respectively. The first two lines, Line 1 and Line 2, form part of the same physical bundle: bundle 1. Likewise, two other lines, Line 3 and Line 4, form part of a second physical bundle: Bundle 2.

[0026] figure 1 The access multiplexer DSLAM in is incorporated with a crosstalk agent according to the invention. Whenever the on / off state of one line connected to the DSLAM changes, the crosstalk agent collects the noise margin values ​​measured on all other lines from the DSLAMMIB (Management Information Database). The difference between the noise margin measured on a pa...

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Abstract

A crosstalk agent for integration in or connection to an access node (DSLAM) automatically gathers quantitative information indicative for the crosstalk coupling between lines (LINE1, LINE2, LINE3, LINE4) connected to the access node (DSLAM). The information may be extracted from an access node MIB each time the on/off state of a line changes, and optionally is used to group the lines in virtual binders. The crosstalk agent may optionally interface with service deployment or service upgrade experts, or with a dynamic spectrum management module in the access node (DSLAM).

Description

technical field [0001] The invention relates to the estimation of crosstalk between communication lines connected to access nodes, such as for example between Digital Subscriber Lines (DSLlines) connected to a Digital Subscriber Line Access Multiplexer (DSLAM). Background technique [0002] Crosstalk remains one of the main limiting factors for DSL transmission. Crosstalk limits the achievable DSL bit rate (for a given loop length) or DSL to a guaranteed minimum bit rate. Further, crosstalk can cause errors in transmission or worse, it can cause service interruption and require time-consuming re-initialization and re-synchronization. Therefore, crosstalk plays a major role in DSL service deployment. For example, a line may not be available due to excessive crosstalk; upgrading users to higher bit rate services may not be possible for some users due to crosstalk; crosstalk may have to be passed through dynamic spectrum management when a particular line is in use (DSM) algo...

Claims

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Application Information

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IPC IPC(8): H04B3/32H04M11/06
CPCH04B3/46H04L41/046H04L12/66H04L41/0213H04L27/2601
Inventor T·波士托恩P·卢伊藤K·P·F·万阿克
Owner ALCATEL LUCENT SAS
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