XDSL Pseudo Link Manager for Crosstalk Disruption
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Solution Overview
Problem
Existing X-DSL modem systems face challenges in managing varying crosstalk levels in bundled digital subscriber lines, which can degrade performance and render connections inoperable due to pseudo links established between unconnected transceiver pairs, leading to attenuated data rates and session failures.
Innovation Solution
A pseudo link manager is introduced, comprising a line monitor and disruptor, which detects pre-existing sessions on subscriber lines and transmits disruptor signals to disrupt pseudo links, allowing new sessions to be established between physically coupled transceivers, thereby managing crosstalk and ensuring proper communication channel establishment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If X-DSL modems operate on bundled subscriber lines to increase bandwidth, then data transmission speed is improved, but crosstalk between lines degrades performance and may render connections inoperable
Solution Approach 1:
The system performs preliminary actions by monitoring the subscriber line before session establishment and disrupting pseudo-links in advance. The line monitor detects pre-existing sessions and the disruptor transmits disruptor signals to eliminate pseudo-links before the intended session begins, preventing crosstalk-related failures before they occur.
Solution Approach 2:
The system implements feedback through the line monitor that continuously monitors the subscriber line for pre-existing sessions. When a pseudo-link is detected, the feedback mechanism triggers the disruptor to send disruptor signals, creating a closed-loop system that responds to crosstalk conditions and adjusts session establishment accordingly.
2Adaptability or versatility
If the modem components are made reconfigurable to match varying loop loss, then adaptability to different subscriber lines is improved, but device complexity increases
Solution Approach 1:
The pseudo link manager provides multi-functionality by combining monitoring, detection, and disruption capabilities in a single management unit. This universal component handles various session establishment scenarios across different subscriber lines without requiring separate complex mechanisms for each function, thereby managing complexity while maintaining adaptability.
3Ease of operation
If pseudo links are allowed to establish between unconnected transceivers, then automatic session establishment is simplified, but connection reliability deteriorates due to attenuated data rates
Solution Approach 1:
The pseudo link manager acts as an intermediary between the transceivers and the session establishment process. It monitors the line, detects pseudo-links, and disrupts them before sessions begin. This intermediary function maintains the simplicity of automatic session establishment while ensuring reliability by preventing pseudo-link formation that would cause attenuated data rates.
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
A transceiver having shared and discrete components forming a transmit path and a receive path configured to couple to a subscriber line for establishing a communication channel with a remote transceiver. The transceiver comprises a pseudo link manager coupled between the transmit and receive path components to manage pseudo links on the subscriber line prior to entry into a session with the remote transceiver. The pseudo link manager includes: a line monitor and a disruptor. The line monitor monitors the subscriber line, prior to initiating a session, for a received communication signal indicative of a pre-existing session on the remote transceiver. The disruptor transmits a disruptor signal over the subscriber line to the remote transceiver responsive to the detection by the monitor of the received communication signal; thereby disrupting the remote transmitter's pre-existing session and allowing a new session to be established with the remote transceiver.