Cross-Connect Node Bypasses Add-Drop Nodes in DSL Rings
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Solution Overview
Problem
DSL ring networks face issues with bandwidth reduction due to distance, inefficient protection switching, and deployment challenges, particularly when users disconnect their modems, leading to service disruptions and islands without service.
Innovation Solution
A cross-connect node system that selectively includes or bypasses add-drop nodes (ADNs) in a ring or linear network, using a status detector to manage ADN interfaces and a traffic switch to maintain network integrity and efficiency, allowing for remote configuration and POTS support during power failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If DSL ring networks are used to extend transmission distance, then bandwidth availability increases, but network complexity and deployment difficulty increase
Solution Approach 1:
The network is segmented into multiple ADNs (Add-Drop Nodes) that can be independently connected or disconnected. Each ADN interfaces with the ring network and can be selectively included or bypassed, allowing the network to be divided into manageable segments that can be deployed and maintained independently.
Solution Approach 2:
The cross-connect node provides dynamic reconfiguration capability, allowing ADNs to be selectively included or bypassed based on service requirements. This dynamic switching enables the network to adapt its topology without physical reconfiguration, simplifying deployment while maintaining extended transmission distance capabilities.
2Reliability
If protection switching is implemented to prevent service disruptions, then network reliability improves, but switching efficiency decreases
Solution Approach 1:
The cross-connect node is pre-configured with the capability to rapidly switch between ADNs. Protection switching paths are established in advance, allowing the system to quickly activate backup paths when service disruptions occur, minimizing switching time while maintaining high reliability.
3Stability of the object's composition
If ADNs are bypassed to manage network disruptions, then network stability improves, but service availability to individual nodes decreases
Solution Approach 1:
The cross-connect node enables dynamic selection of which ADNs to include or bypass. This allows the network to maintain stability by bypassing problematic nodes while preserving service availability to healthy nodes. The selective bypassing capability ensures that network stability improvements do not come at the cost of unnecessary service disruptions.
4Ease of manufacture
If remote configuration is enabled for easier deployment, then ease of installation improves, but network security risks increase
Solution Approach 1:
The cross-connect node acts as an intermediary that manages remote configuration operations. It provides controlled access to network elements, allowing remote deployment while maintaining security through authenticated access and controlled configuration changes. This intermediary layer enables easy deployment without directly exposing the network to security risks.
Data Source
AI summary
Systems and methods for connecting and disconnecting to a DSL ring are provided. A cross connect node is used to connect multiple endpoints into a DSL ring. When a given endpoint is powered down, a cross connect bypasses that endpoint such that the ring is maintained. POTS service is provided irrespective of whether the endpoint is bypassed for the purpose of the ring. The status of a bypassed node can be ascertained using baseband signalling.