FDX Expander Signal Isolation for Coaxial Full-Duplex Networks
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Solution Overview
Problem
The high cost and time required to roll out full duplex communication networks due to the need to replace legacy analog amplifiers with FDX nodes, which necessitate fiber connections and disrupt existing coaxial cable infrastructure, hinder efficient full-duplex traffic delivery.
Innovation Solution
The implementation of FDX expanders that can amplify full-duplex signals by separating and isolating upstream and downstream signals in the same frequency band, allowing for amplification without replacing analog amplifiers with FDX nodes, and maintaining coaxial cable connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If legacy analog amplifiers are replaced with FDX nodes to enable full duplex transmission, then full duplex functionality is achieved, but deployment cost and time increase significantly
Solution Approach 1:
The patent introduces FDX expanders as intermediary devices that interface between legacy amplifiers and FDX nodes. These expanders receive full-duplex signals from FDX nodes, separate upstream and downstream traffic, and amplify them appropriately before delivering to subscriber premises. This intermediary approach allows legacy amplifier infrastructure to be retained while enabling full-duplex functionality through the expander devices.
2Adaptability or versatility
If FDX nodes are deployed to replace amplifiers, then full duplex traffic delivery is enabled, but infrastructure replacement cost increases due to fiber cable requirements
Solution Approach 1:
The FDX expander is designed to perform multiple functions: it separates upstream and downstream signals, amplifies both directions independently, and interfaces with both FDX nodes and legacy coaxial infrastructure. This multi-functional device allows the network to support full-duplex traffic delivery while maintaining compatibility with existing coaxial cable infrastructure, eliminating the need for expensive fiber cable replacement in many scenarios.
3Adaptability or versatility
If amplifiers are replaced with FDX nodes, then full duplex transmission is compatible, but deployment timeline extends due to cable replacement requirements
Solution Approach 1:
The FDX expander is designed to be deployed at subscriber premises rather than requiring replacement of network infrastructure. This preliminary action at the customer end allows full-duplex functionality to be enabled without disrupting the existing network backbone, eliminating the time-consuming process of replacing coaxial cable with fiber throughout the network.
4Ease of manufacture
If legacy amplifiers are retained, then deployment cost is reduced, but full duplex transmission cannot be supported
Solution Approach 1:
The system segments full-duplex functionality into separate upstream and downstream paths that can be independently amplified. The FDX expander divides the full-duplex signal from the FDX node into upstream and downstream components, amplifies each separately using dedicated amplifiers, and delivers them to the appropriate ports. This segmentation allows legacy amplifier hardware to be utilized while supporting full-duplex transmission through proper signal separation and independent amplification.
Data Source
AI summary
In one embodiment, a method receives a downstream signal and an upstream signal in a same frequency band. The downstream signal and the upstream signal are separated into a first path and a second path. The downstream signal using the first path and the upstream signal using the second path are amplified in an analog domain. The method isolates the downstream signal and the upstream signal from one another and sends the downstream signal downstream to a subscriber device and sends the upstream signal towards a full duplex node.