Full Duplex Expander for Coaxial Signal Isolation and Amplification
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Solution Overview
Problem
Converting to a full duplex (FDX) network architecture by replacing legacy analog amplifiers with FDX nodes increases cost and deployment time due to the need to replace coaxial cables with fiber connections, as FDX transmission is not compatible with legacy analog amplifiers.
Innovation Solution
Implementing a full duplex expander that separates and amplifies upstream and downstream signals in the same frequency band using separate paths, allowing for analog amplification without replacing legacy 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 traffic transmission is achieved, but the cost and deployment time increase significantly due to the need to replace coaxial cables with fiber connections
Solution Approach 1:
The patent segments the full duplex signal into upstream and downstream components that can be processed separately. The expander device divides the received full duplex signal into separate upstream and downstream paths, allowing each to be amplified independently while maintaining compatibility with existing coaxial cable infrastructure.
Solution Approach 2:
The expander device acts as an intermediary component that bridges the gap between legacy analog amplifier infrastructure and full duplex transmission requirements. It receives full duplex signals, separates them into upstream and downstream components, amplifies them separately, and recombines them, enabling full duplex operation without requiring fiber cable replacement.
2Adaptability or versatility
If legacy analog amplifiers are replaced with FDX nodes to enable full duplex transmission, then full duplex traffic transmission is achieved, but the deployment time increases due to the need to replace coaxial cables with fiber connections
Solution Approach 1:
The expander device dynamically switches between different signal paths based on whether upstream or downstream signals are present. It uses switching mechanisms to route signals through appropriate amplification paths, enabling adaptive full duplex operation over existing coaxial infrastructure without requiring time-consuming cable replacements.
3Reliability
If separate amplification paths are used for upstream and downstream signals in full duplex mode, then signal isolation is improved, but the device complexity increases
Solution Approach 1:
The patent merges the functionality of separate upstream and downstream amplifiers into a single expander device. By combining the amplification paths and using a shared housing with integrated switching mechanisms, the device achieves the signal isolation benefits of separate paths while reducing the number of discrete components and simplifying installation.
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
Enables full duplex traffic transmission without the need for costly and time-consuming fiber replacements, ensuring efficient amplification and isolation of upstream and downstream signals in existing network infrastructure.
Implementation Method 1
The FDX expander then separates the downstream signal and the upstream signal into separate paths
Implementation Method 2
The downstream signal is amplified using a first path and the upstream signal is amplified using a second path
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.