FDX Expander Amplification in Shared-Band Full Duplex Cable Networks
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Solution Overview
Problem
The transition to full duplex communications in cable networks is hindered by the need to replace legacy analog amplifiers with FDX nodes, which increases costs and deployment time due to the requirement for fiber connections, as analog amplifiers are not compatible with full duplex transmission in the same frequency band.
Innovation Solution
The introduction of FDX expanders that can amplify full duplex signals by separating and isolating downstream and upstream signals in the same frequency band, allowing for amplification without replacing analog amplifiers with FDX nodes, and enabling the use of coaxial cables instead of fiber 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 capability is achieved, but deployment cost and time increase due to fiber connection requirements
Solution Approach 1:
A hybrid amplifier/FDX node device is introduced as an intermediary solution. This device combines the signal amplification functionality of legacy analog amplifiers with the full duplex capability of FDX nodes, allowing it to operate in both modes. The device includes a signal processing unit that can function as either an analog amplifier or an FDX node depending on configuration, eliminating the need for complete network replacement while enabling full duplex transmission.
Solution Approach 2:
The hybrid device is designed with multi-functionality to perform both analog amplification and full duplex node operations. It includes configurable signal processing paths that can handle either analog full-duplex signals or digital packet-based signals, allowing a single device type to replace both legacy amplifiers and FDX nodes, thereby simplifying deployment and reducing costs.
2Adaptability or versatility
If FDX nodes are deployed to replace analog amplifiers, then full duplex transmission is enabled, but infrastructure cost increases due to coaxial cable replacement with fiber
Solution Approach 1:
The solution implements partial digitalization rather than complete conversion to FDX nodes. The hybrid device maintains analog signal paths for segments where coaxial cable infrastructure exists, performing only the necessary digital signal processing functions to enable full duplex operation. This partial action approach allows full duplex capability without the excessive cost of replacing all coaxial cables with fiber.
Solution Approach 2:
The hybrid device changes operational parameters dynamically, switching between analog amplification mode and full duplex node mode based on network requirements. By adjusting signal processing parameters and operating modes rather than changing physical infrastructure, the system enables full duplex transmission while maintaining existing coaxial cable connections, thereby avoiding material replacement costs.
3Reliability
If complete replacement with FDX nodes is performed, then full duplex performance is optimized, but deployment timeline extends due to infrastructure upgrades
Solution Approach 1:
The hybrid device is pre-configured with both analog amplification and full duplex node capabilities during manufacturing. This preliminary preparation allows for rapid deployment since the device can be installed and activated immediately without requiring post-installation infrastructure upgrades or complex configuration. The full duplex functionality is already integrated and tested, enabling quick transition while maintaining performance.
Solution Approach 2:
The hybrid device replicates the functionality of both legacy analog amplifiers and FDX nodes within a single unit. By copying and integrating the essential functions of both device types, it provides full duplex performance equivalent to FDX nodes while maintaining compatibility with existing analog infrastructure, thereby avoiding time-consuming replacement projects.
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.