CATV Node Optical Conversion for Reduced Headend Space
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Solution Overview
Problem
Current Distributed Access Architecture systems for cable television (CATV) do not fully meet consumer demands for expanded data rates, better signal quality, and improved system reliability, as well as operational efficiencies in deployment and reduced network and headend power and space requirements.
Innovation Solution
The system modifies conventional CATV architectures by incorporating a CATV node that receives signals from a headend, converts them to optical signals for distribution via two-way fiber optic cable, and uses micro distribution systems with low pass filters to manage RF signals and powering signals, allowing for efficient signal flow and power distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If signal processing is moved from CATV headend to CATV node in Distributed Access Architecture, then operational efficiency and space requirements at headend are improved, but system complexity and deployment difficulty increase
Solution Approach 1:
The patent segments the CATV system into modular components: headend, optical network terminals (ONTs), and cable modem termination systems (CMTS). This segmentation allows signal processing functions to be distributed to nodes while maintaining manageable system complexity through standardized interfaces and independent module deployment.
2Use of energy by stationary object
If more signal processing functions are distributed to CATV nodes, then headend power and space requirements are reduced, but deployment complexity and operational difficulty increase
Solution Approach 1:
The patent implements universal ONTs and CMTS modules that can perform multiple signal processing functions (optical-to-RF conversion, modulation, demodulation, filtering). This multi-functionality reduces headend power and space requirements while maintaining deployment simplicity through standardized, plug-and-play modular units with consistent interfaces.
3Productivity
If conventional CATV architecture is modified to meet expanded data rate demands, then system capacity is improved, but customer and operator disruption increases
Solution Approach 1:
The patent deploys optical infrastructure and modular signal processing units in advance, preparing the network for high-speed data transmission before customer demand peaks. This preliminary deployment of ONTs and optical cables enables seamless upgrades to expanded data rates without requiring service interruptions or customer presence during installation.
4Adaptability or versatility
If micro distribution systems with multiple tap strings are implemented, then signal distribution flexibility is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent divides the distribution network into independent tap strings, each serving specific customer groups. Each string is a standardized, pre-manufactured module with consistent components (taps, filters, amplifiers), enabling mass production and simplified assembly while providing flexible configuration options for different deployment scenarios through modular concatenation.
Data Source
AI summary
In one embodiment, a system includes a CATV node, a first device, and at least one micro distribution system. The CATV node transmits CATV RF signals to the first device, which converts the RF signals to optical signals. Each micro distribution system includes a micro node receiving the optical signals from the first device and converting the optical signals to RF signals. Each micro distribution system further includes at least two strings of taps independently coupled to the micro node and receiving the RF signals from the micro node. For each string of taps, the received RF signals are passed from the micro node along the taps, while a powering signal is passed along the taps.