CATV Network Diplex Filter Switching
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Solution Overview
Problem
The existing cable television (CATV) networks face challenges in adjusting the frequency range and bandwidth of communication channels, particularly with the introduction of DOCSIS 3.1, which requires manual replacement of diplex filters at each network element, leading to slow and cumbersome processes and frequent service breakdowns for customers.
Innovation Solution
A network element with at least two diplex filters and a control circuit that measures radio frequency signal energy to automatically select and connect the appropriate diplex filter, allowing for remote control and minimizing service disruptions by determining when to switch between filters based on energy thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If manual replacement of diplex filters is used, then frequency band adjustment can be achieved, but the process becomes slow and causes frequent service breakdowns
Solution Approach 1:
The patent implements dynamic switching between first and second diplex filters based on detected signal conditions. The network element can automatically transition from a first upstream frequency band to a second upstream frequency band by activating the appropriate diplex filter, enabling adaptive frequency band adjustment without manual intervention and eliminating service disruptions.
Solution Approach 2:
The patent changes the operational parameters of the network element by switching between different diplex filters with different frequency characteristics. The control circuit detects signal energy levels and automatically adjusts which diplex filter is active, thereby changing the upstream frequency band parameters dynamically based on network conditions and DOCSIS version requirements.
2Adaptability or versatility
If manual replacement of diplex filters is used, then frequency band adjustment can be achieved, but operational costs increase due to frequent interventions
Solution Approach 1:
The network element performs self-service by automatically detecting the presence of downstream signals and selecting the appropriate diplex filter configuration. The control circuit monitors signal energy levels and autonomously switches between first and second diplex filters based on detected conditions, eliminating the need for manual operational intervention and reducing operational complexity.
Solution Approach 2:
The control circuit implements feedback by continuously monitoring the energy of downstream radio frequency signals and using this information to determine which diplex filter should be active. This closed-loop control enables automatic adaptation to network conditions, eliminating manual adjustments and reducing operational complexity while maintaining optimal frequency band configuration.
3Productivity
If remote control of diplex filter selection is implemented, then service disruptions are minimized, but compatibility with networks without remote signalling is lost
Solution Approach 1:
The network element performs self-service by automatically detecting the presence of downstream signals and selecting the appropriate diplex filter configuration. This autonomous operation ensures service continuity without requiring remote signalling infrastructure, thereby maintaining compatibility with legacy networks while eliminating service disruptions associated with manual filter replacement.
Solution Approach 2:
The control circuit acts as an intermediary between the diplex filters and the network signal, automatically selecting which filter should be active based on detected signal conditions. This intermediary function enables seamless transitions between frequency bands without requiring external control signals, ensuring both service continuity and broad network compatibility.
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
This solution automates the process of adjusting upstream bandwidth, reducing service breakdowns and operational costs by enabling remote selection of diplex filters, thus facilitating smoother upgrades to higher data rates without manual intervention.
Implementation Method 1
a control circuit for measuring energy of radio frequency signals below said second downstream frequency band
Data Source
AI summary
A network element of a cable television (CATV) network, comprising an input for signal transmission; at least two diplex filters configured to be connected to said input, a first diplex filter comprising bandpass filters for a first upstream and downstream frequency bands and a second diplex filter comprising bandpass filters for a second upstream and downstream frequency bands, wherein an upper frequency edge of the second upstream frequency band is higher than an upper frequency edge of the first upstream frequency band and higher than or equal to a lower frequency edge of the first downstream frequency band and a lower frequency edge of the second downstream frequency band is higher than the upper frequency edge of the second upstream frequency band; a control circuit for measuring energy of radio frequency signals below said second downstream frequency band; and a switch for connecting one of said at least two diplex filters to said input, wherein said control circuit is configured to control the switch to connect the first diplex filter to said input in response to the energy of radio frequency signals below said second downstream frequency band exceeding a threshold value; or connect the second diplex filter to said input in response to the energy of radio frequency signals below said second downstream frequency band at most reaching the threshold value.