Out-of-band Control for Legacy Set Top Boxes
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Solution Overview
Problem
Managing channel mapping and control functionality for QAM-based video services across different customer premise equipment in CATV delivery systems is challenging, especially with the evolution to high split RF spectra that eliminate the 70-130 MHz legacy downstream OOB control channel.
Innovation Solution
Incorporating the OOB control channel data within the downstream frequency range and using an end-of-line device to convert and transmit this data in the upstream frequency spectrum, allowing legacy consumer premise equipment to receive the OOB control channel data without the need for network modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high split RF spectra are used to eliminate the legacy downstream OOB control channel, then frequency spectrum efficiency is improved, but compatibility with legacy customer premise equipment deteriorates
Solution Approach 1:
An intermediary device (such as a filter or frequency converter) is introduced to translate or adapt the OOB control channel data from the new high split RF spectrum into a format compatible with legacy equipment's expected frequency range, enabling both modern spectrum efficiency and legacy equipment compatibility
Solution Approach 2:
The frequency parameter of the OOB control channel data is dynamically adjusted or transformed. The system modifies the frequency characteristics of the control data to match what legacy equipment expects, while the underlying high split RF spectrum architecture remains intact
2Adaptability or versatility
If legacy customer premise equipment is replaced to support new RF spectra, then adaptability to new architecture is improved, but deployment complexity and cost increase
Solution Approach 1:
The legacy customer premise equipment is enabled to self-adapt to the new high split RF spectrum architecture through automated frequency translation or conversion mechanisms, eliminating the need for manual replacement while maintaining compatibility
Solution Approach 2:
A universal intermediary component is deployed that can serve both legacy and modern equipment requirements, allowing the system to support multiple equipment types simultaneously without requiring complete replacement of existing infrastructure
3Reliability
If band rejection filters are used to maintain signal integrity, then signal quality is improved, but device complexity and potential signal loss increase
Solution Approach 1:
The problematic frequency components are extracted or separated from the main signal path using selective filtering only where necessary, rather than using broad band rejection filters that would add unnecessary complexity and potential signal loss
Data Source
AI summary
A system for out of band control for legacy set top boxes in which an out-of-band (OOB) downstream signal containing control information for consumer premises equipment is transmitted to an end-of-line device, which converts it to an upstream OOB signal, then sends the upstream OOB signal in an upstream direction.