Combined Equalizer Attenuator Reverse Path Optical Nodes
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Solution Overview
Problem
Cable television systems face challenges in maintaining signal quality and reducing noise in the return path due to varying signal attenuation across different frequencies, which affects the ability of headend receivers to detect upstream signals effectively, especially in coaxial cable networks where signal loss increases with frequency and requires frequent adjustments of equalizers to account for temperature changes, leading to service interruptions.
Innovation Solution
A combined equalizer and attenuator device is introduced for reverse path optical nodes, allowing for pre-equalization of signals before they reach the headend, using a single JXP-style plug-in device that combines attenuation and equalization sub-circuits, which can be easily installed in existing optical nodes without affecting the forward path response, and is designed to be compact and inexpensive for widespread deployment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate equalizer and attenuator devices are used in reverse path optical nodes, then signal quality can be maintained, but device complexity and installation difficulty increase
Solution Approach 1:
The patent combines separate equalizer and attenuator circuits into a single integrated device that can be installed in reverse path optical nodes. This unified device performs both equalization and attenuation functions simultaneously, reducing the number of components needed while maintaining signal quality. The integration eliminates the need for multiple separate installations and reduces overall device complexity in the optical node.
Solution Approach 2:
The integrated device serves multiple functions within a single unit: it provides both equalization (to compensate for frequency-dependent signal loss) and attenuation (to reduce overall signal level). This multi-functional approach allows a single device to replace what would traditionally require separate equalizer and attenuator units, simplifying the system architecture.
2Stability of the object's composition
If frequent adjustments of equalizers are made to account for temperature changes, then signal consistency is maintained, but service interruptions increase
Solution Approach 1:
The patent incorporates temperature-compensated design elements that allow the equalizer circuit to dynamically adjust its characteristics in response to temperature changes. This dynamic compensation maintains signal consistency across varying environmental conditions without requiring manual intervention or service interruptions for recalibration.
3Ease of manufacture
If compact and inexpensive equalizer devices are deployed, then widespread installation is feasible, but manufacturing precision may be compromised
Solution Approach 1:
The patent designs the equalizer and attenuator device to be cost-effective and simple to manufacture, enabling widespread deployment in numerous optical nodes. The design accepts certain tolerances in component values while maintaining adequate performance through circuit topology that is robust to manufacturing variations, rather than requiring precision components.
Data Source
AI summary
An optical node assembly for cable television communications comprises at least one optical receiver, at least one optical transmitter having a single first location shaped to receive a first JXP-style component, a router board, a forward configuration board connected to the optical receiver and the router board, a return configuration board connected to the optical transmitter and the router board, at least one RF module connected to the optical receiver and the optical transmitter through the router board and having a forward circuit path and a return circuit path having a single second location shaped to receive a second JXP-style component, and at least one JXP-style component having a circuit comprising both an attenuation sub-circuit and an equalization sub-circuit, the at least one JXP-style component being inserted in at least one of the single first location and the single second location.