Cable Amplifier Layout Without Diplex Filters for 5-650 MHz Duplex
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Solution Overview
Problem
Traditional cable network amplifiers with diplex filters limit network flexibility and bandwidth, preventing the use of full-duplex technology and requiring frequent modifications to accommodate bidirectional signal transmission.
Innovation Solution
The use of modular amplifier devices without diplex filters, employing splitters with high port-to-port isolation and separate forward and return amplifiers, enables simultaneous bidirectional communication within a full duplex frequency range of 5 MHz to 650 MHz, allowing for flexible band splits and reduced noise amplification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If diplex filters are used in amplifiers to separate forward and return signal paths, then signal path separation is achieved, but network flexibility and bandwidth are limited
Solution Approach 1:
The patent removes diplex filters from the amplifier design, extracting the frequency separation function from the amplifier itself. This allows amplifiers to handle full-duplex signals without dedicated band-splitting components, thereby increasing network flexibility while maintaining signal path separation through alternative means such as digital signal processing or passive splitters upstream.
Solution Approach 2:
The amplifier is designed to universally handle both forward and return signals within the full 5-650 MHz duplex frequency range without dedicated frequency-specific components. This multi-functional approach allows the same amplifier to serve multiple frequency bands and signal directions, enhancing adaptability while maintaining reliable signal separation through system-level architecture rather than component-level specialization.
2Reliability
If diplex filters are used to dedicate amplifiers to particular band splits, then forward and return signal paths are separated, but bandwidth is reduced
Solution Approach 1:
The frequency separation function is extracted from the amplifier and relocated to upstream components or digital processing stages. This allows the amplifier to operate across the full 5-650 MHz bandwidth without diplex filter constraints, maximizing the quantity of usable frequency resources while maintaining reliable signal path separation through alternative architectural approaches.
3Reliability
If traditional amplifiers with diplex filters are used, then discrete forward and return band configurations are achieved, but frequent modifications are required to accommodate bidirectional transmission
Solution Approach 1:
The amplifier is designed as a universal device capable of handling both forward and return signals across the full duplex frequency range without requiring discrete band-splitting configurations. This eliminates the need for frequent modifications and reconfigurations, simplifying installation and reducing complexity while maintaining reliable band configuration through system-level signal management rather than component-level frequency separation.
4Reliability
If diplex filters are used in amplifiers, then forward and return signals are separated by frequency, but network adaptability to full-duplex technology is prevented
Solution Approach 1:
The frequency-based signal separation function is extracted from the amplifier and implemented at other points in the signal chain or through digital processing. This enables the amplifier to fully support full-duplex operation across the 5-650 MHz range without diplex filter limitations, achieving both reliable signal separation and complete full-duplex compatibility simultaneously.
Data Source
AI summary
A cable network system for bidirectionally communicating signals at an enhanced duplex frequency range, which may be between about 5 MHz and about 650 MHz. This system may include a first amplifier, which may be configured to condition an upstream signal proceeding from a subscriber premises to a headend, without necessarily conditioning a downstream signal proceeding from the headend to the subscriber premises, a second amplifier, which may be configured to condition the downstream signal without necessarily conditioning the upstream signal, and a shaping circuit, which may condition the upstream and downstream signals. This system also may simultaneously, or in an overlapping or offset manner, communicate signals at a full duplex frequency range without a diplex filter.