FDX Enhanced Node Mode Switching for HFC Network Upgrades
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Solution Overview
Problem
Hybrid Fiber-Coaxial (HFC) networks face challenges in upgrading to Full Duplex (FDX) mode due to the need for substantial fiber optic cable layout and coaxial cable re-cabling, which is costly and does not efficiently address DOCSIS upstream throughput shortfalls.
Innovation Solution
Deploying FDX enhanced nodes that can operate in two modes: as FDX amplifiers and FDX RPD nodes, allowing for gradual replacement of coaxial cables with fiber, enabling efficient upgrading to FDX and reducing CAPEX through remote software configuration and incremental migration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If substantial fiber optic cable layout and coaxial cable re-cabling is performed to upgrade to FDX mode, then FDX capability is achieved, but cost and complexity increase substantially
Solution Approach 1:
The node is designed with dynamic reconfigurability, allowing it to switch between different operational modes (amplifier mode and RPD node mode) based on fiber availability. This dynamic capability enables gradual migration to FDX without requiring complete immediate re-cabling, thus reducing overall complexity while achieving FDX capability
Solution Approach 2:
The enhanced node is designed to perform multiple functions: it can operate as a traditional amplifier, as a remote PHY device (RPD) node, or in hybrid configurations. This multi-functionality allows the same hardware infrastructure to support both legacy and FDX modes, reducing the need for separate cable layouts and lowering complexity
2Adaptability or versatility
If substantial fiber optic cable layout and coaxial cable re-cabling is performed to upgrade to FDX mode, then FDX capability is achieved, but cost increases substantially
Solution Approach 1:
The system allows partial deployment of fiber optic cables rather than requiring complete re-cabling. Nodes can be progressively upgraded to FDX mode as fiber becomes available, enabling cost-effective incremental migration while still achieving FDX capability in deployed areas
Solution Approach 2:
The node's operational parameters can be remotely reconfigured to switch between amplifier and RPD modes without physical hardware changes. This parameter-based reconfigurability reduces deployment costs by eliminating the need for expensive physical re-cabling to enable FDX capability
3Productivity
If nodes are migrated to FDX mode through traditional methods, then upstream throughput is improved, but migration complexity and service disruption increase
Solution Approach 1:
The migration process is made dynamic and flexible, allowing nodes to be gradually transitioned from amplifier to RPD mode based on operational requirements and fiber availability. This dynamic migration approach maintains service continuity while improving upstream throughput, reducing both complexity and disruption
Solution Approach 2:
The enhanced node acts as an intermediary that can temporarily support both amplifier and RPD functions simultaneously during migration. This intermediary capability allows seamless transition between modes without service disruption, simplifying the migration process while achieving improved upstream throughput
Data Source
AI summary
Full Duplex (FDX) enhanced node deployment may be provided. First, a first device level may be provided comprising a first plurality of FDX enhanced nodes. The first plurality of FDX enhanced nodes may comprise a first FDX enhanced node and a second FDX enhanced node. The first plurality of FDX enhanced nodes may be operated in a first mode. Next, a second device level may be provided comprising a third FDX enhanced node. The second device level may be upstream from the first device level. The third FDX enhanced node may be operated in a second mode. Then an input port of the first FDX enhanced node and an input port of the second FDX enhanced node may be provided with a same type of input that is being provided to an input port of the third FDX enhanced node. The first plurality of FDX enhanced nodes may then be switched from being operated in the first mode to being operated in the second mode.