CATV Entry Adapter MoCA Signal Isolation via Segmented Filtering
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Solution Overview
Problem
MoCA signals interfere with the functionality of eMTA subscriber equipment connected to the passive port of a CATV entry adapter, degrading communication reliability due to their higher power levels and inability to be effectively isolated by existing filters.
Innovation Solution
A CATV entry adapter with multiple MoCA frequency rejection filters is used to isolate MoCA signals from the passive port, enhancing MoCA signal power distribution among active ports while preventing interference with eMTA devices, and ensuring proper functionality of non-MoCA enabled equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If MoCA signals are distributed through the CATV entry adapter to multiple active ports, then MoCA signal coverage and network functionality are improved, but MoCA signals interfere with eMTA equipment connected to the passive port due to higher power levels
Solution Approach 1:
The entry adapter is segmented into separate signal paths: a passive signal communication path that carries only CATV signals to the passive port, and active signal communication paths that carry both CATV and MoCA signals to active ports. This segmentation prevents MoCA signals from reaching the passive port and interfering with eMTA equipment while maintaining MoCA network functionality through active ports.
Solution Approach 2:
Band-pass filters are introduced as intermediary components in the active signal communication paths. These filters selectively pass MoCA signals to active ports while blocking them from the passive signal path, acting as mediators that enable MoCA signal distribution without causing interference to eMTA equipment.
2Object-affected harmful factors
If existing filters are used to isolate MoCA signals from the passive port, then interference with eMTA equipment is reduced, but MoCA signal power distribution among active ports is degraded
Solution Approach 1:
The signal distribution system is segmented into dedicated passive and active paths. The passive path uses simple splitting without filters, preserving signal power, while the active paths use band-pass filters to enable MoCA signal passage. This segmentation allows MoCA signals to reach active ports with sufficient power while preventing interference to the passive port.
Solution Approach 2:
Different signal paths are given different qualities: the passive path is optimized for CATV signal transmission with high power preservation, while active paths are optimized for both CATV and MoCA signal transmission. This local quality differentiation allows each path to be tuned for its specific function, maintaining MoCA signal power where needed while preventing interference where not needed.
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
The solution effectively eliminates MoCA signal interference with eMTA equipment, allowing for the use of non-MoCA enabled subscriber equipment without additional costs, while maintaining the quality of CATV signals and services, and enhancing MoCA signal strength within the network.
Implementation Method 1
A MoCA frequency rejection filter is connected between the active signal communication path and the second splitter/combiner. The MoCA frequency rejection filter rejects a significant majority of the power from MoCA signals present at the common terminal of the second splitter/combiner and passes the CATV upstream and downstream signals communicated to and from the active ports without substantial attenuation.
Implementation Method 2
A first bidirectional splitter/combiner of the entry adapter has a common terminal connected to the entry port to communicate the CATV downstream and upstream signals with the CATV network. The first splitter/combiner splits CATV downstream signals into split CATV downstream signals and supplies each split CATV downstream signal to the first and second separate signal component legs. The first splitter/combiner creates a single combined upstream signal from each upstream signal received at the first and second signal component legs
Implementation Method 3
A second bidirectional splitter/combiner has a common terminal and a plurality of separate signal component legs. Each signal component leg is connected to an active port. The second splitter/combiner splits each signal received at its common terminal into split signals and supplies each split signal to each of the signal component legs. The second splitter/combiner also creates a combined active signal from each CATV upstream signal and MoCA signal received at each signal component leg
Data Source
AI summary
A community access or cable television (CATV) entry adapter interfaces to a CATV network and serves as a hub in a Multimedia over Coax Alliance (MoCA) network. MoCA signals communicated between active ports of the entry adapter are rejected by MoCA frequency rejection filters to avoid interfering with the functionality of an eMTA subscriber device connected to a passive port of the entry adapter, without interfering with the passage of CATV upstream and downstream active and passive signals.