Single MAC Device Feeding Multiple PHY Layer Devices
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Solution Overview
Problem
Current Remote MacPhy Devices (RMDs) are limited in supporting multiple service groups with different DOCSIS features, requiring all service groups to have the same set of features, which restricts the ability to support newer features like DOCSIS 4.0 FDX even if advantageous, and switching chipsets can lead to incompatible MAC layer implementations.
Innovation Solution
A single MAC device is used to feed multiple physical layer devices, allowing for the upgrading of physical layer devices without interrupting the operation of the MAC device or other physical layer devices, by employing a local processor within a Generic Access Platform (GAP) node housing that converts signals between MAC and PHY layers, enabling support for different communication protocols such as DOCSIS 3.1 and DOCSIS 4.0 FDX.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single chipset is used to support multiple service groups, then device complexity is reduced, but adaptability to different DOCSIS features is limited
Solution Approach 1:
The invention segments the RMD into two independent components: a MAC layer device and separate PHY layer devices. The MAC layer device handles medium access control functions, while multiple PHY layer devices handle different physical layer protocols (DOCSIS 3.1, DOCSIS 4.0 FDX, etc.). This segmentation allows each PHY device to support different DOCSIS features independently while sharing a common MAC layer, thereby resolving the contradiction between device complexity and adaptability.
2Ease of manufacture
If all service groups use the same chipset, then manufacturing is simplified, but the ability to support newer features like DOCSIS 4.0 FDX is restricted
Solution Approach 1:
The MAC layer device is designed as a universal component that can work with multiple types of PHY layer devices. It provides a standardized interface that accommodates different DOCSIS versions and features (3.1, 4.0 FDX, etc.). This universality allows manufacturers to produce a common MAC layer device that can be paired with different PHY devices to support various service group requirements, simplifying manufacturing while maintaining feature flexibility.
3Adaptability or versatility
If the RMD is upgraded to support new features, then adaptability improves, but service interruption occurs
Solution Approach 1:
The invention enables dynamic configuration where PHY layer devices can be independently added, removed, or upgraded without affecting the MAC layer device or other PHY devices. The system dynamically adapts to different PHY device capabilities, allowing operators to upgrade specific service groups to newer DOCSIS versions (e.g., adding DOCSIS 4.0 FDX capability) while other service groups continue operating with existing features, thus avoiding service interruption.
4Adaptability or versatility
If different chipsets are used to obtain needed PHY layer features, then feature adaptability improves, but MAC layer compatibility problems arise
Solution Approach 1:
The MAC layer device serves as an intermediary between the network and multiple PHY layer devices with different chipsets and protocols. It provides a standardized interface that abstracts the underlying PHY device differences, ensuring reliable MAC layer operation regardless of which PHY chipset is used. This intermediary role resolves compatibility issues by handling protocol translation and coordination, allowing different PHY chipsets to work together under a unified MAC layer management.
Data Source
AI summary
A network communications node includes a local processor, a first remote physical device (RPD), and at least a second RPD all contained in a node housing. The local processor receives a first signal on a logical link control layer and transforms it to a second signal on a medium access control (MAC) layer. The first and second RPDs receive the second signal and respectively convert it to third and fourth signals on a physical layer. The two RPDs implement different communication protocols. Amplification for the RPDs occurs mostly outside the node housing. The node is upgraded by software patching the local processor or by physically swapping one or more of the RPDs.