Optical MAC Layer Distribution in PON Network Interface Devices
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Solution Overview
Problem
The complexity and high power requirements of network interface devices (NIDs) in traditional fiber-to-the-home (FTTH) architectures increase installation costs and power consumption due to the need for complex circuitry to manage and format optical network signals for communication across non-optical channels.
Innovation Solution
Implementing an optical media access control (MAC) layer at the customer premises equipment (CPE) rather than in the NID, which converts optical signals to electrical signals for communication across non-optical channels, reducing NID complexity and power needs, and using power over Ethernet (PoE) to eliminate separate power sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an optical MAC layer is implemented in the NID to handle PON protocols and manage optical signals, then optical network termination functionality is achieved, but device complexity and power consumption increase
Solution Approach 1:
The patent divides the optical network termination functionality into two separate devices: the NID handles only optical-to-electrical conversion and basic signal transmission, while the optical MAC layer is implemented in a separate customer premises equipment (CPE). This segmentation removes the complex optical MAC processing from the NID, reducing its complexity while maintaining full optical network termination capability through the distributed architecture.
2Adaptability or versatility
If complex circuitry is added to the NID for formatting and managing optical network signals, then optical network service functionality is improved, but installation cost increases
Solution Approach 1:
The patent extracts the complex optical MAC layer processing functions from the NID and places them in a separate CPE device. The NID is left with only the essential optical-to-electrical conversion and signal transmission functions. This extraction eliminates the need for expensive complex circuitry in the NID while preserving full optical network service functionality through the distributed implementation.
3Productivity
If the NID performs formatting and management operations for optical signals, then communication efficiency is maintained, but power consumption increases
Solution Approach 1:
The patent segments the power-consuming optical MAC processing functions from the NID and relocates them to a separate CPE device. The NID performs only simple optical-to-electrical conversion and signal transmission, which require minimal power. The CPE, which has its own power source, handles the formatting and management operations, thereby maintaining communication efficiency while significantly reducing NID power consumption.
Data Source
AI summary
An optical communication system comprises a network interface device (NID) having a media converter coupled to an optical fiber of a passive optical network (PON). The media converter converts optical signals from the PON into electrical signals for communication across at least one non-optical channel, such as a conductive or wireless connection, to customer premises equipment (CPE), such as a residential gateway or other customer premises (CP) device. Rather than implementing an optical media access control (optical MAC) layer in the NID, an optical MAC layer for handling PON protocols and management is implemented by the CPE, thereby effectively extending the customer end of the PON across at least one non-optical connection to the CPE. By implementing the optical MAC layer at the CPE, the complexity of the NID is reduced thereby lowering the cost of the NID. In one embodiment, in an effort to further reduce the complexity of the NID, the optical MAC layer is configured to control a laser-on state of an optical transmitter in the NID.