Daisy-Chained Remote OLTs for PON Collision Reduction
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Solution Overview
Problem
Single remote OLTs may not provide sufficient quality of service or capabilities to support a large number of ONTs, leading to data collisions and inefficiencies in passive optical networks.
Innovation Solution
Implementing a daisy chaining of remote OLTs with hierarchical relationships, using internal or external routers to manage data traffic, prioritize based on service level agreements, and allocate committed information rates or reserved bandwidth to ensure efficient data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single remote OLT is used to serve multiple ONTs, then device complexity is reduced, but quality of service deteriorates due to data collisions and insufficient capabilities
Solution Approach 1:
The patent divides a single remote OLT into multiple remote OLTs that can be daisy-chained together. Each remote OLT serves a subset of ONTs, reducing data collisions and improving quality of service while maintaining distributed architecture benefits
Solution Approach 2:
The patent implements a hierarchical structure where remote OLTs are nested in a daisy-chain configuration. The first remote OLT connects to the core network, the second remote OLT connects to the first, and so on, creating a nested topology that extends network capabilities while managing complexity
2Reliability
If more remote OLTs are deployed to improve quality of service, then service capabilities increase, but device complexity and network configuration difficulty increase
Solution Approach 1:
The patent implements dynamic service virtualization that allows the network to adaptively allocate services across multiple remote OLTs based on demand. This dynamic approach enables quality of service improvement without requiring static complex configurations for each additional OLT
Solution Approach 2:
The patent creates a universal daisy-chain architecture where each remote OLT can serve multiple functions: serving local ONTs, forwarding traffic to other remote OLTs in the chain, and participating in unified service virtualization. This multi-functionality reduces overall system complexity despite adding multiple devices
3Device complexity
If data traffic is broadcast to all ONTs through optical splitter, then network simplicity is maintained, but data transmission efficiency deteriorates due to data collisions
Solution Approach 1:
The patent segments the broadcast domain by introducing multiple remote OLTs that can selectively forward data to specific ONTs or groups of ONTs. This reduces unnecessary data transmissions and collisions while maintaining the simplicity of the optical splitter architecture
Solution Approach 2:
The patent introduces remote OLTs as intermediary devices between the core network and ONTs. These intermediaries intelligently forward data packets, reducing broadcast overhead and data collisions while preserving the underlying passive optical network structure
Data Source
AI summary
A system supporting the daisy chaining of remote optical line terminals.