Meshed OLT Architecture for Scalable Remote Broadband Access
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Solution Overview
Problem
Existing OLTs with a leaf-spline switching fabric are cumbersome to install in remote locations due to power and space limitations, and they struggle with signal integrity and corrosion in non-controlled environments, while also being insufficient for increasing bandwidth requirements, necessitating frequent replacements.
Innovation Solution
A modular OLT architecture with a single backplane circuit board and PON ports, interconnected with a switch, allowing for parallel expansion by adding more units and utilizing virtualized management to distribute processing and ensure redundancy and failover capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a leaf-spline switching fabric is used in OLTs, then signal distribution capability is improved, but device complexity and installation difficulty increase in remote locations
Solution Approach 1:
The system is divided into multiple independent OLT units, each with its own switching fabric, rather than one large complex unit. Each unit can be independently installed and managed, reducing installation complexity while maintaining signal distribution capability through parallel operation of multiple units.
Solution Approach 2:
A meshed interconnection network acts as an intermediary between multiple OLT units, enabling them to work together as a coordinated system. This meshed network simplifies the overall architecture by providing a standardized interconnection method rather than requiring complex internal switching fabric in each unit.
2Power
If traditional OLT architecture is used, then initial bandwidth requirements are met, but bandwidth scalability is limited requiring frequent replacements
Solution Approach 1:
The system employs dynamic bandwidth allocation through virtualized management that can adapt to changing bandwidth requirements. Multiple OLT units can be dynamically added or removed from the meshed interconnection, allowing bandwidth capacity to scale flexibly without replacing existing units.
Solution Approach 2:
Each OLT unit is designed with universal interfaces and standardized protocols that enable them to perform multiple functions and be interconnected in various configurations. This universality allows the system to scale bandwidth by adding units rather than replacing them.
3Ease of operation
If OLTs are installed in remote locations, then access coverage is improved, but signal integrity deteriorates due to corrosion in non-controlled environments
Solution Approach 1:
The system incorporates redundancy and error correction mechanisms beforehand to cushion against signal degradation from environmental factors. Multiple communication paths through the meshed interconnection provide backup routes if signal integrity is compromised in remote locations.
4Power
If more bandwidth capacity is required, then system capability is improved, but device complexity increases requiring frequent replacements
Solution Approach 1:
Bandwidth capacity is segmented across multiple independent OLT units rather than concentrated in one complex unit. Each unit maintains manageable complexity while the aggregate system provides high bandwidth capacity through parallel operation.
Data Source
AI summary
A system with OLTs having a meshed interconnection.