OLT Chassis Optical Switches for N+1 Redundancy
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Solution Overview
Problem
Passive optical networks face challenges in hardware and software fault management, leading to network downtime and increased costs due to complex and costly troubleshooting processes, especially since faults often occur within the optical line terminal's chassis rather than in fibers.
Innovation Solution
The implementation of optical switches within the optical line terminal's chassis to automatically reroute optical signals from spare or adjacent subsystems when a fault is detected, minimizing downtime and reducing the need for external cabling and redundant fibers by using a N+1 sparing solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional troubleshooting methods are used to detect hardware failures in passive optical networks, then the failure location can be identified, but network downtime increases and operational costs rise due to the complex and time-consuming inspection process
Solution Approach 1:
The optical line terminal automatically detects hardware failures and reroutes optical signals without human intervention. The system monitors its own components and performs self-healing by switching to spare subsystems when faults are detected, eliminating the need for manual troubleshooting and reducing network downtime.
Solution Approach 2:
The system continuously monitors the status of optical subsystems and provides feedback to the control logic. When a fault is detected in a primary optical subsystem, the feedback mechanism triggers automatic switching to a spare subsystem, enabling rapid response to failures and maintaining network availability.
2Ease of repair
If manual inspection of multiple optical components is performed to locate failures, then the exact failure point can be determined, but operational complexity and costs increase significantly
Solution Approach 1:
The optical line terminal automatically detects and responds to hardware failures without requiring manual inspection. The system monitors its own optical subsystems and performs self-diagnosis, eliminating the need for operators to manually trace through multiple components to locate failures.
Solution Approach 2:
The optical line terminal is divided into multiple independent optical subsystems, each with its own monitoring capabilities. This segmentation allows the system to isolate and identify failures in specific subsystems automatically, reducing the complexity of troubleshooting by limiting the search space to only the affected segment.
3Reliability
If redundant optical fibers and external cabling are used to provide backup paths, then network reliability improves, but installation complexity and optical losses increase
Solution Approach 1:
The system combines the primary and backup optical subsystems into a single integrated chassis, eliminating the need for separate external cabling paths. The spare optical subsystems are co-located within the same device, allowing automatic switching without requiring additional external fiber connections or complex cabling arrangements.
Solution Approach 2:
Instead of providing redundancy through additional external spatial paths (multiple fibers), the system provides redundancy through temporal switching within the same physical chassis. The spare optical subsystems are activated in the same operational dimension as the primary subsystems, eliminating the need for separate physical pathways and reducing cabling complexity.
Data Source
AI summary
An optical line terminal is operable in a passive optical network. The optical line terminal includes a chassis. A plurality of optical subsystems are disposed within the chassis. Each optical subsystem is operable to generate optical signals for delivery to a port. Each optical subsystem includes one or more optical switches. When a fault condition is detected at a first optical subsystem preventing the delivery of first optical signals generated by the first optical subsystem to the port of the first optical subsystem, the optical switches switch to deliver second downstream optical signals generated by a second optical subsystem to the port of the first optical subsystem.