PIU Module Ethernet Fabric Protection in Disaggregated OTN
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Solution Overview
Problem
Optical transport networks (OTNs) face challenges in efficiently managing and recovering from faults within Ethernet fabric planes, particularly in single port and multiple port single plane fault conditions, which can disrupt data transmission and require effective redundancy mechanisms.
Innovation Solution
The implementation of a disaggregated OTN switching system with plug-in universal (PIU) modules that generate and utilize parity information through XOR operations to detect and recover lost data packets, and dynamically reroute traffic across multiple Ethernet fabric planes, ensuring continuous data transmission and fault isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple Ethernet fabric planes are used for redundancy, then reliability is improved, but device complexity increases
Solution Approach 1:
The Ethernet fabric is segmented into multiple independent planes (Plane A and Plane B), each capable of carrying traffic separately. This segmentation allows the system to maintain reliability through redundancy while managing complexity by dividing the fabric into manageable, independent units that can be operated and monitored separately.
Solution Approach 2:
The system dynamically switches between different fabric planes based on detected fault conditions. When a fault is detected in one plane, the system automatically reroutes traffic through the remaining healthy plane(s), providing adaptive reliability without requiring permanent complex dual-path infrastructure for all scenarios.
2Reliability
If parity information is generated for every three Ethernet packets, then reliability is improved, but loss of time increases
Solution Approach 1:
Parity information is generated periodically for every three Ethernet packets rather than for every single packet. This periodic approach maintains data recovery capability while reducing the frequency of parity generation operations, thereby minimizing processing delay and time loss while still providing effective fault tolerance.
3Reliability
If fault detection mechanisms are implemented, then reliability is improved, but device complexity increases
Solution Approach 1:
The system implements feedback mechanisms where the status of Ethernet fabric planes is continuously monitored and fed back to the control logic. This feedback enables automatic fault detection and triggers appropriate rerouting actions, improving reliability through real-time monitoring while managing complexity through automated response rather than manual intervention.
Solution Approach 2:
The fault detection and recovery system operates autonomously, with the Ethernet fabric itself providing the monitoring capability through its dual-plane structure. The system self-detects faults in one plane and automatically switches to the other plane without requiring external complex monitoring infrastructure, thereby improving reliability while minimizing added complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables robust fault detection and recovery mechanisms, maintaining high bit error rates and reducing overhead, thus ensuring reliable data transmission and efficient fault management in OTNs.
Implementation Method 1
generate parity information for optical data unit (ODU) samples in every three Ethernet packets of the Ethernet packet traffic using exclusive or (XOR) operations that may be included in a corresponding fourth Ethernet packet of the Ethernet packet traffic
Data Source
AI summary
Methods and systems for Ethernet fabric protection in a disaggregated OTN switching system that include PIU modules each having multiple ports for OTN to Ethernet transceiving and an Ethernet fabric as a switching core are disclosed. An OTN over Ethernet module in each of the PIU modules may enable various OTN functionality to be realized using the Ethernet fabric which may include multiple Ethernet fabric planes. A PIU module may transmit Ethernet packets using a first working port over a first Ethernet fabric plane and may transmit Ethernet packets using a second working port over a second Ethernet fabric plane. When the PIU module detects a fault condition on the second Ethernet fabric plane, the PIU module may transmit Ethernet packets using a third protection port over the first Ethernet fabric plane instead of using the second working port.