Optical Transport Network Protect ODU Time-Slot Allocation
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Solution Overview
Problem
Existing optical transport networks (OTN) lack effective protocols and mechanisms to protect multiple lower capacity work Optical Channel Data Units (ODUs) using a higher capacity protect ODU, as they fail to communicate time-slots and manage bandwidth efficiently during failures, especially when work and protect entities have dissimilar capacities.
Innovation Solution
A method and system that detect signal failures in work ODUs, request and allocate time-slots from a higher capacity protect ODU in an incremental priority manner, dropping lower priority traffic to free up slots, and utilize a TPN-based policy to channelize lower order ODUs, enabling efficient protection and optimized bandwidth usage without requiring communication of time-slots over protection protocol bytes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a higher capacity protect ODU is used to protect multiple lower capacity work ODUs, then the protection capacity and bandwidth utilization are improved, but the complexity of time-slot management and protocol convergence increases
Solution Approach 1:
The protect ODU is segmented into multiple time-slots that can be independently allocated to different work ODUs. The system divides the protection bandwidth into discrete time-slot units, allowing flexible assignment to multiple lower capacity work ODUs based on their individual protection needs, thereby resolving the complexity of managing heterogeneous capacity combinations
Solution Approach 2:
The time-slot allocation is made dynamic rather than static. The system continuously monitors the protection group status and dynamically reallocates time-slots between different work ODUs based on current failure conditions and priority levels, enabling adaptive protection capacity distribution that simplifies management of multiple protected entities
2Speed
If time-slots are allocated in an incremental priority manner, then the protection response speed is improved, but the bandwidth utilization efficiency may deteriorate due to dropping lower priority traffic
Solution Approach 1:
The system performs preliminary actions by pre-establishing priority levels and allocation policies for different work ODUs before failures occur. When a failure is detected, the pre-configured priority structure enables immediate incremental allocation of time-slots to highest priority affected work ODUs without delay, achieving fast protection response while the policy framework ensures optimal bandwidth utilization by dropping only lower priority traffic when necessary
3Adaptability or versatility
If a protection protocol is designed for dissimilar capacity work and protect entities, then the adaptability is improved, but the protocol complexity and convergence time increase
Solution Approach 1:
The protocol uses parameter changes by dynamically adjusting the protection group configuration based on the capacity relationships between work and protect ODUs. The system modifies allocation parameters, priority levels, and time-slot mappings according to the specific capacity mismatch conditions, enabling broad capacity compatibility while maintaining rapid convergence through standardized parameter adjustment procedures
Data Source
AI summary
The various embodiments herein provide a method and system for protecting multiple work ODU failures using a higher capacity protect ODU in an Optical Transport Network. The method for protecting multiple work ODU failures in an Optical Transport Network comprising steps of detecting signal failures in at least one of a plurality of work ODUs, requesting for release of one or more time-slots for a defective work ODU and allocating the one or more time-slots of a low priority traffic from the protect ODU in an incremental manner of priority. The method apply a TPN based policy for defining lower ODUs, performs handshaking between the transmit and downstream ends using the protocol provided, defines the role and behavior of the various system components and the service requests and performs an automatic lockout of protection for the work ODU in which an UDI alarm is present.