OTN Clock Phase Synchronization with Automatic Failover
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Solution Overview
Problem
In high-speed communication systems, maintaining phase synchronization among multiple network elements is complex due to component variations and temperature changes, requiring accurate delay control on the order of nanoseconds, which existing technologies struggle to achieve without complex protocols or user intervention.
Innovation Solution
A network element with multiple ports and computer processors that determine and calculate clock phase delay values between neighboring elements, assigning synchronization roles and establishing clock phase synchronization with desired accuracy, achieving redundancy and automatic failure handling without special protocols or user configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex protocols and user intervention are used to maintain phase synchronization, then synchronization accuracy can be achieved, but device complexity and operational difficulty increase
Solution Approach 1:
The system automatically detects link failures and recalculates clock phase delay values without user intervention. The network element autonomously determines synchronization roles, calculates delay values, and maintains phase synchronization through self-service mechanisms, eliminating the need for complex manual configuration protocols
Solution Approach 2:
The system dynamically adjusts clock phase delay values based on detected link conditions. When a link failure is detected, the system changes the delay parameters automatically to maintain synchronization, using parameter adaptation rather than complex protocol negotiations to achieve the desired accuracy
2Measurement precision
If complex protocols and user configuration are implemented to achieve phase synchronization, then synchronization accuracy improves, but ease of operation deteriorates
Solution Approach 1:
The network element performs automatic role assignment and delay calculation without requiring user configuration. The system serves itself by autonomously detecting link failures, determining synchronization roles, and adjusting clock phase delay values, making operation simple while maintaining high accuracy
Solution Approach 2:
The system pre-establishes multiple synchronization roles and prepares failover mechanisms in advance. When link failures occur, the pre-configured roles and automatic calculation mechanisms are already in place, allowing immediate action without complex user intervention or configuration steps
3Reliability
If redundancy mechanisms are added to handle failures, then system reliability improves, but device complexity increases
Solution Approach 1:
The system implements dynamic role assignment where network elements can transition between different synchronization roles based on link conditions. This dynamic approach provides redundancy and automatic failover without requiring complex static structural duplications, maintaining reliability while minimizing added complexity
Solution Approach 2:
The system uses parameter-based redundancy by maintaining multiple clock phase delay values and switching between them based on link status. This approach provides failure handling capability through parameter adaptation rather than structural complexity, keeping the system relatively simple while ensuring reliability
Data Source
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AI summary
A method is disclosed for use by a network element comprising a plurality of ports for communicating a common clock signal with one or more neighboring network elements. The method comprises, for at least one port of the plurality of ports, determining, while the port is in a predefined listening mode, whether the port is connected with a neighboring network element; and calculating, when the port is connected, a respective clock phase delay value between the network element and the neighboring network element. The method further comprises, based on a role assigned to the network element from a plurality of predefined roles, assigning a clock signal synchronization role to the port. The network element is configured to communicate the common clock signal using the respective clock phase delay value and using the clock signal synchronization role.