Synchronous Network Node Monitoring for Reference Clock Instability
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Solution Overview
Problem
Conventional methods for detecting instability in a synchronous network's reference clock are cumbersome, expensive, and lack scalability, as they require physical connection to each network node and reliance on GPS signals, which are not always available, and fail to identify the source of deviations within the network.
Innovation Solution
Each network node in the synchronous network is equipped with a timing circuit that recovers and transmits the reference clock and a clock stability monitoring circuit that detects instability by monitoring internal control parameters, allowing for distributed clock generation and fault identification without the need for external synchronization test equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If synchronization test equipment is used to detect reference clock instability, then measurement capability is provided, but device complexity and cost increase
Solution Approach 1:
Each network node monitors its own timing circuit's control parameters to detect reference clock instability, eliminating the need for external test equipment. The node performs self-diagnosis by analyzing parameters like PLL control voltage or DPLL control words locally
Solution Approach 2:
The monitoring function is extracted from external test equipment and integrated directly into each network node's timing circuit, allowing distributed monitoring without requiring centralized sophisticated instrumentation
2Measurement precision
If synchronization test equipment is physically connected to each network node, then measurement access is achieved, but ease of operation deteriorates
Solution Approach 1:
Each network node autonomously monitors its own timing parameters without requiring external physical connection. The monitoring is performed internally by the node's own circuitry, eliminating the need for technicians to physically connect test equipment to each node
Solution Approach 2:
The monitoring capability is built into every network node as a universal function, allowing any node to monitor itself and potentially other nodes in the network without requiring specialized external equipment
3Measurement precision
If GPS receiver is used for synchronization testing, then reference time source is obtained, but adaptability decreases due to GPS unavailability
Solution Approach 1:
The dependency on external GPS signals is removed by extracting the monitoring function to use only locally available timing circuit parameters. The system no longer requires external reference sources and can operate purely on internal timing circuit observations
Solution Approach 2:
The timing circuit's internal control parameters serve as an intermediary that replaces the need for direct GPS connection. These parameters indirectly reflect the health of the reference clock without requiring direct access to GPS signals
4Measurement precision
If end-to-end monitoring is performed, then overall synchronization accuracy is measured, but difficulty of detecting and measuring increases for locating faults
Solution Approach 1:
The monitoring function is segmented and distributed to each individual network node rather than performed centrally. Each node monitors its own timing parameters independently, allowing precise localization of faults to specific nodes or links in the network chain
Solution Approach 2:
Each node provides feedback about its own timing circuit status through monitored control parameters. This distributed feedback mechanism enables rapid identification of which specific node or link is experiencing synchronization issues, rather than requiring end-to-end testing to locate faults
Data Source
AI summary
A network node of a synchronous network, wherein said network node comprises a timing circuit which recovers a reference clock from a reception signal received by said network node from an upstream network node of said synchronous network and uses the recovered reference clock for a transmission signal transmitted by said network node to a downstream network node of said synchronous network; and a clock stability monitoring circuit which monitors internal control parameters (CP) of said timing circuit to detect an instability of the reference clock distributed within said synchronous network.