Distributed Synchronization With Line-Card PTP and SyncE
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Solution Overview
Problem
The conventional distributed disaggregated chassis (DDC) systems face synchronization accuracy issues due to the time errors introduced by the management switch, leading to imprecise time, phase, and frequency synchronization among line cards.
Innovation Solution
A distributed synchronization system is implemented using a management device and a series of synchronization devices connected via RJ45 interfaces, where each device performs synchronization operations based on received signals and control signals, utilizing digital phase-locked loops and processors to achieve precise synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a management switch is added to the DDC system to provide IEEE 1588 and SyncE functions, then synchronization capability is improved, but synchronization accuracy deteriorates due to time errors of 5-10 ns introduced by the management switch
Solution Approach 1:
The patent extracts the synchronization function from the management switch and implements it directly in the line cards. Each line card is equipped with a synchronization device that can independently perform PTP time stamping and SyncE operations, eliminating the need for the management switch to provide these functions and thereby removing the source of 5-10 ns time errors.
Solution Approach 2:
The patent segments the synchronization function into independent synchronization devices within each line card, rather than having a centralized synchronization function in the management switch. This segmentation allows each line card to achieve precise synchronization independently, improving overall synchronization accuracy while maintaining system reliability.
2Reliability
If IEEE 1588 and SyncE functions are implemented in the management switch, then synchronization is achieved, but hardware resource utilization deteriorates and costs increase
Solution Approach 1:
The patent implements self-service by equipping each line card with its own synchronization device that can autonomously perform PTP and SyncE operations. Each line card serves itself for synchronization purposes, eliminating the need for the management switch to provide these functions and reducing overall hardware complexity and resource requirements.
Solution Approach 2:
The synchronization device in each line card is designed to perform multiple functions including PTP time stamping, SyncE operations, and digital phase-locked loop functions, making it a universal component that handles all synchronization needs without requiring separate dedicated hardware for each function.
Data Source
AI summary
A distributed synchronization system including a management device and a plurality of synchronization devices is provided. The management device includes a network input interface and a network output interface, and is configured to: decode a precision time protocol packet to obtain a reference 1 pulse per second signal, a reference frequency signal, and reference time of day information; send a reference synchronization signal and a reference control signal to a first synchronization device through the network output interface. The reference synchronization signal includes the reference 1 pulse per second signal, the reference frequency signal and the reference time of day information. The reference control signal requests the first synchronization device to synchronize with the management device.