Ethernet Dual-Master Mode Bi-Directional Synchronization
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Solution Overview
Problem
Current gigabit Ethernet architectures are limited to unidirectional synchronization propagation, making them incompatible with synchronous communication services like TDM and wireless base stations, which require bi-directional clock synchronization for smooth call hand-offs.
Innovation Solution
A dual-master mode architecture is introduced in Ethernet devices, allowing either device to act as a timing master or slave, enabling bi-directional synchronization propagation through a synchronization handshake and the use of a high-quality external reference clock, which simplifies the synchronization process and allows for accurate frequency tracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If unidirectional synchronization propagation is used in Ethernet devices, then device complexity is reduced and ease of operation is improved, but compatibility with synchronous communication services like TDM and wireless base stations deteriorates
Solution Approach 1:
The patent implements dynamic role assignment where Ethernet devices can switch between master and slave roles based on synchronization needs. The system dynamically selects which device acts as timing master and which acts as timing slave, enabling flexible bi-directional synchronization propagation while maintaining manageable operational complexity through automated role negotiation protocols
Solution Approach 2:
The patent creates a universal synchronization architecture that can serve multiple communication services simultaneously. The dual-master mode enables the Ethernet synchronization system to be compatible with both traditional Ethernet asynchronous communication and synchronous services like TDM and wireless base station hand-offs, making the system multi-functional without requiring separate dedicated systems for each service type
2Reliability
If unidirectional synchronization propagation is implemented, then the synchronization process is simpler to implement, but reliability for synchronous communication services deteriorates
Solution Approach 1:
The patent implements feedback mechanisms through synchronization handshake protocols where devices exchange timing status information and confirmations. The master and slave roles negotiate and confirm their assignments through structured message exchanges, ensuring that both devices agree on the synchronization configuration before activating it, thereby improving reliability while keeping implementation complexity manageable through standardized protocols
Solution Approach 2:
The patent performs preliminary synchronization role assignment and configuration validation before actual data transmission begins. The devices exchange capability information and negotiate master/slave roles during link establishment phase, ensuring that synchronization parameters are predetermined and agreed upon before synchronous communication services are activated, which improves reliability by preventing configuration conflicts
Data Source
AI summary
Systems and methods for implementing bi-directional synchronization propagation between first and second communication devices are provided. The devices are arranged in a loop-timing configuration. A method includes detecting, by the second communication device, a switching signal comprising an indication to switch a timing role of the second communication device and engaging, by the second communication device, in a synchronization handshake with the first communication device over a communication link based on the detection of the switching signal. Engaging in the synchronization handshake includes determining whether the first communication device is configured to support bi-directional synchronization propagation. The method includes switching the timing role of the second communication device based on the synchronization handshake.