Optical Network Unit Data Synchronization via Direct OLT Link
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Solution Overview
Problem
The existing data synchronization method in passive optical networks is slow and unreliable, especially when a fault occurs on the master OLT or the backbone optical fiber, due to slow data transmission speeds and reliance on intermediate switch devices.
Innovation Solution
The proposed solution involves an Optical Network Unit (ONU) that receives and stores synchronization data from a first OLT and transmits it to a standby OLT, bypassing intermediate switch devices, using a GEM port or logical link, thereby improving data transmission speed and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If data synchronization is performed through intermediate switch devices via SNMP protocol, then the system can maintain existing communication architecture, but the data transmission speed is slow and reliability is reduced
Solution Approach 1:
The patent extracts the data synchronization function from the SNMP protocol path and intermediate switch devices. By establishing a direct optical fiber connection between master OLT and standby OLT, the solution removes unnecessary intermediaries that caused slow transmission and reliability issues, enabling high-speed direct data sync without relying on switch devices or SNMP protocol
Solution Approach 2:
The patent introduces an optical fiber as a new intermediary medium for data synchronization, replacing the previous SNMP protocol and switch device path. This optical fiber intermediary provides direct, high-speed communication between OLTs, eliminating the harmful intermediaries (switches and SNMP protocol layers) that degraded performance and reliability
2Reliability
If multiple switch devices are used for data transmission between OLT and EMS, then network flexibility is improved, but the system becomes vulnerable to single point of failure and data sync reliability decreases
Solution Approach 1:
The patent extracts the data synchronization path from the complex multi-switch network path and creates a dedicated direct connection between master OLT and standby OLT. This removes the dependency on intermediate switch devices and EMS, eliminating single points of failure while maintaining system flexibility through the dedicated sync channel
Solution Approach 2:
The patent segments the network functions by separating data synchronization from general data communication. The direct optical fiber connection handles sync traffic independently, while other traffic continues through existing switch infrastructure. This segmentation isolates the critical sync path from potential failures in other network components
3Duration of action of moving object
If standby OLT is used for backup, then service continuity is improved, but data synchronization speed becomes the limiting factor for recovery time
Solution Approach 1:
The patent implements preliminary action by establishing a direct optical fiber connection between master and standby OLTs in advance, before any fault occurs. This pre-configured high-speed sync channel ensures that when a fault happens, the standby OLT can immediately receive synchronization data at maximum speed, dramatically reducing recovery time compared to traditional on-demand sync methods
Data Source
AI summary
Embodiments of the present disclosure provide a data synchronization method and system, and an optical network unit. An ONU receives synchronization data that is transmitted by a first OLT through a GEM port corresponding to a predetermined GEM port ID or a logical link corresponding to a predetermined LLID, and stores the synchronization data. When a fault occurs on the first OLT or on a backbone optical fiber connected to the first OLT, the ONU transmits the synchronization data to a second OLT so that the second OLT recovers services according to the synchronization data.