Optical Network Unit Link Switching for Rapid Service Continuity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing dual-homing protection schemes in network data backup, such as G.8031 and TYPE B/C protection, fail to enable rapid end-to-end service level switching due to limitations in cross-device linkage switching, leading to unpredictable service interruptions when faults occur on PON links.
Innovation Solution
A link switching method and system that involves an optical network unit and an aggregation side switch device, which monitor links, perform switching between sub-links, and send notification messages to enable rapid linkage switching between devices, utilizing monitoring packets, notification messages, and automatic protection switching messages to manage link faults and maintain service continuity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If segment protection scheme of G.8031 and TYPE B/C protection is used, then network data backup is implemented, but cross-device end-to-end service level switching cannot be implemented rapidly
Solution Approach 1:
The patent segments the protection mechanism into two distinct parts: PON-side protection (using TYPE B/C schemes) and uplink-side protection (using G.8031 VLAN protection). By dividing the end-to-end path into separable protection domains, each side can independently detect faults and trigger switching without being constrained by the other side's protection protocol limitations, enabling rapid cross-device service level switching.
Solution Approach 2:
The patent introduces an intermediary notification mechanism where the OLT acts as a mediator between the PON side and the uplink side. When a PON link fault is detected, the OLT receives the fault notification and triggers corresponding uplink link switching, coordinating the protection switching across different devices and protocol domains to achieve end-to-end service continuity.
2Reliability
If dual-homing protection schemes are used, then service continuity is maintained through backup links, but deployment complexity increases
Solution Approach 1:
The patent creates a universal protection framework that can accommodate both PON-side protection (TYPE B/C) and uplink-side protection (G.8031) within a single system. The OLT is designed to handle multiple protection schemes simultaneously, providing multi-functionality that simplifies deployment by offering a unified solution rather than requiring separate complex configurations for different protection domains.
Solution Approach 2:
The patent establishes preliminary protection relationships between active and standby links before faults occur. The system pre-configures backup service channels (VLAN Y) and standby OLT connections, so that when a fault occurs, switching can immediately occur without complex real-time decision-making, thereby reducing deployment and operational complexity.
3Reliability
If different protection schemes are used on PON side and uplink side, then local protection is achieved, but linkage switching between devices cannot be implemented
Solution Approach 1:
The patent implements a feedback mechanism where fault detection on one side (PON side or uplink side) triggers notifications to the other side through the OLT. This feedback loop enables coordinated linkage switching across devices, as each side can respond to faults detected on the other side, maintaining end-to-end service continuity despite using different local protection schemes.
Data Source
AI summary
Embodiments of the present invention provide a link switching method, device, and system. The method comprises: an optical network unit (ONU) transmits a monitoring packet through a first Maintenance association End Point on a first link connected to the ONU and an aggregation side switch device, so as to monitor the first link; the ONU performs switching from a first sub-link of the first link to a first sub-link of a second link if it is detected that a link fault occurs on the first link; the ONU sends a notification message to a second optical line terminal (OLT), so that the second OLT enables a transmission port; and the ONU sends an automatic protection switching message to the aggregation side switch device through a second Maintenance association End Point on the second link.