Standby OLT Ranging Over Separate Management Channels in PON
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Solution Overview
Problem
Current PON systems experience long service interruptions due to the time-consuming process of measuring distance parameters between a standby optical line terminal (OLT) and optical network units (ONUs) after a main link failure, leading to excessive service downtime.
Innovation Solution
Implement a method where a standby OLT performs ranging on ONUs over a separate management channel while the primary OLT continues data transmission, allowing it to measure distance parameters without disrupting service, and switches data transmission to the standby OLT using these measured parameters for quick service restoration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the standby OLT measures distance parameters after main link failure, then service switching can be performed, but service interruption time becomes excessively long
Solution Approach 1:
The patent applies preliminary action by having the standby OLT perform ranging measurements on ONUs before any failure occurs. The standby OLT continuously monitors and measures distance parameters to ONUs in advance, so when a failure occurs, the switching can immediately use pre-measured data without waiting for post-failure measurements, thus eliminating service interruption time
Solution Approach 2:
The patent segments the OLT functionality into primary and standby units with separate management channels. The standby OLT independently performs ranging measurements through a dedicated second management channel, separate from the primary OLT's first management channel. This segmentation allows parallel operation where the standby OLT prepares measurement data without interfering with primary OLT's service operations
2Reliability
If the standby OLT performs ranging measurements, then distance parameters are obtained for switching, but service data transmission is disrupted
Solution Approach 1:
The patent divides communication channels into separate management channels and service channels. The ranging measurements are performed exclusively on the management channel (first management channel for primary OLT, second management channel for standby OLT), while service data transmission occurs on dedicated service channels. This channel segmentation isolates measurement activities from data transmission, allowing both to occur simultaneously without mutual interference
Solution Approach 2:
The patent introduces management channels as intermediary channels that facilitate ranging measurements without directly involving service data transmission. The management channel acts as a mediator that carries ranging requests and responses between OLT and ONUs, separating the measurement function from the service function, thereby allowing service data transmission to continue uninterrupted while ranging measurements are performed
Data Source
AI summary
In accordance with an embodiment, a method includes determining, by a standby optical line terminal (OLT), that a primary OLT has stopped sending a downlink optical signal over a first management channel; sending, by the standby OLT, a ranging request to a first optical network unit (ONU), over a second management channel, where the first ONU is one of the at least one ONU, and the second management channel is a channel between the standby OLT and the at least one ONU; and obtaining, by the standby OLT, a distance parameter between the first ONU and the standby OLT based on a ranging response received from the first ONU over the second management channel.