ONT OMCI Handler Switching for Vendor Compatibility
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Solution Overview
Problem
Current optical network termination (ONT) technologies face challenges in calibrating the crossing point directly and suffer from reduced signal quality, leading to higher bit error rates, lower signal sensitivity, and reduced coverage range, particularly in gigabit-capable passive optical networks (GPON) due to the inability to adjust the crossing percentage effectively.
Innovation Solution
The process involves receiving an upstream overhead PLOAM message to identify the transceiver type, matching it with appropriate optical parameters, and storing these in DDR memory before completing the ranging process, along with OMCI handler switching to ensure compatibility and adaptability to different OLT vendors and versions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the crossing point is calibrated to 40% by shortening Signal One timing, then the crossing point calibration requirement is met, but signal quality is reduced and bit error rate increases
Solution Approach 1:
The patent changes the crossing point parameter from the conventional 40% to 50%, and modifies the timing relationship between Signal One and Signal Zero to achieve equal duration. This parameter change resolves the contradiction by meeting calibration requirements while maintaining signal quality and reducing bit error rate.
2Measurement precision
If the timing of Signal One is shortened to achieve crossing point calibration, then the crossing percentage is adjusted, but signal detection becomes harder and sensitivity is reduced
Solution Approach 1:
The patent changes the crossing percentage parameter to 50% and adjusts the timing parameters of Signal One and Signal Zero to have equal duration. This resolves the detection difficulty by ensuring adequate signal duration while achieving proper crossing point calibration.
3Loss of information
If delimiter bytes (24-bit data) are used for ONT configuration, then configuration data can be transmitted, but data processing complexity increases due to CPU word alignment requirements
Solution Approach 1:
The patent segments the 24-bit delimiter byte configuration data into multiple 8-bit or 16-bit units that align with CPU word processing requirements. This segmentation resolves the contradiction by enabling complete configuration data transmission while simplifying processor handling through proper data alignment.
Solution Approach 2:
The patent introduces an intermediary data structure or conversion layer that translates between the 24-bit delimiter byte format and CPU-friendly word-aligned formats. This intermediary resolves the processing complexity by providing a buffer that handles the format conversion transparently.
Data Source
AI summary
A method for performing ONU Management and Control Interface (OMCI) synchronization includes receiving an OMCI message containing a OLT-G entity identifying OLT's vendor identification (ID) and version. The method also includes determining if an OLT vendor identification (ID) matches with a current vendor ID and if an Optical Line Terminal (OLT) version is compatible with current OMCI handlers. When the OLT vendor ID fails to match with the current vendor ID, automatically performing a OMCI handler switching process. The OMCI handler switching process includes setting a current OLT vendor as a new OLT vendor ID, deleting a OMCI configuration previously stored in the flash memory after setting the new OLT vendor ID, and rebooting the ONT to allow the ONT to initialize a OMCI configuration using a new OMCI profile.