Optical Network Termination Byte 10 Extraction for Signal Calibration
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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 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 from an OLT, extracting byte 10 data to identify the transceiver type, matching it with sets of optical parameters, and storing these in DDR memory before completing the ranging process, allowing for dynamic adaptation of optical parameters to ensure proper signal transmission and reception.
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 the signal quality deteriorates and bit error rate increases
Solution Approach 1:
The patent changes the calibration parameter from crossing point percentage to eye diagram opening width. Instead of forcing the crossing point to 40% by adjusting signal timing, the system measures the eye diagram opening width at the default 50% crossing point and uses this measurement to determine appropriate equalization parameters, thereby maintaining signal quality while achieving calibration.
Solution Approach 2:
The patent replaces the mechanical timing adjustment approach with an optical measurement approach. Instead of directly manipulating signal timing to achieve crossing point calibration, the system uses an eye diagram measurement device to measure the optical signal characteristics and derives calibration information from these measurements without altering the fundamental signal timing.
2Measurement precision
If the Signal One timing is shortened to achieve 40% crossing point, then the crossing point calibration is achieved, but the detection difficulty increases and signal may be mistaken for Signal Zero
Solution Approach 1:
The patent changes the calibration parameter from crossing point percentage to eye diagram opening width. Instead of forcing the crossing point to 40% by adjusting signal timing, the system measures the eye diagram opening width at the default 50% crossing point and uses this measurement to determine appropriate equalization parameters, thereby maintaining signal quality while achieving calibration.
3Ease of operation
If delimiter bytes are used for ONT configuration, then the configuration data can be transmitted, but the data processing complexity increases due to 24-bit to 8/16/32/64-bit conversion requirements
Solution Approach 1:
The patent extracts only the necessary configuration information from the PLOAM message structure. Instead of processing the entire 24-bit delimiter byte sequence, the system identifies and extracts specific bytes (such as byte 10 for transceiver type identification) that contain the essential configuration parameters, thereby simplifying the data processing while maintaining full configuration capability.
Solution Approach 2:
The patent creates simplified copies of the configuration data by extracting only the essential parameters needed for ONT setup. Rather than processing the complete delimiter byte structure, the system creates a streamlined representation containing only the critical configuration information, reducing processing complexity while preserving functionality.
Data Source
AI summary
A process for configuring an optical network termination (ONT) includes receiving an upstream overhead physical layer operation administration and maintenance (PLOAM) message from an optical line terminal (OLT). The process also includes extracting byte 10 data from the upstream overhead PLOAM message to identify a transceiver type of the OLT, and matching the transceiver type of the OLT with one of a plurality of sets of optical parameters. The process further includes storing the matched transceiver type of the OLT in a double date rate (DDR) memory prior to completing a ranging process with the OLT.