Subscriber Premises Optical Network Unit Evaluation Mode Switching
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Solution Overview
Problem
Existing subscriber premises-side optical network units require a jig board to switch to evaluation mode, making maintenance cumbersome and incurring additional production costs.
Innovation Solution
A subscriber premises-side optical network unit connected via an optical transmission line and an electric signal line, equipped with a memory that can be rewritten by an external device, and a control part that switches the optical sending part to continuous light emission mode upon detection of rewritten memory content, eliminating the need for a jig board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a jig board is used to switch to evaluation mode, then the ONU can be switched to evaluation mode, but it becomes cumbersome and incurs additional production costs
Solution Approach 1:
The invention extracts the evaluation mode switching function from the external jig board and integrates it into the ONU's internal memory system. By storing evaluation mode activation instructions in the ONU's memory, the system eliminates the need for the external jig board, thereby reducing device complexity and maintenance burden while preserving the ease of switching to evaluation mode.
Solution Approach 2:
The ONU becomes self-sufficient by containing all necessary evaluation mode switching information within its own memory. The detection part monitors memory content changes and automatically triggers the evaluation mode without requiring external assistance from a jig board, enabling the system to serve itself for mode switching operations.
2Adaptability or versatility
If a jig board is used to switch to evaluation mode, then the ONU can be switched to evaluation mode, but additional production costs are incurred
Solution Approach 1:
The ONU's memory and detection parts, originally designed for general operation, are made multi-functional by enabling them to store and detect evaluation mode activation instructions. This universal usage of existing components eliminates the need for separate jig board hardware, reducing production costs while maintaining the adaptability to switch to evaluation mode.
Solution Approach 2:
Instead of requiring a physical jig board, the invention uses digital copying of evaluation mode instructions into the ONU's memory. This digital representation replaces the physical hardware copy, significantly reducing production costs while preserving the full capability to switch to evaluation mode.
3Extent of automation
If the optical sending part is put into continuous light emission state upon memory rewrite detection, then evaluation mode is activated, but system influence may occur during normal operation if mistakenly rewritten
Solution Approach 1:
The detection part continuously monitors memory content and provides feedback to the control part. When a rewrite is detected, the system responds by switching to evaluation mode. This feedback mechanism automates the switching process while maintaining system reliability through controlled response to memory changes.
Solution Approach 2:
The system performs preliminary verification by detecting memory rewrite events before activating evaluation mode. This preliminary detection ensures that only intentional rewrites trigger the mode switch, preventing accidental activation during normal operation and maintaining system stability while preserving automated switching capability.
Data Source
AI summary
[Problem]This invention aims at solving the problem of how a subscriber premises-side optical network unit can be switched to an evaluation mode without the use of a jig board.[Means for Solving the Problem]The invention refers to a subscriber premises-side optical network unit (ONU 10) which is connected to a center-side optical network unit (OLT 1a) via an optical transmission line (optical fiber 2, 4) and to an external device (switch 6) via an electric signal line (electric signal line 5); comprising a memory (memory switch 15a) the stored content of which can be directly or indirectly rewritten by the external device; a detection part (CPU 15) for detecting that the content of the memory has been rewritten; and a control part (CPU 15) for performing, when the detection part detects that the stored content of the memory has been rewritten, a control whereby the optical sending part which sends optical signals to the optical transmission line is put into a continuous light emission state.