Optical Line Terminal Board Module Detection Circuit
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Solution Overview
Problem
Existing optical line terminals rely on in-position pins for detecting optical modules, which limits miniaturization and increases the number of pins required, leading to slower detection responses when using software-based methods.
Innovation Solution
A board for the optical line terminal incorporating a level adjustment circuit and a detection apparatus that sends reset signals at regular intervals, allowing the detection of optical module insertion or absence without the need for in-position pins by monitoring signal levels over preset durations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an in-position pin is used to detect optical module insertion, then the detection reliability is improved, but the number of pins increases and miniaturization is hindered
Solution Approach 1:
The patent extracts the detection function from the mechanical in-position pin structure and implements it through electrical signal detection using existing detection pins. The detection apparatus monitors signal levels on detection pins to determine optical module insertion status, eliminating the need for dedicated in-position pins while maintaining reliable detection capability.
Solution Approach 2:
The detection pins serve multiple functions: they are used for both optical signal detection and insertion status detection. By making the detection pins multi-functional, the patent reduces the total number of pins required while maintaining the ability to reliably detect whether an optical module is inserted.
2Device complexity
If software-based detection is used to detect optical module insertion, then the device complexity is reduced, but the response speed decreases
Solution Approach 1:
The patent replaces software-based detection with a hardware-based detection apparatus that directly monitors electrical signal levels on detection pins. This hardware implementation provides faster response speed compared to software polling, while the overall system complexity remains manageable through dedicated detection circuitry.
Solution Approach 2:
The detection apparatus automatically and continuously monitors the signal levels on detection pins without requiring external software intervention or polling. The system self-services by maintaining constant monitoring of insertion status, providing immediate detection responses when optical modules are inserted or removed.
3Volume of moving object
If the optical module is miniaturized, then the package size is reduced, but the dependency on in-position pins increases
Solution Approach 1:
The patent merges the insertion detection function with the existing optical signal detection function by using the same detection pins for both purposes. This consolidation allows miniaturization of the optical module without adding dedicated in-position pins, as the existing detection infrastructure serves dual functions.
Data Source
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AI summary
This application discloses a board of an optical line terminal and the optical line terminal, and relates to the field of optical communications. The board of the optical line terminal includes a level adjustment circuit, a detection apparatus, and a control apparatus. The detection apparatus is configured to: when the detection apparatus is connected to an optical module, receive an indication signal output by an upstream optical signal detection pin; and is further configured to continuously detect a received first level signal and the received indication signal. If there is a second level signal, opposite to the first level signal, in a signal received within preset duration, the detection apparatus notifies the control apparatus that the optical module is inserted. If there is no second level signal in the signal received within the preset duration, the detection apparatus notifies the control apparatus that the optical module is absent. The preset duration is greater than a first preset period. The detection apparatus in this application implements a function of an in-position pin of the optical module. This makes the optical module less dependent on the in-position pin, and decreases a quantity of pins of the optical module.