OTN Frame Parameter Extraction for Clock Recovery
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Solution Overview
Problem
The recovery of clock or frequency for service data in Optical Transport Networks (OTN) requires significant hardware resources due to the use of low-pass phase-locked loops.
Innovation Solution
A method and apparatus that multiplex or map frames with specific parameters, allowing recovery of clock or frequency information without the need for low-pass phase-locked loops by using a first parameter representing the number of m-bit client data entities and a second parameter representing the difference between n-bit client data entities and \( m imes C_m \), with the first parameter placed in the frame's overhead part.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If low-pass phase-locked loop is used to recover clock or frequency of service data, then frequency recovery is achieved, but hardware resources are consumed excessively
Solution Approach 1:
The patent extracts the essential frequency recovery function from the complex low-pass phase-locked loop by using a simplified parameter-based approach. The first parameter (number of m-bit client data entities) and second parameter (difference between n-bit client data entities and m×Cm) are extracted from the frame structure to enable frequency recovery without requiring hardware-intensive phase-locked loop circuits at intermediate nodes.
Solution Approach 2:
The patent changes the approach from hardware-based frequency recovery to parameter-based frequency recovery. By encoding frequency information in the frame parameters (first parameter and second parameter) rather than using hardware circuits, the system achieves frequency recovery through software processing, significantly reducing hardware resource consumption.
2Reliability
If intermediate nodes use low-pass phase-locked loop for clock recovery, then clock synchronization is maintained, but hardware consumption increases
Solution Approach 1:
The patent removes the low-pass phase-locked loop hardware component from intermediate nodes by extracting the clock recovery function into the frame parameter structure. The first and second parameters carry the necessary information for clock synchronization, allowing intermediate nodes to maintain synchronization through parameter processing rather than hardware-based phase-locked loops.
Solution Approach 2:
The patent replaces the mechanical/electronic phase-locked loop system with an information-theoretic approach using frame parameters. Instead of using hardware circuits to synchronize clocks, the system uses the first parameter (number of m-bit client data entities) and second parameter (difference value) to convey synchronization information, substituting hardware mechanisms with information processing.
Data Source
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AI summary
Provided in the embodiments of the present disclosure are a transmission method and apparatus, and an optical communication device and a storage medium. The method comprises: a first device multiplexing or mapping a first frame to a second frame, and sending the second frame, wherein the second frame comprises a first parameter and does not comprise a second parameter, and the first parameter represents an m-bit customer data count; and the second parameter represents a difference between an n-bit customer data count and (m/n)*Cm.