Client Signal Mapping Circuit Jitter Suppression
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Solution Overview
Problem
Conventional OTN systems face compatibility issues and difficulty in suppressing destuff jitter, particularly when accommodating client signals with strict jitter regulations, due to limitations in existing clock frequency restrictions and stuff processing methods.
Innovation Solution
A client signal mapping circuit and method that includes a buffer unit, stuff processing determination unit, and overhead insertion unit, utilizing pseudo random sequence modulation to determine and insert stuff bytes based on buffer usage, thereby controlling jitter and maintaining compatibility with G.709 standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional clock frequency restrictions are applied to suppress destuff jitter, then jitter suppression is improved, but compatibility with existing apparatuses operating in ±20 ppm or ±100 ppm ranges is lost
Solution Approach 1:
The invention changes the parameter of stuff insertion from fixed periodic insertion to variable insertion based on buffer level thresholds. The stuff insertion amount is dynamically adjusted according to the buffer used amount, allowing the system to adapt to different operating conditions while maintaining compatibility with existing apparatuses. This resolves the contradiction by making the jitter suppression mechanism flexible rather than relying on fixed clock frequency restrictions.
Solution Approach 2:
The invention implements a feedback mechanism where the buffer used amount is continuously monitored and used to control the stuff insertion amount. The stuff processing determination unit determines the stuff insertion amount based on the buffer used amount reported by the monitoring unit, creating a closed-loop control system that suppresses jitter while maintaining compatibility with existing apparatuses operating in standard frequency ranges.
2Adaptability or versatility
If stuff bytes are inserted with extremely long cycles to accommodate frequency deviation, then frequency deviation absorption is improved, but low-frequency destuff jitter occurs that cannot be suppressed by PLL
Solution Approach 1:
The invention applies periodic action by inserting stuff bytes at regular intervals determined by buffer threshold levels rather than extremely long cycles. The buffer used amount monitoring triggers stuff insertion when thresholds are met, creating a more frequent and regular insertion pattern that prevents low-frequency destuff jitter while still accommodating frequency deviation. This resolves the contradiction by making the insertion periodic and predictable rather than sparse and irregular.
Solution Approach 2:
The invention makes the stuff insertion dynamic by adjusting the insertion amount based on real-time buffer level conditions. The stuff processing determination unit dynamically determines how many stuff bytes to insert based on the current buffer used amount, allowing the system to respond to changing frequency deviation conditions while maintaining regular insertion patterns that prevent low-frequency jitter.
3Adaptability or versatility
If fixed stuff processing methods are used to maintain compatibility with G.709 standards, then standard compatibility is improved, but ability to suppress destuff jitter in strict jitter regulation scenarios is insufficient
Solution Approach 1:
The invention makes the stuff processing dynamic and adaptive while maintaining G.709 compliance. The stuff processing determination unit dynamically determines the stuff insertion amount based on buffer levels, allowing the system to adjust its behavior to suppress jitter in strict regulation scenarios while still operating within the G.709 framework. This resolves the contradiction by making the processing flexible rather than fixed.
Solution Approach 2:
The invention changes the parameter of stuff insertion from fixed to variable based on buffer conditions. By monitoring the buffer used amount and adjusting the stuff insertion amount accordingly, the system can adapt its processing to suppress jitter while maintaining compatibility with G.709 standards. The variable insertion amount allows optimization for strict jitter regulation scenarios while preserving standard compatibility.
Data Source
AI summary
A client signal mapping circuit for accommodating a client signal in a transmission frame, including: a buffer unit configured to temporarily store the client signal; a buffer used amount monitoring unit configured to report a used amount of the buffer unit; a stuff processing determination unit configured to compare the used amount of the buffer unit with a predetermined reference value, and a pseudo random sequence signal and the comparison result; an overhead insertion unit configured to add an overhead to the client signal read from the buffer unit to form a transmission frame; and a reading control unit configured to perform control for reading the client signal from the buffer unit based on determination by the stuff processing determination unit.