Transmission System Jitter Reduction via Waiting Time Information
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Solution Overview
Problem
Existing transmission systems experience jitter due to the insertion of OAM frames between client data packets, especially when there is no blank time available for insertion.
Innovation Solution
A transmission system comprising a transmitting apparatus and a receiving apparatus, where the transmitting apparatus waits to output second client data until it completes transmitting a management frame and waiting time information, and the receiving apparatus adjusts its output timing based on the waiting time information to ensure a shorter interval between client data packets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If OAM frames are inserted between client data packets for management purposes, then management functionality is improved, but frame jitter increases due to blank periods and delays
Solution Approach 1:
The transmitting apparatus performs preliminary actions by measuring the blank time between packets before inserting OAM frames, and by calculating and transmitting waiting time information in advance. This allows the receiving apparatus to pre-calculate output timing, preventing jitter rather than correcting it afterward.
Solution Approach 2:
The system implements feedback by transmitting waiting time information from the transmitting apparatus to the receiving apparatus. The receiving apparatus uses this feedback to adjust its output timing dynamically, ensuring that the interval between output packets is shorter than the data reception interval, thereby eliminating jitter.
2Productivity
If OAM frames are inserted into blank time periods, then transmission continuity is maintained, but frame timing accuracy deteriorates due to variable delays
Solution Approach 1:
The transmitting apparatus provides feedback by transmitting waiting time information that enables the receiving apparatus to calculate precise output timing. This feedback mechanism allows the receiving apparatus to compensate for the variable delays introduced by OAM frame insertion, maintaining both transmission continuity and timing accuracy.
Solution Approach 2:
The system performs preliminary measurement of blank time and preliminary calculation of waiting time information before OAM frame insertion. This advance preparation allows the receiving apparatus to determine the exact output timing in advance, ensuring timing accuracy is maintained despite OAM frame insertion.
3Manufacturing precision
If waiting time information is transmitted to adjust output timing, then frame jitter is reduced, but system complexity increases
Solution Approach 1:
The patent introduces waiting time information as an intermediary element that mediates between the transmitting and receiving apparatuses. This intermediary carries the necessary timing adjustment data without requiring complex control mechanisms, buffers, or real-time negotiations, thereby reducing system complexity while improving timing precision.
Data Source
AI summary
A transmitting apparatus transmits a management frame and a waiting time information after transmitting a first client data output from a first buffer to a receiving apparatus. A first control unit waits for second client data to be output from the first buffer until the transmitting apparatus completes transmission of the management frame and the waiting time information. A second control unit, based on the waiting time information, determines an output start timing at which output of the second client data from the second buffer. The output start timing is a timing at which a time shorter than a data reception interval elapses from completion of output of the first client data from the second buffer. The reception interval is a time from completion of reception of the first client data by the receiving apparatus to start of reception of the second client data by the receiving apparatus.