Traffic Shaping Between DMT Processor and Data Link Layer
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Solution Overview
Problem
The existing line card systems experience burstiness in data traffic between DMT processing modules and data link layer processors, leading to inefficient use of buffer space and quality of service issues, as data is transmitted in bursts rather than being spread out over time, causing congestion and increased bandwidth usage.
Innovation Solution
The proposed solution involves transmitting data related to a single symbol in multiple spaced-out data portions over a longer time period, allowing for interleaved transmission and reducing the effective burstiness of traffic without increasing memory requirements, and using timing mechanisms within DMT processing modules to control the transmission based on symbol properties, such as size, to minimize idle data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If data is transmitted in bursts from DMT processing modules to data link layer processor, then transmission speed is improved, but buffer space requirements increase and quality of service deteriorates
Solution Approach 1:
The patent segments the data transmission process by dividing data related to a single symbol into multiple data portions that are transmitted at different times. This segmentation transforms the bursty transmission pattern into a more distributed pattern, reducing the peak buffer space requirements while maintaining transmission speed. The data portions are spaced apart in time, preventing simultaneous arrival of all data and thus reducing buffer pressure.
2Productivity
If data is transmitted in bursts, then transmission efficiency is improved, but traffic congestion increases and quality of service deteriorates
Solution Approach 1:
The patent implements periodic action by transmitting data portions at regular time intervals rather than in continuous bursts. The data portions related to a single symbol are transmitted periodically spaced apart in time, which smooths out the traffic pattern. This periodic transmission approach maintains transmission efficiency while preventing traffic congestion by distributing the data flow over time rather than concentrating it in bursts.
3Reliability
If buffer size is increased to handle burst traffic, then data loss is reduced, but device complexity and cost increase
Solution Approach 1:
The patent applies preliminary action by pre-dividing the data into multiple portions and scheduling their transmission at different times before the actual data processing occurs. This preliminary organization of data transmission timing allows the system to handle burst traffic without requiring oversized buffers. The data is prepared and staged in advance according to a time-spread schedule, preventing buffer overflow while maintaining reliability.
Data Source
AI summary
A line card is proposed in which one or more DMT processing modules 1 communicate with a data link layer platform, such as an ATM, POSPHY or Ethernet processor. The data relating to a single symbol is transmitted between the data link layer platform and a given one of DMT processing modules in a plurality of data portions spaced apart in time. The data portions relating to different channels of a given DMT processing module (or to different DMT processing modules) are interleaved in time. Since the data portions of a given symbol are spaced apart in time, the data relating to a single symbol is transmitted over a longer time period than in conventional devices which reduces the effective burstiness of the traffic, and thus reduces the memory requirements of the data link layer platform.