Redundant Ring Transmission with Bypass Packet Filtering
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Solution Overview
Problem
Conventional transmission systems in trains suffer from network disconnection and congestion due to failed transmission repeaters, which allow packets to flow into the network, causing communication errors and congestion.
Innovation Solution
A transmission apparatus with a redundant ring-shaped network design, incorporating a first and second transmission unit, a bypass control unit, and a packet control unit to manage packet output and bypasses during power-off failures, ensuring continuous communication by discarding unnecessary packets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a failed transmission repeater allows passage of all packets in the trunk transmission path, then network redundancy is improved, but network congestion and communication errors occur due to packets addressed to connected devices flowing through the network
Solution Approach 1:
The transmission apparatus applies local quality by differentiating packet handling based on destination address. The packet control unit examines the destination address of each packet and applies different transmission decisions: packets destined for the failed device are discarded locally, while packets for other devices continue through the bypass path. This localized differentiation resolves the contradiction by preventing harmful packets from causing congestion while maintaining the beneficial redundancy.
Solution Approach 2:
The packet control unit acts as an intermediary between the bypass control unit and the network. It receives packets from the bypass path, determines their appropriate handling based on destination addresses, and selectively forwards or discards them. This intermediary function enables the system to maintain redundancy benefits while filtering out packets that would cause congestion, thus resolving the technical contradiction.
2Device complexity
If a single transmission line is used for network control, then device complexity is reduced, but network disconnection occurs at any single point failure
Solution Approach 1:
The transmission system is segmented into multiple independent transmission paths: a primary transmission path and a bypass path with multiple transmission repeaters. This segmentation allows the system to maintain simplicity in each individual path while achieving high reliability through the bypass mechanism. When a failure occurs, only the affected segment is disrupted, and the bypass path provides alternative routing.
Solution Approach 2:
The bypass path with multiple transmission repeaters is prepared in advance as a cushion against failures. Before any failure occurs, the system is configured so that if a transmission repeater fails, the bypass path is already in place to provide alternative routing. This beforehand cushioning ensures continuous network operation without requiring complex real-time reconfiguration, thus maintaining simplicity while improving reliability.
Data Source
AI summary
A transmission apparatus includes: a first transmission unit having a first port and a second port, the first transmission unit determines whether a packet acquired from one of the ports is output from the other port or output to a connected device; a second transmission unit having a third port and a fourth port, the second transmission unit determines whether a packet acquired from one of the ports is output from the other port or output to the connected device; a bypass control unit provides bypasses between the ports of the first transmission unit and between the ports of the second transmission unit when power-off failures occur in the first and second transmission units; and a packet control unit that controls output of packets acquired by the first and second transmission units when the bypass control is performed in an adjacently connected transmission apparatus.