Double-Ring Network Logical Address Assignment for Transmission Priority
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Solution Overview
Problem
In token-ring network systems, the variation in synchronous time due to differing node number assignments leads to delayed accumulation and increased transmission time, especially when new or changed transmission stations are added, burdening operators with determining optimal transmission priorities.
Innovation Solution
A double-ring network system where a master station assigns logical addresses based on connection order, using a frame detection determining circuit and address list setting circuit to manage transmission priorities, allowing each station to transmit frames according to its priority, reducing the need for extensive scanning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If node numbers are assigned in order of transmission priority, then transmission time is optimized, but operator burden increases when adding or changing transmission stations
Solution Approach 1:
The system enables automatic assignment of node numbers based on connection order without requiring operator intervention. The master station automatically manages node number allocation and updates the address list when new transmission stations are added or existing stations are changed, eliminating the need for operators to manually determine optimal transmission priorities.
Solution Approach 2:
The system pre-assigns node numbers in the address list based on connection order before transmission occurs. By establishing the node number assignment in advance according to connection sequence, the system ensures optimal transmission time is achieved automatically without requiring real-time operator decisions.
2Reliability
If master station scans all 256 nodes using SYN frames, then all transmission stations can transmit REQ frames, but the process takes a great deal of time
Solution Approach 1:
The system extracts and utilizes the node number information already present in the address list to directly determine which transmission stations are permitted to transmit REQ frames. Instead of scanning all 256 nodes, the master station refers to the pre-established address list to identify valid transmitting nodes, significantly reducing the time required while maintaining transmission reliability.
3Device complexity
If node numbers are not assigned in order of transmission priority, then network configuration is simpler, but delayed accumulation occurs and transmission time increases
Solution Approach 1:
The system pre-assigns node numbers in the address list based on connection order before transmission operations begin. This preliminary assignment ensures that transmission priorities are optimized without requiring complex manual configuration, as the node numbers are automatically set according to the sequence in which stations connected to the network.
Data Source
AI summary
According to one embodiment, in a double-ring network, a master station includes a transmitting and receiving permission switch portion, a communication port A at an A-system side, a communication port B at a B-system side, a first receiving control circuit portion, a transmitting and receiving control circuit portion, a frame detection determining circuit portion, a frame data generating circuit portion, a logical address determining circuit portion, a live list setting circuit portion and an address list setting circuit portion. The master station determines a token order (a transmission priority, also called a logical address) using a shortest path function by the logical address determining circuit portion and the address list setting circuit portion such that the token order does not depend on physical addresses of transmission stations and is matched to a connection order of transmission stations to realize path optimization. This reduces a transmission time.