Unidirectional Communication Links with Diode-Isolated Error Feedback
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Solution Overview
Problem
Existing physical unidirectional data transfer technologies face reliability issues due to structural limitations, particularly in detecting and addressing data reception failures or errors on the receiving side, leading to potential data loss and security vulnerabilities.
Innovation Solution
A physical unidirectional communication apparatus and method that utilize a separate data reception status transmission line to convey electrical ON/OFF signals, enabling the detection of errors and facilitating retransmission of data, while preventing reverse data transmission through the use of diodes and deactivating the auto-MDIX function to ensure unidirectional data flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the RX line is eliminated to ensure physical unidirectionality, then security is improved, but data transmission reliability deteriorates
Solution Approach 1:
The patent segments the communication system into two independent parts: a unidirectional data transmission line for secure data flow from internal to external network, and a separate bidirectional status transmission line for error feedback. This segmentation allows each line to serve its specific function without compromising the other, resolving the contradiction between security and reliability.
Solution Approach 2:
The patent introduces a status transmission line as an intermediary mechanism that carries error information from the external network back to the internal network. This intermediary allows the internal network to detect and respond to transmission errors without creating a bidirectional data path, thus maintaining security while improving reliability.
2Productivity
If buffer size and transfer rate are adjusted to compensate for data loss, then data transmission continuity is improved, but the system complexity increases
Solution Approach 1:
The patent implements a feedback mechanism through the status transmission line that carries error information from the external network to the internal network. This feedback allows the internal network to detect transmission errors and request retransmission, improving data transmission continuity without requiring complex buffer management or rate adjustment algorithms.
3Reliability
If a separate control line is used to transmit status information, then error detection capability is improved, but the risk of misuse as intrusion path increases
Solution Approach 1:
The patent applies local quality by designing the status transmission line with specialized characteristics: it uses electrical ON/OFF signals instead of data packets, and the internal network treats this line as read-only for error detection purposes. This localized differentiation ensures the line can carry status information without creating a bidirectional data path that could be misused for intrusion.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enhances the reliability of data transmission by allowing error detection and retransmission, thereby reducing data loss and security risks, while maintaining physical unidirectionality and preventing potential misuse of control lines as intrusion paths.
Implementation Method 1
utilizing a structure that exploits an electrical signal by which data cannot be transmitted
Data Source
AI summary
A physical unidirectional communication apparatus and method intended to utilize a structure that exploits an electrical signal by which data cannot be transmitted and to guarantee the reliability of data transmission via a transmission method that uses the structure. The physical unidirectional communication apparatus includes a unidirectional data transmission line, a data reception status transmission line, an internal network connection system unit for performing communication with an internal network transmission host and transmitting transmission data to an external network connection system unit through the unidirectional data transmission line, and the external network connection system unit for performing communication with an external network reception host, receiving the transmission data from the internal network connection system unit, generating reception status information of the transmission data, and transmitting the reception status information to the internal network connection system unit through the data reception status transmission line.