Solid-State Ethernet Bypass Switching Without External Power
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Solution Overview
Problem
Ethernet by-pass switches face challenges in providing a rugged, high-reliable mechanism to maintain network connectivity, especially in harsh environments where traditional electro-mechanical solutions fail due to shock and vibration, and require external power for operation.
Innovation Solution
A solid-state Ethernet by-pass switch using Field Effect Transistors (FETs) that derives operational power from Ethernet signals, allowing automatic switching to a by-pass state when power is lost or a control signal is not asserted, ensuring network connectivity without external power sources and tolerating high shock and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional electro-mechanical switches are used, then switching function is achieved, but reliability deteriorates due to shock and vibration in harsh environments
Solution Approach 1:
The patent replaces electro-mechanical relay switches with solid-state Field Effect Transistor (FET) switching devices. This substitution eliminates moving parts and mechanical contacts that are vulnerable to shock and vibration, providing a rugged solution that maintains reliable switching function in harsh environments while achieving the desired improvement in reliability.
2Ease of operation
If external power sources are used for the switch, then switching operation is enabled, but device complexity increases
Solution Approach 1:
The patent implements a self-powered switching mechanism where the FET switching circuitry derives its operational power directly from the Ethernet signal lines themselves. The circuit uses the differential voltage present on the Ethernet transmit and receive pairs to bias and operate the FETs, eliminating the need for separate external power sources or complex power supply circuits. This self-service approach simplifies the overall device while maintaining full switching functionality.
3Reliability
If the switch requires host device power, then switching control is available, but operational continuity deteriorates when host device is powered down
Solution Approach 1:
The self-powered design allows the Ethernet by-pass switch to remain operational independently of host device power state. By harvesting power from the Ethernet signal lines themselves, the switch can detect signal presence and maintain switching functionality even when connected devices are powered down or in sleep mode, ensuring continuous network connectivity and improving operational duration without requiring host device power.
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
The solid-state Ethernet by-pass switch provides reliable electrical connectivity and maintains network communication in harsh environments by automatically switching to a by-pass state without external power, ensuring continuous operation and tolerance to mechanical stress.
Implementation Method 1
A solid-state Ethernet by-pass switch using Field Effect Transistors (FETs) that derives operational power from Ethernet signals
Data Source
AI summary
A solid-state Ethernet by-pass switch includes a first connection that accepts transmit and receive lines from a first Ethernet device, a second connection that accepts transmit and receive lines from a second Ethernet device, a third connection that accepts transmit and receive lines from a third Ethernet device and a solid-state switching device having a normal state and a by-pass state. When configured in the normal state, the solid-state switching device couples the transmit and receive lines from the first connection to the transmit and receive lines from the second connection. When configured in the by-pass state, the solid-state switching device couples the transmit and receive lines from the first connection to the transmit and receive lines from the third connection.