Passive Ethernet Bypass Relay for Power-Off Node Failover
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Solution Overview
Problem
Existing Ethernet network configurations, particularly in daisy chain topologies, face issues with communication disruptions and slow transfer speeds when nodes fail, as they require separate cables and mechanical relays that are slow and power-dependent.
Innovation Solution
A passive Ethernet by-pass switch utilizing depletion mode transistors to bridge Ethernet ports without power, allowing continuous network communication even when nodes fail, and incorporating a watchdog circuit and power monitoring system to manage power distribution based on heartbeat signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical relays are used to bridge failed nodes, then network communication can be restored, but the switching speed is slow and power is required
Solution Approach 1:
The patent replaces mechanical relays with solid-state transistor-based switching circuitry. Specifically, depletion mode transistors are used to create electronic switches that can bridge failed nodes without mechanical moving parts, thereby achieving faster switching speeds while maintaining the ability to restore network communication upon node failure.
Solution Approach 2:
The patent implements fail-safe functionality that automatically activates when a node fails, without requiring external power or control signals. The depletion mode transistors are configured to automatically bridge the Ethernet ports when power is removed or a failure condition is detected, enabling self-activating failover behavior.
2Reliability
If managed switches and separate cables are used to maintain communication during node failure, then network availability is improved, but device complexity and cabling requirements increase
Solution Approach 1:
The patent combines the fail-safe bridging functionality directly into the Ethernet switch device itself, eliminating the need for separate mechanical relays and additional cabling. The switching circuitry integrates the failover capability within the existing Ethernet port infrastructure, simplifying the overall system architecture while maintaining network availability.
Solution Approach 2:
The patent makes the Ethernet switch capable of multiple functions: normal network switching operation and automatic fail-safe bridging. The same Ethernet ports and switching circuitry serve both standard network communication and failover purposes, eliminating the need for dedicated failover hardware or separate cable paths.
3Use of energy by moving object
If depletion mode transistors are used to bridge connections without power, then passive fail-safe operation is achieved, but power management control becomes necessary
Solution Approach 1:
The depletion mode transistors are configured to automatically transition between conducting and non-conducting states based on the presence or absence of power, without requiring external control signals. This self-activating behavior eliminates the need for complex power management control circuits while achieving passive fail-safe operation.
Data Source
AI summary
Passive Ethernet by-pass switches, methods of using the same, and systems including the passive Ethernet by-pass switches include a first connection configured to be coupled to a first Ethernet port, a second connection configured to be coupled to a second Ethernet port, and switching circuitry including at least one internal switch operable to allow network communication between the first connection, the second connection, and at least one Ethernet controller, the at least one internal switch including a depletion mode transistor operable to bridge the first connection to the second connection to establish communication between the first connection and the second connection.