Intrinsically safe ethernet-based communication
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United States of America Patent
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Dec 20, 2011
Grant Date -
Nov 20, 2008
app pub date -
Oct 5, 2005
filing date -
Oct 5, 2005
priority date (Note) -
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Abstract
An intrinsically safe network switch (200) includes five electronically isolated ports, four for connections in hazardous areas (206-1, 206-2, 206-3, 206-4) and one for receiving an unsafe Ethernet input (204). The device may use 10/100 mbps Ethernet cables and connectors and provides speed and activity LED indicators for each port. The device may be din rail-mountable, wall mountable, or desk mountable, and includes an integral heat sink for cool operation. The device incorporates internal barriers and isolated circuitry to guarantee safety and high-integrity signals with resistance to ambient EMI/RFI radiation. This network switch (200) could be any Ethernet communication devices such as hub, managed or unmanaged switch etc. Also, it could have total 'n' number of ports (isolated or un-isolated) with 1 port for safe area and 'n-1' port of hazardous area. The number of ports for safe and hazardous area can be varied to meet specific application requirements.
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