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Why doesn't the Ethernet W5100 shield work on Gigabit switch?

I have an Arduino Uno with an Ethernet Shield based on the Wiznet W5100 chipset : It worked like a charm until I had to move it to another location and plugged it to a Gigabit switch. I had no link, ...
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2answers
6k views

Arduino 4G LTE Shield

Is there by any chance a shield that can take an 4G LTE compatible SIM card activated by a carrier and establish a connection?
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1answer
645 views

Why can't I connect more than one Arduino Uno + Ethernet Shield to my network?

I'm using 3 Arduino Uno boards with Ethernet shields. Each is connected to my home Internet switch with an Ethernet cable. I assigned a different local IP address to each Arduino and gave each board ...