Arduino Ethernet W5100 – how to fix the wrong board

Original : https://reedpaper.wordpress.com/2018/09/17/arduino-ethernet-w5100-how-to-fix-the-wrong-board/

I continue to talk about cases of flaws in China-made modules and ways to fix them. This time we are talking about the clone of the Arduino Ethernet Shield W5100.

Many users of such clones (Fig. 1) encountered an annoying problem: when connecting to some routers or using a long network cable, this shield can not establish a connection with the router or the communication is unstable, with large packet losses. Meanwhile, with another router model the same clone can work stably.