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How can I make a simple cheap 3 port Switch? I have 30 10-base low speed Ethernet devices and I want to connect them together, how can these devices connects together with simple Bus topology? simplest and cheap way?

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closed as too broad by pjc50, Matt Young, JYelton, Chetan Bhargava, Nick Alexeev May 2 '14 at 16:33

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The simplest and cheapest way is to go buy one. The off-the-shelf hardware is so inexpensive these days that there's really no way you're going to create a custom solution that saves either money or effort. Both Amazon and Newegg list several Ethernet switches for less than $20.

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