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RJ45, part of the Registered Jack family of connectors designed by government-mandated telephone monopoly AT&T and codified in 47CFR-68 by the FCC, is free of bureaucratic regulation?

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It has nothing to do with who invented the connector. The question is why it is dominantly used without being forced upon the users by regulations.

But it was mandated by the government https://en.wikipedia.org/wiki/Registered_jack

Telephones and other telecommunication devices have been mandated to use RJ connectors for decades!

It's dominantly used because it was forced by regulations.

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