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

But it was mandated by the government https://en.wikipedia.org/wiki/Registered_jack https://en.wikipedia.org/wiki/Registered_jack Telephones and other telecommunication devices have been mandated to use RJ connectors for decades!