Okay, so when searching for information on telephone jacks, I learned some interesting things to take note of.
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“Registered jacks” are very specific to the implementation of an installed jack use.
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RJ45 is technically an incorrect label for Ethernet jacks because Ethernet jacks are unkeyed 8P8C connectors.
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If you care mainly about the mechanical and electrical specifications of the plug, then the 6P6C, 6P4C, 6P2C, etc. names are the correct ones to be searching for. Nevertheless, given the frequent incorrect usage that has emerged in relation to Ethernet connectors, you might as well also try searching for the RJ jack colloquialisms.
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PBX = Private Branch Exchange, which refers to a telephone switching system installed in a business. Nowadays with VoIP, a PBX is easy for anyone to setup.
20181209/https://en.wikipedia.org/wiki/Registered_jack
20181209/https://en.wikipedia.org/wiki/Business_telephone_system
20181209/https://en.wikipedia.org/wiki/Modular_connector