The 8-position, 8-contact (8P8C) RJ45 connector is ubiquitous in data networks worldwide. While global travelers may find themselves carrying multiple power adapters to ensure they can plug into a particular country's electrical grid, the RJ45 port on these travelers' laptop computers are universally accepted everywhere. Yet despite being a globally recognized and accepted interface, RJ45 jacks have two distinct wiring schemes when used in corporate data networks: T568A and T568B.
Recently the datacom-cabling distributor CableOrganizers posted an article on its website that explains the differences between the A and B wiring methods for RJ45 jacks. In additon to explaining and illustrating the differences between the wiring layouts, the article has advice for datacom installers who are considering which to use.
The illustrations below are taken from that Cableorganizer article.
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