This story about a new Thunderbolt 3 dock from Promise Technology shows one of the two USB 3.0 ports labeled “USB 3.0 BC1.2”.

diagram of ports available on the Thunderbolt™ 3 Dock TD-300

Some searches show results for "BC 1.2 port" but I've not yet seen a definition or explanation.

  • Klanomath's answer is correct, but I just wanted to add: A few times I have seen the label "BC 1.0/2.0" or "BC 1.0-2.0". In those cases it meant "backwards compatible with USB 1.0 and USB 2.0". (Which sort of makes sense as there are some USB 3.0 ports that are NOT backwards compatible.) – Tonny Nov 20 '17 at 15:18

Battery Charging spec

BC 1.2 is an abbreviation for (USB) Battery Charging (revision) 1.2. I'm no USB specs specialist so I can link some abstracts/files only:

Basically it's a USB 3.0 port with some extra features to detect devices that can make use of charge currents beyond the standard 900mA.

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