What's the difference between cat 6a STP and cat 6 STP plug connector?
Can I use a cat 6 plug on a cat 6a wire?
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I was wondering this as well and felt I needed to track down the actual requirements.
Visually/design wise there is no difference. If you are using them in a non-certified setting feel free to use whatever you have on hand (6/6a).
Basically it just needs to be made with higher quality materials (if aiming for the bare minimum qualifications), but because of engineering tolerances and business reasons (you don't want to lose a whole batch because you cut things too close) they'll usually pass (This "usually" is an important distinction though if you needed to certify your network).
In contrast to Ron's statements: It is VERY LIKELY, but not guaranteed, that if you construct the cable correctly (and honestly it isn't rocket science, just finicky, on a cable by cable basis) using Cat 6a cabling and Cat 6 connectors it would certify as Cat 6a. That said, again if you need certification then it's probably just best to spend the extra money on Cat 6a parts.
Getting technical: (this information is all pulled directly from primary sources)
The ONLY additions are that Cat 6a connectors must pass these extensions of the same tests (This is for both shielded and unshielded connectors):