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Is shielded cabling required for “lightning protection” to work on ethernet couplers?

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Does this type of lightning/surge protection on ethernet couplers depend on a connection to ground through the shielding of the connected ethernet cables? Considering UTP (unshielded twisted pair) is used in most places, this would be useful to know before deciding on what type of coupler to get.

How does TVS (transient voltage suppression diodes?) protection work, and is it worth it?