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Sorry, the CAT5 spec doesn't specify it should be shielded, so mostly it is NOT shielded (we do cabling, that's why I know). UTP is UNSHIELDED twited pair, STP is SHIELDED twisted pair, you have both meeting CAT5 specifications.
People use them for 'such applications' because they are cheap and can be found everywhere. The twisting of the pairs keeps noise out, only for BALANCED signals, so not at all for most applications.
Joa
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