Adresa stranky s vlastnostami metal. vedeni:

http://www.trendcomms.com/multimedia/training/broadband%20networks/web/main/Copper/CoverCopper.html

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opis pristroja Visi Shark:
http://documents.exfo.com/specsheets/CableSHARKP3-ang.pdf
http://www.trinstruments.cz/produkty/telekomunikacni/testery-pristupovych-siti/testery-xdsl/cableshark-p3.html

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