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Shielded Twisted-Pair cable
Combines the techniques of
shielding, cancellation, and twisting of wires . Each pair of wires is wrapped
in metallic foil. The 4 pairs of wires are wrapped in an overall metallic braid
or foil. It is usually 150 Ohm cable. As specified for use in Ethernet network
installations, STP reduces electrical noise, both within the cable (pair to
pair coupling, or crosstalk) and from outside the cable (electromagnetic
interference -- EMI -- and radio frequency interference --
RFI).
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