4.2 Shielded Twisted Pair (STP) Cable
Although UTP cable is
the least expensive cable, it may be susceptible to radio and electrical
frequency interference (it should not be too close to electric motors,
fluorescent lights, etc.). If you must place cable in environments with lots of
potential interference, or if you must place cable in extremely sensitive
environments that may be susceptible to the electrical current in the UTP,
shielded twisted pair may be the solution. Shielded cables can also help to
extend the maximum distance of the cables.
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| Shielded twisted pair |
Shielded twisted pair cable is available in three different configurations:
1.
Each pair of wires is
individually shielded with foil.
2.
There is a foil or braid
shield inside the jacket covering all wires (as a group).
3.
There is a shield around
each individual pair, as well as around the entire group of wires (referred to
as double shield twisted pair).
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