Shielded twisted-pair cable (STP) combines shielding, cancellation, twisting of wires
STP reduces electrical noise; causes Crosstalk,
electromagnetic interference (EMI),
radio frequency interference (RFI).
STP affords greater protection from all types of external interference
Disadvantages: more expensive, difficult to install than UTP
A new hybrid of UTP with traditional STP is Screened UTP (ScTP), also known as Foil Twisted Pair (FTP).
The metallic shielding materials in STP and ScTP need to be grounded at both ends. If improperly grounded or if there are any discontinuities: STP and ScTP can become susceptible to major noise problems.
Unshielded twisted-pair cable (UTP)
4 pairs of wires
Each wire covered by insulating material.
Each pair of wires is twisted around each other.
Number of Twists limits signal degradation caused by EMI and RFI.
2 cables for each outlet
one for voice
one for data
It is easy to install
less expensive than other types of networking media.
However, the real advantage is the size of the cable
prone to electrical noise and interference
shorter runs than coaxial and fiber optic cables
view my complete comparison and you be the judge... ciao.