Velleman STP8025 - Manual (Page 3)

Screened unshielded twisted pair (S/UTP)
Also known as Fully shielded (or Foiled) Twisted Pair (FTP), is a screened UTP cable
(ScTP).
Shielded twisted pair (STP or STP‐A)
STP cabling includes metal shielding over each individual pair of copper wires. This
type of shielding protects cable from external EMI (electromagnetic interferences).
e.g. the 150 ohm shielded twisted pair cables defined by the IBM Cabling System
specifications and used with token ring networks.
Screened shielded twisted pair (S/STP or S/FTP)
S/STP cabling, also known as Screened Fully shielded Twisted Pair (S/FTP),
[1]
is both
individually shielded (like STP cabling) and also has an outer metal shielding covering
the entire group of shielded copper pairs (like S/UTP). This type of cabling offers the
best protection from interference from external sources, and also eliminates alien
crosstalk.