Copper UTP and STP Copper Cables This lesson discusses UTP and STP copper cables. Copper cables are subject to electromagnetic interference (EMI). UTP stands for Untwisted Pair and STP stands for Shielded Twisted Pair. These pairs are cable stands made of smaller individual cabling twisted together. The twists help to cancel out EMI. Shielded pairs also have a braided metal shield on top of the cables, which offers greater protection against EMI. The lesson goes on to discuss the following unshielded twisted pair types:
  • CAT 3
  • CAT 5
  • CAT 5e
  • CAT 6:
  • CAT6a
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