Shielded Twisted Pair Wiring (STP)

• We have been talking about unshielded twisted pair wiring.

• Is there a shielded twisted pair wiring?

  • Yes. It has a metal mesh shield around each pair to reduce cross-talk interference
  • It also has a metal mesh shield around the four pairs to reduce external EMI
  • It is no longer used extensively because UTP, which is much less expensive, was found to begood enough for normal environments
  • However, we will see that Cat 7 wiring uses STP

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