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Table Of Contents  CertiGuide to Network+
 9  Chapter 0001:  LAN Cabling
      9  V  Twisted Pair Technologies

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Twisted Pair Background
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 Twisted Pair Cable Naming Conventions
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Major Types of Twisted Pair Cable

Twisted pair cable is available in two primary varieties: Shielded Twisted Pair (STP) and Unshielded Twisted Pair (UTP). The difference between the two varieties is the degree of shielding against outside interference that is provided by the covering over the wires. Unshielded does not contain any special shielding, whereas Shielded does.

Figure 13: Unshielded Twisted Pair

 

UTP (Unshielded Twisted pair) cable is usually 4 pair, or 8 wires. The outer covering of the wires may be PVC or in more expensive cable, a plenum outer jacket.

Plenum

Plenum is typically required by fire code when cable is run in enclosed areas such as walls or ceilings. This type of material does not produce poisonous fumes in a fire.


STP (Shielded twisted pair) is just like its cousin, however it has a metal layer before the outer jacket. IBM Token Ring networks typically require this type of cable.

Figure 14: Shielded Twisted Pair

 

A media filter can be used to make a Token Ring network, ‘talk’ using UTP. The media filter removes the noise induced by the lack of a metal shield.

Media Filter

A device called a media filter is used to make CAT cable usable for IBM Token Ring networks. This device makes up for the lack of shielding on CAT (UTP) cable.



Previous Topic/Section
Twisted Pair Background
Previous Page
Pages in Current Topic/Section
1
Next Page
 Twisted Pair Cable Naming Conventions
Next Topic/Section

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