Apr 26, 2012

Reflection #5

This week, the topic that has been focused is about cabling. What is cabling? We'll see the meaning and types of cabling for internet with further reading. 


Cable is the medium through which information usually moves from one device to another.

There are five types of cables that we will go through:

1. Unshielded Twisted Pair (UTP) Cable
2. Shielded Twisted Pair (STP) Cable
3. Coaxial Cable
4. Fiber Optic Cable
5. Wireless LANs

The different types of cables are divided into two categories, the guided and unguided.

Unshielded Twisted Pair (UTP) Cable

  • Has four pairs of wires inside.
  • Each pair is twisted with different numbers of twists per inch.
  • The advantage of twists: to help eliminate noise from adjacent pairs and other electrical device.
Shielded Twisted Pair (STP) Cable

  • Consist of two individual wires wrapped in a foil shielding.
  • The cable is quite bulky.
  • Usually used for Token Ring topology.

Coaxial Cable

  • Has a single copper conductor at its center.
  • Insulation of plastic layer between the center conductor and a braided metal shield.
  • Function of metal shield: block any outside interference: 
    • Fluorescent light
    • Motors
    • Other computers

Fiber Optic Cable

  • A center glass core is surrounded by several layers of protective materials.
  • Transmit signals over much longer distance.
  • Move in a form of light.
  • Capable of eliminating the problem of electrical interference.

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