Transmission Media - (4)

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Transmission Media - 4



Summary on What we have studied on last tutorial ? :-

  • Twisted pair cables are cable of wires twisted around each other forms a twisted pair cable to reduce crosstalk. A number of twisted pair wires are placed inside a protective sheath to form a cable.
  • A pair of unshielded wires wound around each other is known as an UTP. An UTP is a pair of copper wires wound by plastic insulators. UTP is cheapest form of cables available for networking purposes.
  • Electronic Industries Association ( EIA), Telecommunications Industries Association ( TIA) and American National Standards Institute ( ANSI ) are the organisation which have defined standards for UTP cabling.
  • CAT 5 defines a cable that can carry data upto 100Mbps. The signalling frequency of this cable is upto 100 MHz. This type of cable is primarily used in today's Networking Environment.
  •  CAT 6 defines a four pair cable that provides and improved performance as compared to CAT 5e.
  • CAT 7 defines a fully shielded twisted pair cable that operates at a signal frequency of 600MHz. Fully shielded means all four pairs have a additional shield on them.


(2.3) Shielded Twisted pair cable ( STP ) :-

      A pair of wires wound around each other and each pair is placed inside a protective foil wrap to protect it from Crosstalk. This wire is placed in an outer copper braid to protect it from external interface ( Electromagnetic force and Radio frequency ) STP is less susceptible to external interference as the shielding absorbs all the EMI and RFI signals. STP can be used in environments that are near electrical units and radio towers. STP is cheaper than fiber optic cables but more expensive than UTP. These cables are also suitable for places that are sensitive to electrical currents. An example of this would be laboratories. High security buildings with various types of equipment will also be benefited by using STP cable.


Note :-

      STP provides better protection from crosstalk and other interference as compared to UTP.

Shielded Twisted Pair cable
Shielded Twisted Pair cable



Shielded Twisted Pair cable
Shielded Twisted Pair cable
      Use of STP cables reduces the interference on the account of electrical noise within and outside the cable. STP cables are used for business installation. The STP cable types are CAT 5, CAT 5e, CAT 6.



(2.3.1) Advantages of STP :-

  1. Better protection from Crosstalk
  2. Better protection fro External interference
  3. Secured data transmission

(2.3.2) Disadvantages of STP :-

  1. Costlier than UTP
  2. Difficult to intsall as compared to UTP.
Read: Tramission Media - 3                                     





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