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Transmission media

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Transmission media

  1. 1. Transmission Media(Cable) <ul><li>Prepared By: </li></ul><ul><li>Devang Bhatti </li></ul>
  2. 2. Transmission Cable Types <ul><li>Co – Axial Cable </li></ul><ul><li>Twisted Pair Cable </li></ul><ul><li>Fiber Optic Cable </li></ul>
  3. 3. Co- Axial Cable <ul><li>Characteristics of co-axial cable: </li></ul><ul><li>Used in the first Ethernet networks </li></ul><ul><li>Usually orange/black </li></ul><ul><li>Very expensive and heavy cable </li></ul><ul><li>Conductor down the center </li></ul><ul><li>Insulator surrounds conductor </li></ul><ul><li>Shielded mesh serves as outside </li></ul>
  4. 4. Coaxial cable connector <ul><li>The most common type of connector used with coaxial cables is the BNC connector </li></ul>
  5. 5. Coaxial cable connector (Cont…)
  6. 6. Coaxial cable applications <ul><li>Most versatile medium </li></ul><ul><li>Television distribution </li></ul><ul><ul><li>Cable TV </li></ul></ul><ul><li>Long distance telephone transmission </li></ul><ul><ul><li>Can carry 10,000 voice calls simultaneously </li></ul></ul><ul><ul><li>Being replaced by fiber optic </li></ul></ul><ul><li>Short distance computer systems links </li></ul><ul><li>Local area networks </li></ul>
  7. 7. Twisted Pair Cable <ul><li>Twisted Pair Cable consists of two copper wires, usually twisted around each other to cancel out any noise in the circuit </li></ul><ul><li>Two main type of Twisted Pair Cabling </li></ul><ul><ul><li>Unshielded Twisted Pair (UTP) </li></ul></ul><ul><ul><li>Shielded Twisted Pair (STP) </li></ul></ul>
  8. 8. Twisted Pair Cable <ul><li>Unshielded Twisted Pair (UTP) </li></ul><ul><ul><li>Ordinary telephone wire </li></ul></ul><ul><ul><li>Cheapest </li></ul></ul><ul><ul><li>Easiest to install </li></ul></ul><ul><ul><li>Suffers from external EM interference </li></ul></ul><ul><li>Shielded Twisted Pair (STP) </li></ul><ul><ul><li>Metal braid or sheathing that reduces interference </li></ul></ul><ul><ul><li>More expensive </li></ul></ul><ul><ul><li>Harder to handle (thick, heavy) </li></ul></ul>
  9. 9. Unshielded Twisted Pair (UTP) <ul><li>UTP has four pairs of wires inside the jacket </li></ul><ul><li>Each pair is twisted with a different number of twists per inch to help eliminate interference from adjacent pairs </li></ul>
  10. 10. UTP Categories <ul><li>Cat 3 </li></ul><ul><ul><li>up to 16MHz </li></ul></ul><ul><ul><li>Voice grade found in most offices </li></ul></ul><ul><ul><li>Twist length of 7.5 cm to 10 cm </li></ul></ul><ul><li>Cat 4 </li></ul><ul><ul><li>up to 20 MHz </li></ul></ul><ul><li>Cat 5 </li></ul><ul><ul><li>up to 100MHz </li></ul></ul><ul><ul><li>Commonly pre-installed in new office buildings </li></ul></ul><ul><ul><li>Twist length 0.6 cm to 0.85 cm </li></ul></ul><ul><li>Cat 5E </li></ul><ul><li>Cat 6 </li></ul><ul><li>Cat 7 </li></ul>
  11. 11. UTP connector
  12. 12. Shielded Twisted Pair (STP) <ul><li>STP is the original media used for token ring networks </li></ul><ul><li>STP can be used for high-speed networks, ATM, where shielding is important. </li></ul>
  13. 13. STP connector
  14. 14. Fiber Optic Cable
  15. 15. Fiber Optic Cable <ul><li>Fiber optic cabling consists of a center glass core surrounded by several layers of protective materials </li></ul><ul><li>It transmits light rather than electronic signals </li></ul><ul><li>It is the standard for connecting networks between buildings, due to its immunity to the effects of moisture and light </li></ul>
  16. 16. Fiber Optic Cable (Cont…) <ul><li>Fiber optic cable has the ability to transmit signals over much longer distances than coaxial or twisted pair </li></ul><ul><li>It can also carry information at vastly greater speeds </li></ul><ul><li>Fiber optic cable is more difficult to install than other cabling </li></ul>
  17. 17. Advantages/Disadvantages of Optical Fiber <ul><li>Advantages </li></ul><ul><ul><li>Noise resistance </li></ul></ul><ul><ul><li>Less signal attenuation </li></ul></ul><ul><ul><li>Higher bandwidth </li></ul></ul><ul><li>Disadvantages </li></ul><ul><ul><li>Cost </li></ul></ul><ul><ul><li>Installation/Maintenance </li></ul></ul><ul><ul><li>fragility </li></ul></ul>

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