Week 4: Connecting a Network (Cabling & Hardware)

Types of Network Transmission Media

BOUNDED (WIRED)
  • Twisted pair wire
  • Coaxial cable
  • Fiber optic cable

UNBOUNDED (WIRELESS)
  • Radio signals
  • Satellite transmission
  • Infrared transmission
What is cable ?
  • Cable is the medium through which information usually moves from one network device to another. 
Type of Cable?
COAXIAL CABLE
  • Originally develop to carry large number of high-speed video transmission at one time.
  • Shield of braided wire to block electromagnetic signals from entering the cable.
  • Used in telephone transmission outside home and cable for television delivery
  • More expensive than twisted pair but less susceptible to interference.
  • Can carry more data quickly.
  • Coaxial cable has a single copper conductor at its center.
FIBER OPTIC CABLE

  • Consists of a center glass core surrounded by several layers of protective materials.
  • Fastest delivery: able to transmit signals over much longer distances than coaxial and twisted pair.
  • Transfers data represented by light pulses (billions of bit per second)
  • Each strand: carry data for several television stations or thousands of voice and only send data in one direction.
  • Example: Unifi
TWISTED-PAIR CABLE:
  • Unshielded Twisted Pair (UTP)
    • Has 4 pairs of wires inside the jacket.
    • Each pair is twisted with different number of twists per inch to help eliminate interference from adjacent pairs and other electrical devices.
    • A disadvantages: may be susceptible to radio and electrical frequency interference.
  • Shielded Twisted Pair (STP)
    • Two individual wires wrap in a foil shielding.
    • Shielding to help provide a more reliable data communication. 
    • Suitable for environment with electrical interference.
    • Disadvantage: Extra shielding cause bulky.


CABLE CONNECTOR


  • Coaxial Cable Connector.
    • The most common type of connector used with coaxial cables is the Bayonet-Neil-Concelman (BNC) Connector.
    • Different types of adapters are available for BNC connectors, including a T-connector, barrel connector, and terminator.




  • Fibre Optic Cable Connector
    • The most common type of connector used with fiber optic cable is the ST & SC connector.
  • UTP Cable Connector
    • The standard connector for unshielded twisted pair cabling is an RJ-45 Connector. (RJ=Registered Jack)
    • Look like a large telephone-style connector.
    • A slow allows RJ-45 to be inserted only one way.


TOPOLOGY AND CABLE




Network Hardware/ Equipment

  1. File Server
  2. Workstation
  3. Network Interface Cards
  4. Concentrator/Hubs
  5. Switch 
  6. Repeater 
  7. Bridges 
  8. Routers




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