Transmission Media - (5)

By -

Transmission Media - 5

Summary on What we have studied on last Tutorial :-

  • A pair of wires wound around each other and each pair is placed inside a protective foil wrap to protect it from Crosstalk.
  • STP can be used in environments that are near electrical units and radio towers.
  •  STP provides better protection from crosstalk and other interference as compared to UTP.
  • 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.
  • Advantages of STP is Better protection from Crosstalk.
  • Disadvantages of STP is Costlier than UTP

(3.1) Fiber Optic Cable :-

      
      A fiber optic cable consist of a centre pure (silica) glass core not much thicker than a human hair through which light signals pass. It is surrounded by a glass cladding. Sometimes the cladding is surrounded by by PVC to increase the cable strength and provide a support for the cladding. This cladding is sometimes surrounded by a metal fibers to give extra strength to the cable. It is finally surrounded by an outer cover known as sheath as shown in figure :
Fiber Optic cable
Fiber Optic cable
Internal Parts Fiber Optic cable
Internal Parts Fiber Optic cable


       In a fiber optic cable the electrical signal is converted into appropriate left signals and transmitted through it. An emitter  sends the signals from one end of the cable and the a light sensor (Photo detector ) senses this signals and then converts into its digital equivalent. There are transceiver located at both ends of the cable where the signals are converted from electrical to light signals and vice versa. Fiber optic cables are available in different sizes with varying core and cladding diameters. But the most commonly used fiber optic cable is the 62.5/125 micrometer. Almost all network technologies that use fiber optic cable require pair of fibers to create the popular duplex fiber optic cabling.
      
      Two sources of lights : Laser and LED are used for fiber optic cable. In a fiber optic cable, signals can be transmitted in only one direction. So, two strands of cables, each contained in different cladding are used to send and receiver data signals . Kevlar fibers are used as a sheathing material as they are extremely strong.


(3.2) Advantages of Fiber optic cable :-

  1. Able to carry much more information as compared to copper cable
  2. Supports much more higher data rates
  3. Completely immune to crosstalk
  4. Much smaller and lighter in Weight as compare to copper cables
  5. Unaffected by chemicals and atmospheric conditions
  6. Covers large distances
  7. This cable is much more difficult to tap into, making it a good choice for environment with security concerns
  8. Covers large distances


(3.3) Disadvantages of Fiber optic cable :-


  1. Fiber optic wires are difficult to install, connect and repair
  2. Costly and delicate as compared to copper wire
  3. More fragile than copper wires and difficult to split.





=================================================
Thanks for Reading !
Have a Good Day !

Comments

Post a Comment

Popular posts from this blog

Transmission Media - (1)

By -
Image
Transmission Media - 1 Objectives : Cable characteristics Various types of Cables  Fiber optic cable  Connectors of fiber optic cable  Cabling Standard - EIA/TIA 568A and 568B  Straight cabling & Cross Cabling   Introduction :-       Networking involves connection of computers, workstations and peripheral devices. Networking hardware involves all the peripheral devices,interface cards and other equipment such as cables and wires that are used to establish a network connection. Wire is a single, cylindrical strand of metal conductor with low resistance to the current flow. Cable can be defined as a bunch of wires bound together which may be or insulted. You can connect these devices either using physical transmission medium or using wireless transmission medium. Physical transmission media involves the use of wires and cables. (1) Characteristics of Cables  :       Before selecting a ca...
Read more

OSI Model - 1

By -
Image
Open system Interconnection  (OSI) Model - 1 Open System Interconnection (OSI) Model  :-            Open System Interconnection (OSI) Model was developed by the International Standards Organization (ISO) describes the flow of information from one computer to another. OSI model is also called ISO OSI Reference Model. It is conceptual model that has seven layers. Physical, Data link, Network, Transport, Session, Presentation and Application are the seven layers of OSI model. Each layer performs distinct functions on the data in accordance with the precious layer functions. The application, presentation and session layers are called as Upper layers.  7 layers of OSI model           All the layers of the OSI reference model use different protocols. Protocol defines the procedure that is to be followed during data transmission. It is the set of specified rules and standards used to transmit data fr...
Read more

Transmission Media - (7)

By -
Image
Transmission Media - 7 Summary on What we have studied on last tutorial  :- Single Mode :  A type of cable that has only single strand of glass fiber with a thin diameter. This is a 9/125 micrometer fiber cable. The diameter of a core glass is approximately 9 micrometer. Multi mode :   A type of cable that contains a glass fiber with a larger diameter. Multiple modes of light signals can be propagated through it. This is 62.5/125 micrometer fiber cable. A connector is a mechanical device that is attached to the fiber optic cable or the light source. Straight tip ( ST) :  It was developed by AT&T. A popular connector used with the fiber optic cables and used in Gigabit Ethernet or backbone. Joins individual fibers to optical devices. Sub Miniature Type A (SMA) :  Defines a connector that uses two individual connectors for each fiber strand. Subscriber/Standard Connector (SC) :  A type of low-cost connector used in 100 Base-FX fibe...
Read more