Data communication & networks

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what is data. data communication ,and networks.

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Data communication & networks

  1. 1. Data consist on raw facts and figures.by using an object data can be easily get. while information is process foam of data. data is not certain while information is certain. Data process information
  2. 2. Electronically transmission of data from one place to another place by using a medium is called data communication. There are three components of data communication Sender  Medium receiver
  3. 3.  The way of transmission of data from one place to other is called data transmission mode  There is three transmission modes  Simplex Mode  Half duplex Mode  Full duplex Mode
  4. 4. Simplex mode • • • • Data can flow only in one direction Not moved in both direction.one way street Not perform both action either send or receive data Direction of flow not changes Half duplex • Data can flow in both directions but not at same time • One way at one time • Device with half duplex mode can send and receive data but not at same time Full duplex • Data can flow in both directions simonstenously • Fast speed and time is not waited
  5. 5. Simplex Half Duplex Full Duplex
  6. 6.   Digital signals are transmitted in sequence of voltage They represented in binary foams    Digital Data Transmission Continues in foam of wave and this wave is called carrier wave The number of wave repeats during a specific time is known as frequency. The height of carrier wave is called amplititude Analogue Data transmission
  7. 7.  A computer network is a set of two or more computers connected through to share information and other resources through cables, satelite,or telephone cables. There is three types of networks LAN(local area networks)  WAN(wide area networks)  MAN(metropoletin area networks) 
  8. 8. The physical layout or the way in which network connection are made is called network topologies. Bus topology Ring topology Star topology
  9. 9. consists of a single cable—called a bus— connecting all nodes on a network without intervening connectivity devices
  10. 10. Every node on the network is connected through a central device

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