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SWITCHED NETWORKS by tgzIO6

VIEWS: 5 PAGES: 42

									       Data Communication and
             Networking
   Beenish Jehangir   07-04
   Uzma Noreen        07-08
   Umaima Talat       07-29
   Tayyaba Jehangir   07-33
   Erum Zahoor        07-36
   Nimra Irshad       06-27
            CONTENTS
 Methods of switches
 Structure of switches

 Phases of switches in work

 Circuit switching

        Applications
        Advantages
        Disadvantages
 Packet switching
 Types of packet switching

 Datagram network switching

        Applications
        Advantages
        Disadvantages
 Virtual networking switching

        Applications
        Advantages
        Disadvantages
      TAYABBA JAHANGIR
      ROLL # 07-33

PRESENTED ON
       SWITCHED NETWORKS
   SWITCHED NETWORKS

 A switched network consists of
series of interlinked nodes called
             switches
    METHODS OF SWITCHING IN
         NETWORKS
   Circuit switching

   Packet switching

   Message
    switching
   STRUCTURE OF SWITCHES
Types of switches are used in circuit
 switches

SPACE DIVISION SWITCH:

“The path are separated from one
  another specially”
             ADVANTAGES


   Used in analogue and digital and is
    instantaneous
        CROSS BARR SWITCH
   A cross barr
    switch connects
    n inputs to m
    outputs
             ADVANTAGE

   Can connect n*n ports
       TIME DIVISION SWITCH
   User time division multiplexing
    (TDM) inside a switch


            ADVANTAGE

Need no cross points
     TIME AND SPACE DIVISION

   Use both technique and take full
    advantage the other lack
     STRUCTURE OF PACKET
          SWITCHES
 It has four
  components
 Input ports

 Output ports

 Routing

  processor
 Switching fabrics
PHASES OF SWITCHES IN WORK
   SETUP PHASE:

   Connects sender to receiver or source to
    destination

   Resources are allocated

   Give aknowledgement of connection
    DATA TRANSMISSIN PHASE

 Data is transferred
 Resources are dedicated

           Or
 Resources are demanded
         TEAR DOWN PHASE
   Resources are freed

   Disconnect the connection between
    sender to receiver or sources
       UMAIMA TALLAT

      ROLL # 07-29

PRESENTED ON
        CIRCUIT SWITCHING
      CIRCUIT SWITCHING
 Connection oriented
 Applied in circuit switched networks

  that is made up of switches
  connected by physical links in which
  each link is developed into n number
  of channels
 Circuit switching takes place at the
  physical layer
   In circuit switching
    the resources
    need to be
    reserved during
    the set up phase
    APPLICATIONS OF CIRCUIT
          SWITCHING
 It is applied in a TDM networks such
  as LAN, WAN etc
 It is also applied in FDM networks

  such as
         telephone networks
         wireless networks
              ADVANTAGES
   Minimum time
    wastage or delay
    when data is
    transferred

Total time delay =
  connection+transfer
  +disconnet

    setup      data
    circuit
           DISADVANTAGES

   Not very efficient

   Because the data transfer the
    already allocated resources are
    unavailable to other connections
         UZMA

       ROLL # 07-08

PRESENTED ON
        PACKET SWITCHING
       PACKET SWITCHING
 The data transferred from one node
  to another in the form of data
  packets
 Use both Connectionless and
  Connection oriented techniques
 There is no resource allocation for a
  packet
 There is no reserved bandwidth on
  the links
 Also there is no scheduled
  processing time for each packets
 Resources are allocated on demand

 Packet switching is divided into two

  main types
    . Datagram network switching
    . Virtual – circuit network
       switching
     DATAGRAM NETWORK
         SWITCHING
 In this type of switching each packet
  of data is called “datagram”
 Datagram is treated independently

  of all others
 No setup or teardown phases when

  data is send
   The switching used in this type of
    networks is also called “Routing”
    because these switches are called
    routers
                 DATAGRAM
   Packet of data
    containing header in
    which destination
    address is specified

   The address remain
    same during the
    entire journey of the
    datagram
     BENISH JAHANGIR

     ROLL #07-04

PRESENTED ON
       ADVANTAGE
       DISADVANTAGES AND
 APPLICATIONS OF DATAGRAM
 NETWORK
      HOW DATA IS TRANSFER
   Each switch have
    routing table
    containing
    information of
    destination
    address and
    output ports
    switch user this
    information to
    send datagram
            APPLICATION

   Datagram network switching is used
    for internet

   The switching is done on network
    layer
            DISADVANTAGES
   Take more time
   Because different
    packets arrives to
    destination from
    different switches
Total Time Delay =
    Transmission time +
    Propogation time +
    Waiting time
            ADVANTAGES

   Resources are allocated on demand

   As there is no connection restriction
    resources can be allocated to other
    connection alternatively
        ERUM ZAHOOR

        ROLL #07-36

PRESENTED ON
           VIRTUAL NETWORK
           SWITCHING
        VIRTUAL – CIRCUIT
      NETWORKS SWITCHING

   A virtual circuit network switching is
    a cross between circuit switched
    network and a datagram network
    switching.
        It has all three phases
 Set up
 Data transfer phase

 Teardown phase



 It is implemented during data link layer
 All packets follow same path during
  established connection
 Resources can
  be allocated
  during set up
  phase or on
  demand as in
  datagram
  networks
 On this type of
  switching each
  packet contain
  two types of
  addresses
VIRTUAL SWITCHING NETWORK
       NIMRA IRSHAD

       ROLL # 06-27

PRESENTED ON
          APPLICATIONS,
          ADVANTAGES,
          DISADVANTAGES OF
          VIRTUAL NETWORK
            APPLICATIONS

   This switching is used in WAN
    networks.

   These are higher standard switches
    method so it is used in WAN’S
                      DISADVANTAGES
   The time delay of virtual circuit
    network switching for data transfer is
    more than the other two switching
    method


Total time delay =
 transmission time
 +
propagation time +
 setup delay +
 teardown delay
             ADVANTAGES

   Saves time and effort

   Because if resources allocation is on
    demand the source can check the
    availability of the resources

								
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