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Switching network. Simple switching network. Communication Network Node. provide switching facility (routing). Network Station. end node (source &destination). Commuincations is achieve by transmitting data from source to destination through a network of switching nodes.

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Presentation Transcript
simple switching network
Simple switching network

Communication Network Node

  • provide switching facility (routing)

Network Station

  • end node (source &destination)

Commuincations is achieve by transmitting

data from source to destination through a

network of switching nodes

Communication Network

switching technology
Switching technology
  • Circuit switching
    • need a connection establishment between end nodes
    • connection is maintained until one of end nodes terminates
    • Connection is dedicated to the communication between two nodes
    • Example : Public Switch Telephone Network (PSTN)
  • Packet switching
    • data are transmitted in short message called packet
    • a connection between the two end-nodes is not maintained
    • a node-to-node link can be dynamically shared by may packets
    • Example : Public Data Network (PDN) likes X.25, Frame Relay
keys different
Keys different

Keys Circuit switching Public switching

datadedicated single route different routes

message by pass temporary store at each node

node status both must be ready sender ready to send is enough

connection dedicated shared

utilization poor good

data rate fixedvary

Prioritisation not support support

routing in circuit switch
Routing in circuit switch
  • Alternate routing
    • need a connection establishment between end nodes
    • connection is maintained until one of end nodes terminates
    • Connection is dedicated to the communication between two nodes
    • Example : Public Switch Telephone Network (PSTN)
  • Adaptive routing
    • data are transmitted in short message called packet
    • a connection between the two end-nodes is not maintained
    • a node-to-node link can be dynamically shared by may packets
    • Example : Public Data Network (PDN) likes X.25, Frame Relay
public switching telephone network
Public Switching Telephone Network

end offic

subscriber loop

Long-distance office

subscriber loop (local loop)

link between subscriber and network

Intercity trunk

connecting trunk (exchanges)

switching center; localized support

subscriber

Intercity trunk (trunks)

branches between exchanges; carry

multiple voice circuits

connecting trunk

slide7
PSDN
  • PSDN is designed specifically for the transmission of data rather than voice
  • Comunication is shared

LAN

PSDN= Public Switched Data Network

LAN

PSDN

=

LAN

packets
Packets

data

header data

header data

header data

packet

packet

packet

  • Messages is broken up into a series of packets
  • Header is used to route the packet through the network
psdn switching approach
PSDN switching approach
  • Virtual Circuit
    • network protocol establish a logical route called virtual circuit
    • packets use the same route; data arrive in the order
    • similar to circuit switching ! but the route is not dedicated
    • need call setup
  • Datagram
    • each packet is transmitted independently
    • network protocols route each packet as though it were a separate message
    • packet may not arrive in the order; need protocol to ensure ordering
    • call setup is not required
virtual circuit

1.1

1.2

1.3

1.1

1.2

1.3

2.1

2.2

2.3

2.3

2.2

2.1

4

2

1

3

5

Virtual circuit

B

  • A logical connection known as
  • virtual circuit (VC) is set up
  • between two stations.
  • Packets are labled with
  • a virtual circuit number and
  • a sequence number

A

C

virtual circuit #1

B

A

C

virtual circuit #2

datagram

B.1

B.2

B.3

B.1

B.2

B.3

C.1

C.2

C.3

C.3

C.2

C.1

B.2

B.3

4

2

C.1

1

B.1

3

5

C.2

C.3

Datagram

B

  • Aeach packet is transmitted
  • independently.
  • Packets are labled with
  • a destination address and
  • may arrive out of sequence

A

C

B

A

C

routing in packet switch
Routing in packet switch
  • Fixed routing
    • each packet is transmitted independently
  • Flooding
    • network protocol establish a logical route called virtual circuit
    • packets use the same route; data arrive in the order
  • Random routing
    • the route taken is a random
  • Adaptive routing
    • the route reacts to changing conditions within the network
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