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PUBLIC SWITCHED DATA NETWORKS
prepared by: Rikko Mondia
PUBLIC SWITCHED DATA NETWORKS
3 common switching techniques
CIRCUIT
Message
Switching
SWITCHING
Packet
Switching
CIRCUIT SWITCHING and PACKET SWITCHING
when we send a file over a network,
the file isn't sent as a whole, instead
the file is broken up into smaller pieces
called "packets", and this packets are sent
separately over the network to the
destination.
End of Presentation
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Packet Switching
packet switching involves dividing data messages into small bundles of information and transmitting them through communication networks to their intended destinations using computer-controlled switches.
What is PSDN?
* it is designed for transferring data only.
* comprised of one ore more wide-area data networks designed to provide access to a large number of subscribers with a wide variety of computer equipment
* the switching nodes provide end stations access to transmission media and other switching nides that will transport data from node to node until it reachers its final destination
* tandem switching nodes or switchers switches - switching nodes that connect only to other switching nodes
Message Switching
- in a form of store-and-forward
- each switch within the network has message storage capabilities
- data are not transferred in real-time; the delay time can possibly took as long as 24 hours
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