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THE DIFFERENCE BETWEEN CIRCUIT
SWITCHING AND PACKET SWITCHING
QUESTION: USE A SUITABLE EXAMPLE TO ILLUSTRATE THE DIFFERENCE BETWEEN
CIRCUIT SWITCHING AND PACKET SWITCHING
CIRCUIT SWITCHING
In circuit-switching, data is transmitted over a predetermined path
...
The system decides on which route to follow, based on a
resource-optimizing algorithm, and transmission goes according to the path
...
A data communication
path or circuit is dedicated to an entire message block during the process of message
transmission fron point A to point B so much so that no other message or user can access that
channel during the period in question
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21 (Used in the German DATEX-L and Scandinavian DATEX circuit switched data
network)
•
Optical mesh network
Illustration
The old telephone system (PSTN) uses circuit switching to transmit voice data
...
For our case a
connection is established between device A and device B
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All the resources to
be used during the communication are identified and reserved in this stage
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For the
entire length of the connection the path of the telephone being used cannot be used by another
message
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A signal is sent to each switch to release the
resources
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Packet Switching
In packet-switched networks, these resources are not reserved; a session's messages use the resource
on demand, and as a consequence, may have to wait (i
...
, queue) for access to a communication link
...
The block
of data is split into small units with each unit having a sequence number attached to it for orderly
identification within a given message block and these different units are usually sent across the available
different links or channels of data transmission from one end to the other end point where they arrive
at different times but have to be assembled together in the correct order at this location via the
sequence numbers to get out the original message back without any data degredation occuring as a
result of the different paths of transmissions from source to destination
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Whenever the Node A and B
have data to send, it converts them into packets and forwards them to next computer or router through
different routes as shown below
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Then, this packet is transferred to next computer or router (called as hop)
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All the packets belonging to a transmission may or may not take the same
route
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Upon arrival in computer Node C and D, they are assembled together in the correct order at this
location via the sequence numbers to get out the original message
...
yahoo
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com/computernetworkingnotes/switching/packet-switching
Last accessed:7/12/2013
Basic Data Transmission Methods
Available at:http://www
...
net/3comu/intro/units/unit04/sec04d