Basic Concepts of Circuit switch vs packet switch

1. DEPARTMENTOF ELECTRONICS & COMMUNICATION ENGINEERING
BIT MESRA, RANCHI
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2. Circuit Switched VS Packet
Switched Connection
• GAURAV BISWAS
• BIT MESRA
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3. NO CONTENTS PAGE
1 Circuit Switching 4
2 Circuit Establishment 5
3 Packet Switching 6-7
4 Benefits of Packet Switching 8
5 Higher data rate is obtained in HSCSD .
Always on connection.
9-10
6 Packet Switch vs. Circuit Switching 11-13
7 Conclusion 14
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4. Circuit Switching
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 uses a dedicated path between two stations
 path is reserved for the single pair of end users
 has three phases
circuit establish
data transfer


 circuit disconnect
 inefficient
channel capacity dedicated for duration of connection
if no data, capacity wasted


 inefficient use of the path if there is bursty traffic


set up (connection) takes time – setup time
once connected, transfer is transparent

5. Circuit Establishment
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Mumbai
New Delhi
- Once the circuit is setup the transmission
is transparent  no transmission delay and
no delay variations
Fig:-1 Circuit Establishment

6. Packet Switching
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

circuit switching was designed for voice
packet switching was designed for data
 transmitted in small packets
 packets contains user data and control info


user data may be part of a larger message
control info includes routing (addressing) info
 packets are received, stored briefly
(buffered) and past on to the next node
 packets are queued

7. Packet Switching
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Fig:-2 Packet Switching.

8. Advantages
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 line efficiency


single link shared by many packets over time
packets queued and transmitted as fast as
possible
 data rate conversion


stations connect to local nodes at their own speed
nodes buffer data if required to equalize rates


packets accepted even when network is busy
priorities can be used

9. Higher data rate is obtained in
HSCSD:-
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GSM Offers only one time slot(out of 8 time) for a
user
Whereas HSCSD allow 4 consecutive time slots
supports a data rate of 57.6kbps (4*14.4)
In principle a user can be assigned all the 8 time
slots supporting a data rate of 115.2kbps (8*14.4)
In this way HSCSD brings a straightforward
improvement in data rate by combining several
traffic channels together.

10. Always on Connection:-
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GPRS permits always on Connection,
which means a connection is already
available.
Always on Connection doesn’t required
to be set up just prior to data transfer.

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Circuit & Packet Switched
Network:-
Fig:-3 Circuit & Packet Switched Network.

12. Packet Switch vs. Circuit Switching
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13. Differences:-
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14. Conclusion:-
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For Data transmission Packet
Switching is the more efficient
than Circuit Switching whereas, when it
comes to voice transmission Circuit
switching is more efficient than packet
switching

15. References:-
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1. Sanjay Kumar,” Wireless Communication”, River Publishers, 2015.
2. https://images.google.com/ - “Google Images”.

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