WT - Circuit & Packet switching
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Packet switching breaks messages into packets that are sent independently over multiple routes, while circuit switching establishes a dedicated channel for the duration of a call. Packet switching is more efficient for bursty traffic but can lose packets, while circuit switching guarantees delivery but wastes bandwidth for intermittent calls. Both have advantages depending on the application.
WT - Circuit & Packet switching
- 1. Packet Switching Vs Circuit Switching Packet-switched and circuit-switched networks use two different technologies for sending messages and data from one point to another. Each have their advantages and disadvantages depending on what you are trying to do.
- 2. Packet Switching In packet-based networks, the message gets broken into small data packets. These packets are sent out from the computer and they travel around the network seeking out the most efficient route to travel as circuits become available. This does not necessarily mean that they seek out the shortest route. Each packet may go a different route from the others.
- 3. Packet Switching Each packet is sent with a ‘header address’. This tells it where its final destination is, so it knows where to go. The header address also describes the sequence for reassembly at the destination computer so that the packets are put back into the correct order. One packet also contains details of how many packets should be arriving so that the recipient computer knows if one packet has failed to turn up. If a packet fails to arrive, the recipient computer sends a message back to the computer which originally sent the data, asking for the missing packet to be resent.
- 4. Circuit Switching Circuit switching was designed in 1878 in order to send telephone calls down a dedicated channel. This channel remained open and in use throughout the whole call and could not be used by any other data or phone calls.
- 5. Circuit Switching There are three phases in circuit switching: • Establish • Transfer • Disconnect The telephone message is sent in one go, it is not broken up. The message arrives in the same order that it was originally sent.
- 6. Circuit Switching In modern circuit-switched networks, electronic signals pass through several switches before a connection is established. During a call, no other network traffic can use those switches. The resources remain dedicated to the circuit during the entire data transfer and the entire message follows the same path. Circuit switching can be analogue or digital
- 7. Circuit Switching With the expanded use of the Internet for voice and video, analysts predict a gradual shift away from circuit-switched networks. A circuit-switched network is excellent for data that needs a constant link from end-to-end. For example real-time video.