February 14, 2020
Amitraj
3.) Message Switching -
Message switching works in a different manner, in which it first stores the messages and then forwards those messages to the dedicated receiver. Unlike circuit switching, it does not need the dedicated path for the communication. It was the major demerit of the circuit switching where the calling and called parties must be connected with each other through a dedicated path. However, circuit switching is very suitable for the telephone systems as it serves the purpose fairly.
Earlier, the telegraph system was used for enabling electrical communication in place of a telephone. The telegraph system was less expensive than the telephone system because text messages transmitted in this environment are not real-time and conversational. This gives the rise to the store and forward postal system which we are using in the message switching.
In the message switching scheme, the message sent by the source is collected by an operator. The operator transmits the message to the intermediate nodes without having any knowledge about whether the path is vacant for the message or not. The message is transmitted from node to node and stored in a node if the forward node link is unavailable. Once the link is available, the message is sent to the next node.
Every message contains the complete source and destination address. The message switching technique also creates delay, as it makes the message to be stored in a node until it gets the link of the forward node. Although this delay is tolerable as the environment is not real time and is beneficial in utilising the transmission media effectively.
Advantages -
1. It improves the channel efficiency over Circuit Switched Network.
2. It is helpful in reducing traffic congestion.
3. It is helpful in setting the message priorities due to store and forward technique.
Disadvantages -
1. It is extremely slow due to store and forward technique.
2. Also, the message has to wait until sufficient resources become available to transfer it to the next switch.
Message switching works in a different manner, in which it first stores the messages and then forwards those messages to the dedicated receiver. Unlike circuit switching, it does not need the dedicated path for the communication. It was the major demerit of the circuit switching where the calling and called parties must be connected with each other through a dedicated path. However, circuit switching is very suitable for the telephone systems as it serves the purpose fairly.
Earlier, the telegraph system was used for enabling electrical communication in place of a telephone. The telegraph system was less expensive than the telephone system because text messages transmitted in this environment are not real-time and conversational. This gives the rise to the store and forward postal system which we are using in the message switching.
In the message switching scheme, the message sent by the source is collected by an operator. The operator transmits the message to the intermediate nodes without having any knowledge about whether the path is vacant for the message or not. The message is transmitted from node to node and stored in a node if the forward node link is unavailable. Once the link is available, the message is sent to the next node.
Every message contains the complete source and destination address. The message switching technique also creates delay, as it makes the message to be stored in a node until it gets the link of the forward node. Although this delay is tolerable as the environment is not real time and is beneficial in utilising the transmission media effectively.
Advantages -
1. It improves the channel efficiency over Circuit Switched Network.
2. It is helpful in reducing traffic congestion.
3. It is helpful in setting the message priorities due to store and forward technique.
Disadvantages -
1. It is extremely slow due to store and forward technique.
2. Also, the message has to wait until sufficient resources become available to transfer it to the next switch.
