February 06, 2020
Amitraj
Transmission modes
-> The way in which data is transmitted from one device to another device is known as transmission mode.
-> The transmission mode is also known as the communication mode.
-> Each communication channel has a direction associated with it, and transmission media provide the direction. Therefore, the transmission mode is also known as a directional mode.
-> The transmission mode is defined in the physical layer.
The Transmission mode is divided into three categories:-
1. Simplex
2. Half-duplex
3. Full-duplex
1. Simplex Channel-
A simplex communication channel can send the signals only in one direction.
Thus, entire bandwidth of the channel can be used during the transmission.
Example-
Radio station
Radio station is a good example of a simplex communication channel.
A radio station always sends signals to its audience.
It never receives signals from the audience.
2. Half Duplex Channel-
A half duplex communication channel can send signals in both the directions but in only one direction at a time.
It may be considered as a simplex communication channel whose transmission direction can be switched.
Example-
Walkie-Talkie
Walkie-Talkie is a good example of a half duplex channel.
Walkie-talkie has a push-to-talk button.
This button is used to turn on the transmitter but turn off the receiver.
When the button is pressed, transmitter can not hear the receiver but receiver can hear the transmitter.
3. Full Duplex Channel-
A full duplex communication channel can send signals in both the directions at the same time.
Full duplex communication channels greatly increases the efficiency of communication.
Example-
Telephone
Telephone is a good example of a full duplex channel.
Both the persons can speak as well as hear each other at the same time.
Channel Capacity-
The total number of bits a channel can hold is called as its capacity.
Capacity of a half duplex channel
= Bandwidth x Propagation delay
Capacity of a full duplex channel
= 2 x Capacity of a half duplex channel
= 2 x Bandwidth x Propagation delay
-> The way in which data is transmitted from one device to another device is known as transmission mode.
-> The transmission mode is also known as the communication mode.
-> Each communication channel has a direction associated with it, and transmission media provide the direction. Therefore, the transmission mode is also known as a directional mode.
-> The transmission mode is defined in the physical layer.
The Transmission mode is divided into three categories:-
1. Simplex
2. Half-duplex
3. Full-duplex
1. Simplex Channel-
A simplex communication channel can send the signals only in one direction.
Thus, entire bandwidth of the channel can be used during the transmission.
Example-
Radio station
Radio station is a good example of a simplex communication channel.
A radio station always sends signals to its audience.
It never receives signals from the audience.
2. Half Duplex Channel-
A half duplex communication channel can send signals in both the directions but in only one direction at a time.
It may be considered as a simplex communication channel whose transmission direction can be switched.
Example-
Walkie-Talkie
Walkie-Talkie is a good example of a half duplex channel.
Walkie-talkie has a push-to-talk button.
This button is used to turn on the transmitter but turn off the receiver.
When the button is pressed, transmitter can not hear the receiver but receiver can hear the transmitter.
3. Full Duplex Channel-
A full duplex communication channel can send signals in both the directions at the same time.
Full duplex communication channels greatly increases the efficiency of communication.
Example-
Telephone
Telephone is a good example of a full duplex channel.
Both the persons can speak as well as hear each other at the same time.
Channel Capacity-
The total number of bits a channel can hold is called as its capacity.
Capacity of a half duplex channel
= Bandwidth x Propagation delay
Capacity of a full duplex channel
= 2 x Capacity of a half duplex channel
= 2 x Bandwidth x Propagation delay
