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Simplex, Half-Duplex and Full-Duplex Communication | Transmission Modes in Communication System | ALL ABOUT ELECTRONICS | YouTubeToText
YouTube Transcript: Simplex, Half-Duplex and Full-Duplex Communication | Transmission Modes in Communication System
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Video Transcript
Hey friends, welcome to the YouTube channel ALL ABOUT ELECTRONICS.
So in this video, we will learn about the different transmission modes in the communication.
Now as you know, the data communication is basically an exchange of information between
the two devices over the specific medium.
So this information could be a voice or the text messages, or even it could be images or the videos.
Now the medium over which we are transmitting this data could be a wired medium like optical
fibers or the coaxial cables, or it could be a wireless medium.
So this data communication between the two devices can be a one-way communication or
it can be a two-way communication.
And accordingly, there are three possible types of communication. Or in other words,
there are three possible modes of transmission.
So if you see these three transmission modes, then they are simplex, half-duplex and full-duplex.
So let's see them one by one.
So when we say a simplex communication, then it is basically a one-way communication.
That means in this type of communication, the data transmission can happen
only in the one direction.
So the device which transmits the data is called the transmitter and the other device
which receives this data is known as the receiver.
So since it is a one-way communication, so the data transmission
in the other direction is not possible.
So if you see the radio or the TV broadcasting, then it is the example of the simplex communication.
Because in case of the broadcasting, there is only one-way communication.
Similarly, the communication between the CPU and the display monitor, or the communication
between the mouse and the CPU is also simplex communication.
So if you see the communication between the CPU and the monitor, then the CPU is sending
the data to the display monitor and the monitor is displaying that content on the screen.
That means that is the example of the simplex communication.
Likewise, the communication between the keyboard or the mouse, and the CPU is also one-way communication.
Because through the keyboard or the mouse, we are sending the data to the CPU.
So these are the examples of the simplex communication.
So the next type of communication is the half-duplex communication.
Now when we see a duplex communication, then it is basically a two-way communication.
But here, let us understand what do we mean by the half-duplex communication.
So here the half-duplex means, although it is a two-way communication, but it does not
allow the bi-directional communication at the same time.
That means at a time, the communication can happen only in the one direction.
And once that is over, then and then only, it is possible to transmit the data in the
other direction.
But the simultaneous communication in the both directions is not possible.
So a walkie-talkie with a push-to-talk button is the example of the half-duplex communication
where at a time, only one person can talk.
So similarly, if you see the full-duplex communication, then once again it is the two-way communication.
But in this case, it is possible to transmit the data in both directions at the same time.
So here, to achieve the simultaneous transmission in both directions,
mainly two approaches are used.
So in one approach, both the devices are transmitting the data at two different frequencies.
So as you can see, here the device A is transmitting the data at the f1 frequency, while the device
B is transmitting the data at the f2 frequency.
And since both the devices are transmitting the data at the different frequencies, so
there won't be any interference between the two transmissions.
So this approach is known as the frequency division duplexing.
So similar to the frequency division duplexing, the another approach is known as
the time division duplexing.
So in this approach, both the devices are transmitting the data on the same frequency,
but they are transmitting at the different time slots.
That means here, a single channel is divided into the time slots, and both the devices
are transmitting the data at the different time slots.
So here, since these time slots are very short, so it feels as if the transmission in both
the directions is happening almost simultaneously.
And that is why this approach is still considered as the full duplex communication.
So here, the slots in the yellow color represent when the device A is transmitting, and similarly,
the slots in the white color represent when the device B is transmitting.
So in case of the time division duplexing, if a device A wants to transmit more data,
then it is possible to allocate more transmission slots in the specific direction.
And similarly, when the device B has more data to share, then it is possible to allocate
more transmission slots in the reverse direction.
That means in this time division duplexing, if the traffic is asymmetric in both directions,
then dynamically, it is possible to increase the transmission capacity in the one direction.
So if you see the satellite communication, then it is the example of the frequency division
duplexing, where for both uplink and downlink, we have the two separate frequencies.
On the other end, the Wi-Fi is the example of the time division duplexing.
And if you see the cellular network technologies like the 4G and the 5G, then they use both
time division as well as the frequency division duplexing.
So in this way, we have three different transmission modes in the communication.
That is simplex, half duplex and full duplex.
So if you have any question or suggestion, then do let me know here in the comment section below.
If you like this video, hit the like button and subscribe the channel for more such videos.
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