What is multiplexing in computer network & its different types!
Hello friends. Welcome to the SIL BLOG. So today in this post, we will learn about what is multiplexing and what are the types of multiplexing.
Friends, today we will know about multiplexing which is used for Analog and Digital stream Signal. In this post i will also give you information about four types of multiplexing which you can read and know about multiplexing.
What is Multiplexing?
A technique by which various Analog and Digital stream Signals of transmission can be processed simultaneously on a link is called Multiplexing. In other simple words, there is a technique by which Analog or Digital stream Signal or different data signals can be successfully shared together is called multiplexing.
Multiplexing divides the high-capacity medium into the low-capacity logical medium. Which is later shared by various currents to a high capacity medium in a low capacity medium. Using physical medium (cable) and light the communication is possible on the radio frequency in the air.
All mediums are capable of multiplexing. When many senders try to send Analog and Digital stream Signals through a single channel then a device called Multiplex splits the physical channel and allots each one. At the other end of the communication, a D-multiplex receives data through a single medium and identifies each, and sends it to different receivers.
Types of Multiplexing:
Friends, hope you have come to know from the above information what multiplexing is, now let us talk about its types. There are four types of multiplexing. The details of which are given below, which you can read and know about them.
•Frequency Division Multiplexing (FDM)
•Time Division Multiplexing (TDM)
•Wavelength Division Multiplexing (WDM)
•Code Division Multiplexing (CDM)
FDM Frequency Division Multiplexing:-
FDM refers to - Frequency Division Multiplexing. When the carrier is frequency then FDM is used. FDM is an analog technique. Spectrum & carrier bandwidth is divided into logical channels by FDM and each logical channel is granted by one user.
Every user can use the channel frequency freely and has special access. All channels are divided in this way. That they do not overlap with each other. The channel is separated by a guard band. The guard band is a frequency.
Time Division Multiplexing (TDM):-
TDM refers to Time Division Multiplexing. TDM mainly applies to digital signals. But it can also be used in analog signals. The shared channel in TDM is split between its users through time slots. Each user can transmit data within the slot provided.
Digital signals are divided into frames. Which is equal to a time slot ie An optimally sized frame that can be sent in a given time slot. TDM works in synchronized mode. Both ends, ie multiplex and demultiplex are synchronized over time and both go to the next channel simultaneously.
When channel A moves its frame to one end. So D-multiplex sent media to channel A at the next end. As soon as Channel A's Time Slot ends. It switches to side-channel B. At the next end, D-multiplex works in a synchronized manner and provides media to channel B. Signals from different channels travel in an interleaved manner.
Wavelength Division Multiplexing (WDM):-
WDM refers to - Wavelength Division Multiplexing. Light has different wavelengths i.e. colors. Using different wavelengths many optical carrier signals can be multiplied into optical fibers in fiber optic mode.
It is an Analog multiplexing technology and is ideologically similar to FDM. But uses light as signals. Also, Multiplexing can be incorporated to accommodate more data signals at each wavelength time division.
Code Division Multiplexing (CDM):
Multiple data signals are often transmitted at one frequency using Code division multiplexing. FDM divides the frequency into smaller channels. However, CDM always allows its users to transmit full bandwidth and signal using a unique code.
CDM uses orthogonal code to transmit signals. Each station is assigned with a singular code, which is named a chip. Signals travel freely with these codes within the whole bandwidth. The receiver already recognizes the received chip-code signal.
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