Different types of multiplexing used in data communication
Answers
Answered by
0
Different type of multiplexing is used in communication. In this article, the following three major multiplexing techniques are discussed:
Frequency division multiplexing
Wavelength division multiplexing
Time division multiplexing
1. Frequency Division Multiplexing
In the 20th century, many telephone companies used frequency-division multiplexing for long distance connections to multiplex thousands of voice signals through a coaxial cable system. For shorter distances, cheaper balanced cables were used for various systems like bell systems K-and N-carrier, but they didn’t allow large bandwidths. The FDM is an analog multiplexing that combines analog signals. Frequency division multiplexing is applied when the bandwidth of the link is greater than the combined bandwidth of the signals to be transmitted.
2. Wavelength Division Multiplexing
Wavelength division multiplexing (WDM) is a technology in fibre optic commucation; and, for the high capacity communication systems, wavelength division multiplexing is the most promising concept. This system uses multiplexer at transmitter to join signals and demultiplexer to split the signals apart, at the receiver end. The purpose of WDM is to combine multiple light sources into a single light source at the multiplexer; and, at the demultiplexer the single light is converted into multiple light sources.
3. Time-Division Multiplexing
Time division multiplexing is a technique used to transmit a signal over a single communication channel by dividing the time frame into slots – one slot for each message signal. Time-division multiplexing is primarily applied to digital signals as well as analog signals, wherein several low speed channels are multiplexed into high-speed channels for transmission. Based on the time, each low-speed channel is allocated to a specific position, where it works in synchronized mode. At both the ends, i.e., the multiplexer and demultiplexer are timely synchronized and simultaneously switched to the next channel.
I googled this question a bit and found this...
Note! - I have added some of my words.
Frequency division multiplexing
Wavelength division multiplexing
Time division multiplexing
1. Frequency Division Multiplexing
In the 20th century, many telephone companies used frequency-division multiplexing for long distance connections to multiplex thousands of voice signals through a coaxial cable system. For shorter distances, cheaper balanced cables were used for various systems like bell systems K-and N-carrier, but they didn’t allow large bandwidths. The FDM is an analog multiplexing that combines analog signals. Frequency division multiplexing is applied when the bandwidth of the link is greater than the combined bandwidth of the signals to be transmitted.
2. Wavelength Division Multiplexing
Wavelength division multiplexing (WDM) is a technology in fibre optic commucation; and, for the high capacity communication systems, wavelength division multiplexing is the most promising concept. This system uses multiplexer at transmitter to join signals and demultiplexer to split the signals apart, at the receiver end. The purpose of WDM is to combine multiple light sources into a single light source at the multiplexer; and, at the demultiplexer the single light is converted into multiple light sources.
3. Time-Division Multiplexing
Time division multiplexing is a technique used to transmit a signal over a single communication channel by dividing the time frame into slots – one slot for each message signal. Time-division multiplexing is primarily applied to digital signals as well as analog signals, wherein several low speed channels are multiplexed into high-speed channels for transmission. Based on the time, each low-speed channel is allocated to a specific position, where it works in synchronized mode. At both the ends, i.e., the multiplexer and demultiplexer are timely synchronized and simultaneously switched to the next channel.
I googled this question a bit and found this...
Note! - I have added some of my words.
Similar questions