What are the different types of multiplexers?

Answer 1

There are multiplexers that switch logic (digital) signals from several sources onto one line, or from one source to several different outputs (74151 through 74154 are examples).

There are analog multiplexers that route analog signals from one source to several, or vice-versa (CD4066, DG508 are examples).

A telephone T1 system is a multiplexer that takes several digitized voice signals and multiplexes them onto one line.

All of the above are examples of time-division multiplexing. Each channel is alotted an amount of time, then held off while the other channels get their time.

Another class of multiplexing is frequency division multiplexing. In this case a wide band RF channel is modulated with a complex signal that contains several smaller channels, stacked up by frequency. Channel 1 would modulate the RF channel from 1 to 10 kHz, channel 2 would modulate the RF channel from 11 to 20 kHz, channel 3 from 21 to 30 kHz, etc.

NTSC television is an example of this: the video occupies the 6 MHz band from 0 to 4.5 MHz, while the sound occupies the band from 4.5 MHz to 6 MHz (not counting the guard-bands).

FM stereo broadcast radio uses the same principal. The left + right signal occupies the base from 0 to 15 kHz, while the left-right signal occupies the band from 19 kHz to 38 kHz. They even add on extra audio channels called SCA channels up past 39 kHz.

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Answer 2

Modem :- A device that converts the digital signal from a computer to an analogue signal that can be transmitted along an ordinary phone line. This allows computers to connect to the Internet through a telephone line. Broadband :- A transmission medium capable of supporting a wide range of frequencies, typically from audio up to video frequencies. It can carry multiple signals by dividing the total capacity of the medium into multiple, independent bandwidth channels, where each channel operates only on a specific range of frequencies. Multiplexer :- A device that can send several signals over a single line. They are then separated by a similar device at the other end of the link. This can be done in a variety of ways: time division multiplexing, frequency division multiplexing and statistical multiplexing. Multiplexers are also becoming increasingly efficient in terms of data compression, error correction, transmission speed and multi-drop capabilities

Answer 3

The different types of multiplexers:

1.)Analog
a.)frequency division WDM.
b.)wave division WDM.
2.)Digital
a.)Time division.
1.)sychronous TDM.
2.)Asychronous TDM.


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