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| What is multiplexing in telecommunication? | | Published by: admin 2010-03-16 |
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In telecommunications and computer networks, multiplexing (known as muxing) is a term used to refer to a process where multiple analog message signals or digital data streams are combined into one signal over a shared medium. The aim is to share an expensive resource. For example, in telecommunications, several phone calls may be transferred using one wire. File:Telecommunication-multiplexing.gif - Wikipedia, the free ::
Dec 16, 2008 File:Telecommunication-multiplexing.gif. No higher resolution available. Telecommunication-multiplexing.gif (519 × 216 pixels,
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The simplest explanation is to start with simplex, where one two way radio is talking to another, but the other can't talk back till the first one finishes transmitting (and commonly says "over") and then there is duplex, what you have with a standard telephone and so you both can talk at the same time. Multiplex is just a way to cram a whole lot of information and control into the system at the same time.
Simply put it's like this: a radio connection over a wire.
ITU-T H.223 Multiplexing Protocol for Low Bit Rate Multimedia ::
IHS - ITU-T H.223 Multiplexing Protocol for Low Bit Rate Multimedia Communication Series H: Audiovisual and Multimedia Systems Infrastructure of Audiovisual
http://electronics.ihs.com/document/abstract/JXXPZAAAAAAAAAAAHOME |
For instance, you have different radio stations, emitting on different frequencies. They do that ON AIR. If you put the same signals on a wire (such as your TV cable for instance), you will be able to deliver several voice signals on the same wire without them interfering to each other. You will need a thing similar to several radio receivers at the receiving end, each of them tuned to the appropriate frequency. There is also another thing, called time-shared multiplexing, where the radio is tuned for a short amount of time on each of the channels, delivering the respective signal to its receiver. Also, in the early days of multiplexing they used the native time sharing multiplexing. That went like this: the transmitter was sending for a short amount of time, on the same frequency, signals from each of the correspondents. At the receiving end, a similar device commuted the output from one subscriber to the other, synchronous to the emitting device, thus allowing the conversations to continue, with a certain loss in the transmitted voice spectrum (thus comes the alteration of voice over phone). Modern systems use frequency and time multiplexing, along with radio modems and complex wire systems controleld by computers to achieve this. The final purpose of all this madness is to be able to ensure transmission of large volumes of data, voice, etc. through the same limited amount of cable, optic fiber, etc. Installation of new cables of optic fiber is costly and takes long, often involving digging out berried cables. This is why multiplexing is necessary. You can't just add a new cable for each individual phone or fax subscriber. So you use multiplexing. Multiplex Power Distribution Systems::
(This is similarly used in telecommunication where several phone calls may be transferred using one wire.) At the point of transmission, multiplexing
http://www.paneltronics.com/ip.asp?op=PowerSign01HOME |
Mode multiplexing by diffractive optical elements in optical ::
The possibility to increase in the data-carrying abilities of optical communication systems by waveguide modes (both longitude and transverse) multiplexing
http://adsabs.harvard.edu/abs/2004SPIE.5480..153KHOME |
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