Dccn
BANDWIDTH UTILIZATION MULTIPLEXING AND SPREADING
Bandwidth utilization is the wise use of available bandwidth to achieve specific goals.
It is achieved by utilizing the bandwidth in 2 categories.
Multiplexing means combining the number of channels into one.
Spreading means that privacy and ant jamming.
MULTIPLEXING:-
Multiplexing is the set of techniques that allows the simultaneous transmission of multiple signals across a single data link.
In multiplexing, we have n input lines and the output is one line, i.e., many to one the demultiplexer takes the one input line and it gives the number of output line, one to many.
Here the word link refers to the physical path and the word channel refers to the portion of a link that carries a transmission between a given pair of lines. One link can have many n channels.
[pic][pic]
FREQUENCY DIVISION MULTIPLEXING
FDM is an analog technique that can be applied when the bandwidth of a link is greater than the combined bandwidth of the signals to be transmitted.
In FDM, signals are generated by each sending device modulated different carrier frequencies.
These modulated signals are then combined into a single composite signal that can be transported by the link.
Carrier frequencies are separated by sufficient bandwidth to accommodate the modulated signal.
Channels can be separated by strips of the guard bands to prevent signals from overlapping.
FDM is an analog multiplexing technique that combines analog signals.
[pic][pic][pic]
WAVE DIVISION MULTIPLEXING
In WDM, is designed to use the high data rate capability of fiber optic cable.
The optic cable data rate is higher than the data rate of the metallic cable.
WDM is same as the FDM, except the multiplexing and demultiplexing involve optical signals transmitted through fiber optic channels.
We are combining different signals of different frequencies, the difference that the frequencies are very high.
Bandwidth utilization is the wise use of available bandwidth to achieve specific goals.
It is achieved by utilizing the bandwidth in 2 categories.
Multiplexing means combining the number of channels into one.
Spreading means that privacy and ant jamming.
MULTIPLEXING:-
Multiplexing is the set of techniques that allows the simultaneous transmission of multiple signals across a single data link.
In multiplexing, we have n input lines and the output is one line, i.e., many to one the demultiplexer takes the one input line and it gives the number of output line, one to many.
Here the word link refers to the physical path and the word channel refers to the portion of a link that carries a transmission between a given pair of lines. One link can have many n channels.
[pic][pic]
FREQUENCY DIVISION MULTIPLEXING
FDM is an analog technique that can be applied when the bandwidth of a link is greater than the combined bandwidth of the signals to be transmitted.
In FDM, signals are generated by each sending device modulated different carrier frequencies.
These modulated signals are then combined into a single composite signal that can be transported by the link.
Carrier frequencies are separated by sufficient bandwidth to accommodate the modulated signal.
Channels can be separated by strips of the guard bands to prevent signals from overlapping.
FDM is an analog multiplexing technique that combines analog signals.
[pic][pic][pic]
WAVE DIVISION MULTIPLEXING
In WDM, is designed to use the high data rate capability of fiber optic cable.
The optic cable data rate is higher than the data rate of the metallic cable.
WDM is same as the FDM, except the multiplexing and demultiplexing involve optical signals transmitted through fiber optic channels.
We are combining different signals of different frequencies, the difference that the frequencies are very high.