DCN_rpj9

DCN_rpj9 - NT503: Data Communication & Networking...

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1 Multiplexing - I
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2 Multiplexing Multiplexing : Many to one (e.g. sharing of channel) Demultiplexing : One to many
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3 Multiplexing Vs No multiplexing
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4 Types of multiplexing
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5 Frequency Division Multiplexing (FDM) ¾ Each signal is modulated with a different carrier frequency ¾ Hence each station is confined to a certain frequency band ¾ Carrier frequencies separated by guard bands so signals do not overlap (e.g. broadcast radio) and interference can be avoided.
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6 Frequency Division Multiplexing (FDM) ¾ Total capacity of the communication channel has to be higher than sum of individual capacities of stations. ¾ Suitable for analog signals Station-1 Station-2 Station-3 60 65 Communication Channel 66 71 72 77
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7 FDM in time domain ¾ Station frequencies are multiplexed over a communication channel
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8 FDM in frequency domain
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