MultiplexingMultiplexing

Multiplexingp g

Multiplexing is the set of techniques that allows the simultaneous transmission of multiple signals across a singlesimultaneous transmission of multiple signals across a single data link.

Dua metode multiplexing yang biasa diterapkan adalah :1 F Di i i M lti l i (FDM)1. Frequency Division Multiplexing (FDM)2. Time Division Multiplexing (TDM)

Frequency Division Multiplexing (FDM)Frequency Division Multiplexing (FDM)

Pada FDM, beberapa sumber dengan spektrum frekwensip g pyg sama masingmasing akan dikonversikan ke dalam spektrum frekwensi yg berbeda , untuk kemudian ditransmisikan melalui media transmisi yang samasikan melalui media transmisi yang sama.

Contoh FDM :Band Siaran Radio Komersial AM dan BandSiaran Televisi KomersialSiaran Televisi Komersial.

Channel 1 channel (4kHz)Group 12 channels (48 kHz)Supergroup (5 groups) 60 channels (240 kHz)Mastergruop (5 groups) 300 channels (1.2 MHz)Supermastergroup (3

groups) 900 channels (3.6 MHz)

S O’R ill J J T l i ti P i i lSource: O’Reilly,J.J. Telecommunication Principles, second edition

FDM dan TDMFDM dan TDM

Sampling• This involves finding its amplitude at discrete

time intervals.• In 1928, Harry Nyquist showed mathematically

that it is possible to reconstruct a band-limited analog signal from periodic samples, as long as the sampling rate is at least twice the frequency of the highest frequency componentfrequency of the highest-frequency component of the signal.

• If the sampling rate is too low a form of• If the sampling rate is too low, a form of distortion called aliasing or foldover distortion is produced.is produced.

Tugas :g• Gambarkan diagram FDM hingga Supergroup !• Bandingkan FDM dengan TDM serta tunjukkan• Bandingkan FDM dengan TDM, serta tunjukkan

kelebihan dan kekurangan masing-masing !• Jelaskan aturan dari Nyiquis Rate !• Jelaskan aturan dari Nyiquis Rate !• Jelaskan, Apakah yang dimaksud dengan

aliasing?aliasing?• Bandingkan teknik komunikasi analog dan

digital serta tunjukkan kelebihan dandigital, serta tunjukkan kelebihan dan kekurangan masing-masin !