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SECTION B : 60 MARKS BAHAGIAN B : 60 MARKAH INSTRUCTION: This section consists of FOUR (4) structured questions. Answer ALL questions. ARAHAN: Bahagian ini mengandungi EMPAT (4) soalan berstruktur. Jawab SEMUA soalan. QUESTION 1 SOALAN 1 (a) Define communication system and identify ONE (1) element of communication system. Nyatakan definisi sistem komunikasi dan kenalpasti SATU (1) elemen sistem komunikasi. (b) With the aid of suitable diagrams, describe the TWO (2) transmission modes that are commonly used today. Dengan bantuan gambarajah yang sesuai, jelaskan DUA (2) mod penghantaran yang biasa digunakan hari ini. [5 marks] [5 markah] (c) Given the Noise Figure (NF) of a non-linear amplifier is 5dB. At the input, the signal power is 500µW and the noise power is 2µW. Calculate the Noise Factor (F) and the Output Signal to Noise Power (SNR out ). Diberi Noise Figure (NF) untuk penguat bukan linear ialah 5dB. Pada bahagian masukan, kuasa isyarat ialah 500µW dan kuasa hingar ialah 2µW. Kirakan Noise Factor (F) dan Nisbah Kuasa Isyarat keluaran-kepada-hingar (SNR out ). [7 marks] [7 markah] 6 SULIT

QUESTION 2 SOALAN 2 (a) List THREE (3) analog modulation techniques. Senaraikan TIGA (3) teknik pemodulatan analog. (b) Sketch the THREE (3) analog modulation techniques you answered in Question 2(a) above. Lakarkan gambarajah TIGA (3) teknik pemodulatan analog yang anda jawab pada Soalan 2(a) di atas. (c) A digital signal has TWO (2) levels. Calculate how many bits are needed per level if 10110001 to be sent and sketch those digital signals. Isyarat digital mempunyai DUA (2) paras. Kira bit yang diperlukan bagi setiap paras sekiranya 10110001 hendak dihantar dan lakarkan isyarat digital tersebut. QUESTION 3 SOALAN 3 a) List THREE (3) types of guided transmission medium. Senaraikan TIGA (3) jenis media penghantaran terpandu. b) Discuss the characteristics of Twisted-Pair Cable used in data communication. Bincang ciri-ciri kabel pasangan terpiuh yang digunakan dalam komunikasi data. [5 marks] [5 markah] 7 SULIT

c) With aid of a diagram, illustrate TWO (2) types of antenna used in communication system. Dengan bantuan gambarajah, terangkan DUA (2) jenis antena yang digunakan dalam sistem komunikasi. [7 marks] [7 markah] QUESTION 4 SOALAN 4 (a) Define and state ONE (1) application of data communication. Takrif dan nyatakan SATU (1) aplikasi komunikasi data. (b) Interpret the symbol below by using ASCII and EBCDIC code. Tafsirkan simbol di bawah dengan mengunakan Kod ASCII dan EBCDIC. Table B4 / Jadual B4 ASCII 010 1000 100 1000 110 0101 100 1100 101 0000 010 1001 EBCDIC 1101 0001 1010 0100 1101 0101 0111 1011 1111 0001 1111 0010 (c) A standard telephone circuit has a Signal-to-Noise power ratio of 1000 W. Calculate the Shannon limit for information capacity if the highest frequency is 6 khz and the lowest frequency is 3 khz. Litar telefon biasa mempunyai nisbah kuasa Isyarat-kepada-Hinggar bernilai 1000 W. Kira had Shannon untuk kapasiti maklumat jika frekuensi tertinggi ialah 6 khz dan frekuensi terendah ialah 3 khz. 8 SULIT

SECTION C : 30 MARKS BAHAGIAN C : 30 MARKAH INSTRUCTION: This section consists of TWO (2) essay questions. Answer ALL questions. ARAHAN: Bahagian ini mengandungi DUA (2) soalan esei. Jawab SEMUA soalan. QUESTION 1 SOALAN 1 Modulation is the process of varying one or more properties of a periodic waveform, called the carrier signal, with a modulating signal that typically contains information to be transmitted. In Digital Modulation, information signal is in digital waveform; while carrier signal is in analog waveform. There are three types of digital modulation. Identify that THREE (3) types of the digital modulation and explain each of them with using a waveform of data 110100. Pemodulatan adalah proses yang mengubah satu atau lebih sifat-sifat gelombang berkala, yang dipanggil isyarat pembawa, dengan isyarat modulatan yang biasanya mengandungi maklumat yang akan dihantar. Di dalam Pemodulatan Digital, isyarat maklumat berbentuk gelombang digital; manakala isyarat pembawa pula berbentuk gelombang analog. Terdapat tiga jenis pemodulatan digital. Kenal pasti TIGA (3) jenis Pemodulatan Digital tersebut dan terangkan setiap satunya dengan menggunakan bentuk gelombang data binari 110100. [15 marks] [15 markah] 9 SULIT

QUESTION 2 SOALAN 2 The utilization of bandwidth can be achieved by Multiplexing and Demultiplexing technique. There are two basic forms of multiplexing used: Time Division Multiplexing (TDM) and Frequency Division Multiplexing (FDM). Illustrate with the aid of a diagrams the TDM Multiplexing and Demultiplexing Process for input 0001, 1011 and 1101 that are sent from three different computer. Penggunaan jalur lebar boleh dicapai dengan teknik Pemultipleksan dan Nyahpemultipleksan. Terdapat dua bentuk asas pemultipleksan yang digunakan iaitu Pemultipleks Pembahagian masa (TDM) dan Pemultipleks Pembahagian Frekuensi (FDM). Terangkan beserta gambarajah Proses Pemultipleksan dan Nyahpemultipleksan TDM bagi 3 masukan data 0001, 1011 dan 1101 daripada 3 pengguna komputer yang berbeza. [15 marks] [15 markah] SOALAN TAMAT 10 SULIT