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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) Public Switched Telephone Network ( PSTN ) is a telephone network technology that has been widely used in current communication system. List THREE (3) main elements of PSTN. Rangkaian Pensuisan Telefon Awam ( RPTA ) adalah teknologi rangkaian telefon yang digunakan secara meluas dalam sistem komunikasi masa kini. Senaraikan TIGA (3) elemen utama RPTA. [3 marks] [3 markah] b) Describe a telephone exchange used in the Public Switched Telephone Network (PSTN). Terangkan ibusawat telefon yang digunakan dalam dalam Rangkaian Pensuisan Telefon Awam ( RPTA ) [5 marks] [5 markah] c) Packet switching is the process of segmenting or broken down a message/data to be transmitted into several smaller packets. Explain the packet switch technique with the aid of a suitable diagram. Pensuisan paket merupakan proses pemecahan mesej/data ke bentuk paket yang lebih kecil untuk penghantaran. Terangkan teknik pensuisan paket dengan menggunakan gambarajah yang sesuai. [7 marks] [7 markah] 7 SULIT

QUESTION 2 SOALAN 2 (a) With the suitable aid of diagram, identify blocks in Pulse Code Modulation (PCM) process. Dengan menggunakan diagram yang sesuai, kenalpastikan blok - blok di dalam proses Pemodulatan Kod Denyut (PCM). [4 marks] [4 markah] (b) Differentiate TWO (2) characteristics of SONET and SDH. Berikan DUA (2) perbezaan ciri-ciri SONET dan SDH. [4 marks] [4 markah] (c) The European E-Line consists of 32 channels. Calculate the bit rate for one channel and line speed for E1. Saluran European E-Line mengandungi 32 saluran. Kirakan kadar bit untuk satu saluran dan kelajuan talian E1. [7 marks] [7 markah] 8 SULIT

C1 QUESTION 3 SOALAN 3 a) List THREE (3) categories of signaling. Senaraikan TIGA (3) kategori pengisyaratan. [3 marks] [3 markah] b) Construct a signaling diagram of a local call for subscriber signaling in telephone network. Bina gambarajah pengisyaratan bagi panggilan tempatan untuk pengisyaratan pelanggan dalam rangkaian telefon. c) Common Channel Signaling No.7 (CCS7) or SS7 is a worldwide standard for telecommunications, sketch the SS7 Protocol Stack. Common Channel Signaling No.7 (CCS7) atau SS7adalah standard yang digunakan di seluruh dunia untuk telekomunikasi, lakarkan SS7 Protocol Stack. 9 SULIT

QUESTION 4 SOALAN 4 C1 a ) Define Centum Call Second (CCS). Definasikan Centum Call Second. [3 marks] [3 markah] b) If a group of trunk is offered 1600 calls during the busy hour and 20 calls are lost along with the average call duration of about 7 minutes, calculate lost traffic, grade of service (B) and congestion time. Jika satu ibusawat menawarkan jumlah panggilan 1600 semasa waktu sibuk dan 20 panggilan telah hilang dengan purata tempoh panggilan adalah 7 minit, kirakan trafik hilang, gred mutu perkhidmatan dan masa sesak. c) 1000 calls are offered to a channel and 4 calls are lost. Duration of a call is 3 minutes 45 second. Calculate offered traffic, carried traffic and lost traffic. 1000 panggilan ditawarkan pada saluran dan 4 panggilan telah hilang, purata masa panggilan ialah 3 minit 45 saat. Kirakan penawaran trafik, trafik yang dibawa dan trafik yang hilang. 10 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 Time Division Multiplexing ( TDM ) is a digital multiplexing technique for combining several low rate channels into one high rate channels. The standard encoding technique TDM is Pulse Code Modulation ( PCM ). Sketch the block diagram of TDM by using PCM according to European E-line (30 channels) hierachy and explain the function for each block diagram. Pemultipleksan Pembahagi Masa ( TDM ) adalah teknik pemultipleksan digital untuk menggabungkan beberapa saluran kadar rendah kepada satu saluran kadaran tinggi. Teknik pengkodan piawaian di dalam TDM adalah Pemodulatan Kod Denyut ( PCM ). Lakarkan blok diagram bagi TDM dengan menggunakan PCM berdasarkan kepada hirarki European E-line ( 30 saluran ) dan terangkan fungsi setiap blok diagram. [15 marks] [15 markah] 11 SULIT

QUESTION 2 SOALAN 2 N&M Company wants to provide a Session Initiation Protocol application (SIP) in Voice over Internet Protocol (VoIP) to ABC Company. As a technician, you need to give a short briefing about VoIP application and the process of VoIP installation. Organize the contents of your briefing and illustrate the simple signaling diagram that show the signaling process in SIP which consists of SIP message and SIP request. Syarikat N&M akan membekalkan aplikasi Session Initiation Protokol (SIP) dalam Voice over Interner Protocol (VoIP) to Syarikat ABC. Sebagai seorang juruteknik, anda dikehendaki menyampaikan taklimat ringkat berkenaan aplikasi VoIP and proses pemasangan VoIP kepada staf Syarikat ABC. Susun aturkan isi kandungan taklimat anda dan ilustrasikan rajah pengisyaratan asas yang menunjukkan proses pengisyaratan dalam SIP yang mengandungi Mesej SIP dan Permintaan SIP [15 marks] [15 markah] SOALAN TAMAT 12 SULIT