Q1[4 Marks]Introduction
(a) Define any six performance/impairment parameters common in digital data communication. [3]
(b) Using a suitable generic real-world example of a digital communication system, explain its functioning in full-duplex mode.
ENCT 253Bachelor in Computer Engineering · Semester 42 Papers Available
Data Communication
Past examination question papers and complete curriculum syllabus for Data Communication (ENCT 253), Bachelor in Computer Engineering Semester 4 under Institute of Engineering (IOE), Tribhuvan University.
Sem 4 Subjects (6)View Full Semester Overview →
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Year-wise & Session-wise Exam Papers
Complete questions from each exam session (Regular & Back exams from 2082 to 2069) for Data Communication. Click any session paper to expand.
Showing 241 questions across 22 exam session papers
Institute of Engineering • 2083 Baishakh Board Examination
Q2[5 Marks]Transmission Media and Data Compression
(a) Compare coaxial cable, twisted pair, and optical fiber based on bandwidth, cost, and use case. [2]
(b) Encode "Solve ." using Shannon-Fano Encoder, and find the transmission efficiency. [5+2]
(c) Using any example of a 3x3 generation matrix, demonstrate how LBC corrects a single bit error.
Q3[6 Marks]Transmission Media and Data Compression
Compare optical fiber with UTP.
Q4[8 Marks]Signal Encoding Technique
With the help of necessary mathematical expressions and sketches, explain the principle of AM.
Q5[8 Marks]Multiplexing and Switching
Write short notes on: (Any Three) [3x4]
(a) Packet Switching
(b) Analog versus digital communication
(c) Hamming Codes
(d) Shannon-Hartley channel capacity theorem
(e) Linear Block Coding
Q6[8 Marks]Cellular Wireless Communications and Latest Trends
Write short notes on (Any Two): [2x4]
(a) Evolution of mobile communication technologies from 1G to 5G
(b) Checksum
(c) LAN vs MAN
(d) Packet switching vs circuit switching
Q7[4 Marks]Data Communication Fundamentals
a) With suitable examples, explain how linearity of a system is checked. [5]
b) Mention the conditions and properties of Fourier transformation.
Q8[3 Marks]Signal Encoding Technique📐 Diagram in Paper
(a) Draw the waveform for the bit sequence 100000101 using each one suitable unipolar, polar and bipolar Encoders. [6]
(b) Compare single tone-AM with that of double-tone with basic mathematical formulations and performance parameters. [5]
(c) Describe ASK, PSK and FSK with signal diagrams.
Q9[4 Marks]Data Communication Fundamentals
a) Compare digital and analog hierarchies with detailed block diagram showing number of channels and data-rate. [4]
b) Demonstrate the operation of CDMA for 8 users among whom four users are sending bit 1, two users are sending bit 0 and remaining two are silent.
Q10[5 Marks]Data Communication Fundamentals
Define any five performance parameters that describe the quality of data communication.
Q11[4 Marks]Cellular Wireless Communications and Latest Trends
Encode 100000000101 using Polar RZ and B8ZS coding schemes.
Q12[5 Marks]Signal Encoding Technique
Differentiate ASK from PSK. Prepare a constellation diagram of 16-QAM.
Q13[8 Marks]Transmission Media and Data Compression
With suitable example, demonstrate how checksum detects error in data communication.
Q14[6 Marks]Data Communication Fundamentals
With proper examples, differentiate between power and energy signals.
Q15[8 Marks]Signal Encoding Technique
Encode ‘Gen-Z Generation’ using Huffman coding technique, and calculate the transmission efficiency.
Curriculum Syllabus & Course Topics
Sourced from TU curriculum portalChapter-wise Units & Micro-Syllabus Topics (6 Units)
1. Introduction
- 1.1Analog data communication, data representation, data flows
- 1.2Evolution of data communication
- 1.3A communication model, data communication model
- 1.4Networks (LAN, WAN), simplified network architecture, the OSI model
- 1.5Data communication and networking for today enterprise
2. Data Communication Fundamentals
- 2.1Analog and digital data
- 2.2Analog signals, periodic and aperiodic signals, periodic signals characteristics (Time, frequency domain)
- 2.3Introduction to Fourier series representation of periodic signal, Fourier transform representation of aperiodic signals, digital signals and its characteristics
- 2.4Analog and digital transmission, transmission mode, transmission impairments (Attenuation, distortion, noise)
- 2.5Data rate limits channel capacity, Nyquist bandwidth, Shannon capacity formula
- 2.6Performance of network (Bandwidth, throughput, latency, jitter)
3. Transmission Media and Data Compression
- 3.1Guided transmission media: Co-axial cable, twisted pair, optical fiber
- 3.2Unguided transmission media: Radio waves, microwaves, infrared
- 3.3Antenna basics, satellite communication, Bluetooth, Wi-Fi
- 3.4Wireless propagation (Introduction to groundwave propagation, sky wave propagation and line of sight propagation), frequency bands
- 3.5Error detection and correction: Parity, check sum, cyclic redundancy check, hamming code
- 3.6Data compression: Lossy and lossless
4. Signal Encoding Technique
- 4.1Analog data, analog signals: Modulation and its need, AM, FM, PM
- 4.2Analog data, digital signals: PAM, PWM, PPM, PCM, DPCM, DM
- 4.3Digital data, analog signal: ASK, FSK, PSK, QPSK, QAM
- 4.4Digital data, digital signal: RZ, NRZ, AMI, Manchester, differential Manchester, B8ZS, HDB3 for data transmission
5. Multiplexing and Switching
- 5.1Access introduction to multiplexing, application of multiplexing
- 5.2Frequency division multiple
- 5.3Time division multiple access
- 5.4Asymmetric digital subscriber line, XDSL
- 5.5Spread spectrum: DHSS, FHSS, CDMA
- 5.6Intro switched communication network, connection oriented and connectionless
- 5.7Switching devices: Types, importance and application
- 5.8Circuit switching network: Circuit switching concepts, message switching
- 5.9Packet switching: Virtual switching, datagram switching
6. Cellular Wireless Communications and Latest Trends
- 6.1Overview of 1G, 2G, 3G and 4G
- 6.2Cellular technology fundamental terminology: Cell, frequency-reuse, cluster, adjacent cell interference, co-channel interference, handoff strategies, architecture of GSM basics
- 6.3Introduction to 5G networks, software defined networking, IOT communication, cloud computing and virtualization in data communication
Examination Scheme & Marks Distribution
Evaluation Structure
- Final Board Theory Exam: 60 Marks (Pass mark: 24)
- Internal Assessment: 40 Marks (Pass mark: 16)
- Practical / Lab Exam: 25 or 50 Marks (Continuous lab evaluation + viva, where applicable)
* This is the general current IOE 60/40 scheme; verify course-specific details in the syllabus above.
Exam Preparation Guidelines
- Review the 2 available past examination papers to identify recurring patterns, core problem types, and chapter weightage.
- Cross-reference key answers with official syllabus units, standard textbooks, and lecture notes.
- Structure answers with labeled diagrams, concise bullet points, and highlight final answers in numerical solutions.
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Curriculum Syllabus & Marking Scheme