Network and Data Communications · Unit 3
Multiplexing and Switching
Exam-focused notes for Multiplexing and Switching (Network and Data Communications, BIT254): what the TU syllabus asks and how it has actually been tested, with 10 solved past questions from this unit.
What this unit covers
- Time Division Multiplexing
- Frequency Division Multiplexing
- Wavelength Division Multiplexing
- Circuit switching
- Packet switching phases
- Circuit switching advantages and disadvantages
- Packet switching advantages and disadvantages
- Satellite networks
Circuit switching advantages and disadvantages
Differentiate between packet and circuit switched network.Explain the layers of OSI Reference Model in brief.[4+6]
--- (a) Difference Between Packet Switched and Circuit Switched Network Feature Circuit Switched Network Packet Switched Network --------- Connection A dedicated physical path is established before communication begins No dedicated path; data is broken into...
Full solved answer →Differentiate between circuit switching and packet switching. [5]
--- In circuit switching, a dedicated communication path is established between the sender and receiver before data transmission begins. This path remains reserved for the entire duration of the communication session. Example: Traditional telephone (PSTN) n...
Full solved answer →What is circuit switching? What are its advantages and disadvantages? [5]
Circuit switching is a method of communication in which a dedicated physical path (circuit) is established between the sender and receiver before data transmission begins, and this path remains reserved for the entire duration of the communication session. ...
Full solved answer →Differentiate between circuit switching and packet switching. What are their practical implications? [5]
Circuit Switching: A communication method where a dedicated physical path (circuit) is established between the sender and receiver before data transmission begins, and this path is held exclusively for the duration of the communication (e.g., traditional te...
Full solved answer →Time Division Multiplexing
Explain the concept of TDMA with a neat diagram. [5]
TDMA (Time Division Multiple Access) is a channel access method used in shared medium networks where multiple users share the same frequency channel by dividing the signal into different time slots. Each user is assigned a specific time slot during which th...
Full solved answer →Explain Time Division Multiplexing with required figure [5]
Time Division Multiplexing (TDM) is a digital multiplexing technique in which multiple signals (channels) share a single transmission medium by dividing the available time into discrete slots. Each signal is assigned a specific time slot in a repeating fram...
Full solved answer →Explain TDMA, FDMA and WDMA with necessary diagrams. Represent bit sequence 100101011 by the following waveform: NRZ-L, NRZ-I, Manchester, Differential Manchester[10]
--- Definition: TDMA is a channel access method where multiple users share the same frequency channel by dividing the signal into different time slots. Each user is assigned a specific time slot during which they can transmit data. Key Features: - All users...
Full solved answer →Packet switching phases
Explain different phases of packet switching. How packet switching works? [5]
Packet switching is a digital networking communication method where data is broken into smaller units called packets, which are transmitted independently across a network and reassembled at the destination. --- Packet switching operates through the followin...
Full solved answer →Frequency Division Multiplexing
Explain Frequency Division Multiplexing with required figure [5]
Frequency Division Multiplexing (FDM) is an analog multiplexing technique in which the total available bandwidth of a transmission medium is divided into several non-overlapping frequency bands (sub-channels), and each signal is assigned a unique frequency ...
Full solved answer →Satellite networks
Briefly explain satellite network. Consider a noiseless channel with a bandwidth of 3400 Hz transmitting a signal with two signals. Calculate the maximum bit rate [5]
Parameter Value ------------------ Channel type Noiseless Bandwidth ($B$) 3400 Hz Number of signal levels ($M$) 2 (two signals/levels) Theorem applicable: Nyquist Theorem (noiseless channel). --- A satellite network is a communication network that uses arti...
Full solved answer →Make Unit 3 stick
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