3 Multiplexing And Switching

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

208210 marks

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...

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20815 marks

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...

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20805 marks

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. ...

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05 marks

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...

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Time Division Multiplexing

20805 marks

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...

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20795 marks

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...

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010 marks

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...

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Packet switching phases

2080.25 marks

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...

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Frequency Division Multiplexing

2080.25 marks

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 ...

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Satellite networks

05 marks

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...

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