Data Communication Multiplexing Lecture Quiz

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Questions and Answers

What is the purpose of multiplexing in data communication?

To limit the number of users accessing the medium

To minimize or eliminate interference when several users share a medium (correct)

To increase the cost of data transmission

To reduce the performance of the network

Which dimension of multiplexing is used for wireless communication?

Frequency and Code

Time and Code

Space and Time

Frequency, Time, and Space (correct)

What is an example of space division multiplexing given in the text?

Multiple users accessing the internet simultaneously

Highways with several lanes for car drivers (correct)

Different cars using the same lane at different points in time

Provision of different frequencies for wireless communication

What does time division multiplexing involve?

Allowing different users to use the same medium at different points in time Signup and view all the answers

In wireless communication, what does frequency division multiplexing (FDM) refer to?

Using different frequencies for different users Signup and view all the answers

How is code division multiplexing (CDM) carried out in wireless communication?

Using unique codes to allow multiple users to share the same frequency Signup and view all the answers

In frequency division multiplexing (FDM), why are guard spaces needed?

To prevent adjacent channel interference Signup and view all the answers

What is a disadvantage of using frequency division multiplexing (FDM) for mobile communication?

It results in a waste of frequency resources Signup and view all the answers

What is the minimum bandwidth required to multiplex five 100-KHz channels with a 10-KHz guard band between channels?

540 KHz Signup and view all the answers

What is the main difference between frequency division multiplexing (FDM) and time division multiplexing (TDM)?

TDM requires fixed assignment of a frequency to each sender Signup and view all the answers

What is the purpose of guard spaces in time division multiplexing (TDM)?

To reduce cochannel interference Signup and view all the answers

What distinguishes Synchronous Time division multiplexing (STDM) from Statistical Time division multiplexing (STDM)?

STDM allocates time slots on demand instead of on a fixed cycle Signup and view all the answers

In Code Division Multiplexing, what does the term 'code division' refer to?

Division of channels based on unique codes assigned to each sender Signup and view all the answers

Why is assigning a separate frequency for each possible communication scenario in FDM considered inefficient for mobile communication?

Because mobile communication typically takes place for only a few minutes at a time Signup and view all the answers

What problem does the use of frequency division multiplexing (FDM) solve for radio stations within the same region?

Assigning separate frequencies to each radio station Signup and view all the answers

What does guard space in Time division multiplexing (TDM) represent?

Time gaps separating different periods when senders use the medium. Signup and view all the answers

Study Notes

Multiplexing in Data Communication

The purpose of multiplexing is to enable multiple signals to share the same communication channel, increasing the efficiency of data transmission.

Dimensions of Multiplexing

The dimension of multiplexing used for wireless communication is space division multiplexing, which involves dividing the physical space into separate communication channels.

Space Division Multiplexing

An example of space division multiplexing is the use of separate antennas to transmit and receive signals.

Time Division Multiplexing (TDM)

Time division multiplexing involves dividing the time into separate slots, allowing multiple signals to share the same channel by transmitting in different time slots.

Frequency Division Multiplexing (FDM)

In wireless communication, frequency division multiplexing refers to the division of the frequency spectrum into separate channels, allowing multiple signals to be transmitted simultaneously.

Code Division Multiplexing (CDM)

Code division multiplexing involves assigning a unique code to each signal, allowing multiple signals to be transmitted simultaneously over the same channel.

Guard Spaces in FDM

Guard spaces are needed in frequency division multiplexing to prevent interference between adjacent channels, ensuring that signals do not overlap.

Disadvantages of FDM

A disadvantage of using frequency division multiplexing for mobile communication is that it requires a separate frequency for each communication scenario, which is inefficient.

Minimum Bandwidth Required for FDM

The minimum bandwidth required to multiplex five 100-KHz channels with a 10-KHz guard band between channels is 500 KHz + 5 x 10 KHz = 550 KHz.

FDM vs. TDM

The main difference between frequency division multiplexing and time division multiplexing is that FDM divides the frequency spectrum, while TDM divides the time into separate slots.

Guard Spaces in TDM

Guard spaces in time division multiplexing represent the time intervals between transmission slots, ensuring that signals do not overlap.

STDM vs. Synchronous TDM

Synchronous time division multiplexing involves fixed time slots, while statistical time division multiplexing dynamically allocates time slots based on demand.

Code Division in CDM

The term 'code division' in code division multiplexing refers to the assignment of unique codes to each signal, allowing multiple signals to be transmitted simultaneously.

Inefficiency of FDM in Mobile Communication

Assigning a separate frequency for each possible communication scenario in FDM is considered inefficient for mobile communication because it requires a large number of frequencies, leading to Spectrum scarcity.

Problem Solved by FDM for Radio Stations

Frequency division multiplexing solves the problem of radio stations within the same region interfering with each other by allowing them to transmit on separate frequencies.

Guard Space in TDM

Guard space in time division multiplexing represents the time interval between transmission slots, ensuring that signals do not overlap.

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Description

Test your knowledge on the topic of multiplexing in data communication. This quiz covers the concepts and examples related to multiplexing, including space division multiplexing and its real-life analogies.