TCS Papers: Sample Questions 278 - 279 of 502

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Question number: 278

» Basic CS » Networks

Essay Question▾

Describe in Detail

Difference between baseband and broadband transmission?

Explanation

Table of Difference between baseband and broadband transmission

Table of Difference between baseband and broadband transmission

Baseband transmission

Broadband transmission

Entire bandwidth of the cable is consumed by a single signal.

Signals are sent on multiple frequencies, allowing multiple signals to be sent simultaneously.

May use time division multiplexing

Uses frequency division multiplexing

Bidirectional but not at the same time

Unidirectional- thus two separate channels or frequency to send or receive

Signal can travel short distances

Signals can travel over long distances

Can transmit only one signal at a time

Can transmit multiple signals simultaneously

Requires a low-pass channel, a channel with a bandwidth that starts from zero.

Uses a bandpass channel, a channel with a bandwidth that does not start from zero.

Example: Ethernet

Example: cable TV, Wi-Fi, power line communications

Question number: 279

» Basic CS » Networks

Essay Question▾

Describe in Detail

What is WDM?

Explanation

  • WDM (Wavelength-division Multiplexing) combines a number of wavelengths onto the same fiber simultaneously.

  • WDM is similar to FDM but multiplexing and demultiplexing involve light signals through fiber optics channel.

  • A powerful aspect of WDM is that each optical channel can carry any transmission format.

  • WDW dramatically increases the capacity of a fiber network and hence forms the Layer 1 transport technology in all tiers of the network.

Image shows the WDM

Image Shows the WDM

Given the image is define the Wavelength division multiplexing (WDM)