Basic CS [TCS Placement]: Sample Questions 65 - 66 of 196

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Question 65

Basic CS
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Describe in Detail

Essay▾

Difference between baseband and broadband transmission?

Explanation

Table of Difference between Baseband and Broadband Transmission
Baseband transmissionBroadband 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 multiplexingUses frequency division multiplexing
Bidirectional but not at the same timeUnidirectional- thus two separate channels or frequency to send or receive
Signal can travel short distancesSignals can travel over long distances
Can transmit only one signal at a timeCan 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: EthernetExample: cable TV, Wi-Fi, power line communications

Question 66

Basic CS
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Describe in Detail

Essay▾

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.
Given the Image is Define the Wavelength Division Multiplexing (WDM)

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