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Summer
2014, ASSIGNMENT
PROGRAM
BCA (REVISED FALL 2012)
SEMESTER
3
SUBJECT
CODE & NAME BCA 3040– DATA COMMUNICATION
BK
ID B1644 CREDITS 4 MAXIMUM MARKS 60
Q1
What is Transmission Impairments? Briefly explain the problems challenged by
Transmission lines.
ANSWER
- Analog
signal consist of varying a voltage with time to represent an information
steam. If the transmission media were perfectly, the receiver could receive
exactly the same signal that the transmitter sent. But communication lines are
usually not perfect, so the receive signal is not the same as the transmitted
signal. For digital data this difference can lead to errors. During data
transmission errors may be introduced due to the various impairments.
Q2
Briefly explain the communication channel with an example
Answer - Communication channel
means a medium through which electrical signals can be transmitted. A
communication channel (or simply channel), refers either to a physical
transmission medium such as a wire, or to a logical connection over a multiplexed
medium such
Q3
What is modulation? Explain why modulation is required?
Answer
-Modulation
is the process of varying one of characteristics (either amplitude or frequency
or phase) of a high-frequency periodic waveform, called the carrier signal,
with a modulating signal which typically contains information to be
transmitted. If we look at a general
Q4 Briefly explain Guided Transmission Media and its types.
Answer –
Transmission media is the
physical path between the transmitter and receiver. Physical media used for the
actual data transmission are grouped into two groups. They are:
QNO5 Briefly explain Nyquist theorem with mathematical
representation.
Answer - The Nyquist theorem
states that “a signal must be sampled at least twice as fast as the bandwidth
of the signal to accurately reconstruct the waveform” In other words, the
sampling frequency should be at least twice the highest frequency contained in
the signal. It is
Answer
- Congestion
control is concerned with controlling traffic entry into a network, so as to avoid congestive collapse
by attempting to avoid oversubscription of any of the processing or link
capabilities of the intermediate nodes and networks and taking resource
reducing steps,
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