3955,3934,3935,3936,3926,3932,3931,3950,3953 Q1)Which type of analog & digital signal we use in data communication? ->1)Periodic analog signal 2)Non-periodic signal.
Q2)How many bits are needed if signal has "1" levels? ->logL(to the base 2).
Q3)What is bit rate? ->The bit rate is the number of bits sent in 1 second.
Q4)What is bit lenght? ->The bit length is the distance one bit occupied on the transmission medium.
Q5)Based on Fourier analysis,a digital signal is______________analog signal? 1)Opposite 2)parallel to 3)composite 4)perpendicular to ->3)composite.
Q6)List the way to transmit digital signal? ->1)Broadband Transmission 2)Baseband Transmission.
Q7)What is baseband transmission? ->Baseband transmission means sending a digital signal over without changing digital signal to analog signal.
Q8What is low pass channel? ->A channel with a broadband that starts from zero is called low pass.
Q9)What are signal impairment? ->The siganl at the beginning of the medium is not the same as the signal at the end of the medium.
Q10)What are the causes of impairment? ->1)Attenuation 2)Distortion 3)Noise
Q11)What is attenuation? ->Loss of energy is called as attenuation.
Q12)What is distortion? ->Signal changes its form or shape is called as distortion.
Q13)Whta is value of SNR if the channnel is noiseless? ->infinity
Q14)List the factors on which data rate depends? ->1)bandwidth 2)levels of signals 3)quality of channel.
Q15)Whta is Nyquist bit rate formula for noiseless channel? ->bitrate=2 X Bandwidth X logL(to the base 2).
Q16)What is Shannon capacity formula for noisy channel? ->capacity=bandwidth X log(1+SNR)(to the base 2).
Q17)What is bandwidth in hertz? ->Range of frequencies that a channel can pass is called bandwidth in hertz.
Q18)What is bandwidth bit per second? ->Speed of bits transmission in channel or link is called bandwidth in bits per second.
Q19)What is line coding? ->Line coding is the process of converting digital data to digital signal.
Q20)What is baseline wandering? ->The average of recieved signal power is called baseline.A long string of 0's or 1's that cause a drift in the baseline is called as baseline wandering.
Q21)List the type of line coding scheme? ->1)Unipolar 2)Polar 3)Bipolar 4)Multilevel 5)Multitransition.
Q22)List the data transmission modes? ->1)Parallel 2)serial.
Q23)What is Isochronous serial data transmission? ->Tha data arrives at fixed rate without delays between frames is called as Isochronous serial data transmission.
Q24)List the devices used in physical layer? ->1)Repeater 2)Passive hub 3)Active hub.
Q1.What is NRZ? Ans. The most straight forward form of digital modulation is to use a positive voltage to represent a 1 and a negative voltage to represent a 0. For an optical fiber,the presence of light might represent a 1 and the absence of light might represent a 0. This scheme is called NRZ (Non-Return-to-Zero).
Q2- Define 1) Baseband signal 2) Passband signal Ans. 1)Signals that run from 0 up to a maximum frequen cy are called baseband signals.
2)Signals that are shifted to occupy a higher range of frequencies, as is the case for all wireless transmissions, are called passband signals.
Q3.List characteristics of Line Coding. Ans. 1- Signal element vs data element. 2- Signal rate vs data rate. 3- Bandwidth. 4- Baseline wandering. 5- DC components. 6- Self synchronization. 7- Built-in error detection. 8- Immunity to noise & interference. 9- Complexity.
Roll no.3928 Q1.Write 2 advantages of circuit switching? Ans. 1)Onces the circuit has been set up, communication is fast and without error.
Q2.Define types of Hub? Ans. Two types of Hubs:- 1) Passive Hub 2) Active Hub
Q3.Define passive hub? Ans. A passive hub is just a connector. It simply connects all the inputs Data received on any line is sent out across all lines.
3955,3934,3935,3936,3926,3932,3931,3950,3953
ReplyDeleteQ1)Which type of analog & digital signal we use in data communication?
->1)Periodic analog signal
2)Non-periodic signal.
Q2)How many bits are needed if signal has "1" levels?
->logL(to the base 2).
Q3)What is bit rate?
->The bit rate is the number of bits sent in 1 second.
Q4)What is bit lenght?
->The bit length is the distance one bit occupied on the transmission medium.
Q5)Based on Fourier analysis,a digital signal is______________analog signal?
1)Opposite 2)parallel to 3)composite 4)perpendicular to
->3)composite.
Q6)List the way to transmit digital signal?
->1)Broadband Transmission
2)Baseband Transmission.
Q7)What is baseband transmission?
->Baseband transmission means sending a digital signal over without changing digital signal to analog signal.
Q8What is low pass channel?
->A channel with a broadband that starts from zero is called low pass.
Q9)What are signal impairment?
->The siganl at the beginning of the medium is not the same as the signal at the end of the medium.
Q10)What are the causes of impairment?
->1)Attenuation 2)Distortion 3)Noise
Q11)What is attenuation?
->Loss of energy is called as attenuation.
Q12)What is distortion?
->Signal changes its form or shape is called as distortion.
Q13)Whta is value of SNR if the channnel is noiseless?
->infinity
Q14)List the factors on which data rate depends?
->1)bandwidth 2)levels of signals 3)quality of channel.
Q15)Whta is Nyquist bit rate formula for noiseless channel?
->bitrate=2 X Bandwidth X logL(to the base 2).
Q16)What is Shannon capacity formula for noisy channel?
->capacity=bandwidth X log(1+SNR)(to the base 2).
Q17)What is bandwidth in hertz?
->Range of frequencies that a channel can pass is called bandwidth in hertz.
Q18)What is bandwidth bit per second?
->Speed of bits transmission in channel or link is called bandwidth in bits per second.
Q19)What is line coding?
->Line coding is the process of converting digital data to digital signal.
Q20)What is baseline wandering?
->The average of recieved signal power is called baseline.A long string of 0's or 1's that cause a drift in the baseline is called as baseline wandering.
Q21)List the type of line coding scheme?
->1)Unipolar 2)Polar 3)Bipolar 4)Multilevel 5)Multitransition.
Q22)List the data transmission modes?
->1)Parallel 2)serial.
Q23)What is Isochronous serial data transmission?
->Tha data arrives at fixed rate without delays between frames is called as Isochronous serial data transmission.
Q24)List the devices used in physical layer?
->1)Repeater 2)Passive hub 3)Active hub.
Roll no.3903
ReplyDeleteQ1.What is NRZ?
Ans.
The most straight forward form of digital modulation is to use a positive voltage to represent a 1 and a negative voltage to represent a 0. For an optical fiber,the presence of light might represent a 1 and the absence of light might represent a 0. This scheme is called NRZ (Non-Return-to-Zero).
Q2- Define
1) Baseband signal
2) Passband signal
Ans.
1)Signals
that run from 0 up to a maximum frequen cy are called baseband signals.
2)Signals
that are shifted to occupy a higher range of frequencies, as is the case for all wireless transmissions, are called passband signals.
Q3.List characteristics of Line Coding.
Ans.
1- Signal element vs data element.
2- Signal rate vs data rate.
3- Bandwidth.
4- Baseline wandering.
5- DC components.
6- Self synchronization.
7- Built-in error detection.
8- Immunity to noise & interference.
9- Complexity.
Roll no.3928
ReplyDeleteQ1.Write 2 advantages of circuit switching?
Ans.
1)Onces the circuit has been set up, communication is fast and without error.
Q2.Define types of Hub?
Ans.
Two types of Hubs:-
1) Passive Hub
2) Active Hub
Q3.Define passive hub?
Ans.
A passive hub is just a connector. It simply connects all the inputs Data received on any line is sent out across all lines.