data transmission layer.
1. ……………….. refers to information that is continuous.
A) Analog data
B) Digital data
C) Analog signal
D) Digital signal
A device for digital data transmission, preceded the invention of the telephone, an analog communications instrument, by more than thirty-five years. 1 Following the invention of the telephone, it appeared that analog transmission would become the dominant form of electrical communications. Indeed, this was true for. Digital Data Digital SignalWatch more Videos at By: Mr. Arnab Chakraborty. Analog Transmission Two forms of transmission:. digital transmission: data transmission using square waves. analogtransmission: datatransmissionusingallother waves Four possibilities to consider:. analog data via analog transmission → “as is” (e.g., radio). analog data via digital transmission → sampling (e.g. This video shows the basic concept of Serial and Parallel data transmission. It then covers the characteristics and applications of asynchronous and synchron.
2. ………………. refers to information that has discrete states.
A) Analog data
B) Digital data
C) Analog signal
D) Digital signal
3. …………… has infinitely many levels of intensity over a period of time.
A) Analog data
B) Digital data
C) Analog signal
D) Digital signal
4. ………….. can have only limited number of defined values which is often simple as 0 or 1.
A) Analog data
B) Digital data
C) Analog signal
D) Digital signal
A) periodic
B) framed
C) non periodic
D) discrete
Digital Data Transmission
6. The …………….. of a signal is the absolute value of its highest intensity, proportional to the energy it carries.
A) phase
B) peak amplitude
C) frequency period
D) period
7. ……………….. refers to the amount of time in seconds, a signal needs to complete one cycle.
A) phase
B) peak amplitude
C) frequency
D) period
8. …………… is the position of the waveform relative to time 0.
A) phase
B) peak amplitude
C) frequency
D) period
9…………………… is the rate of change with respect to time.
A) phase
B) peak amplitude
C) frequency
D) period
10. …………….. is a characteristic of a signal traveling through a transmission medium which binds the period or the frequency of a simple sine wave to the propagation speed of the medium.
A) Period
B) Frequency
C) Web-length
D) Phase
11. ……………. is actually a combination of simple sine waves with different frequencies, amplitudes and phases.
A) Composite signal
B) Combined signal
C) Hybrid signal
D) All of the above
12. A …………. can be transmitted only a limited distance before attenuation, noise and other impairments distorts the integrity of the data.
A) Analog signal
B) Digital signal
C) Hybrid signal
D) All of the above
13. To achieve longer distances, the analog transmission system includes ………………. that boost the energy of the signal.
A) repeaters
B) amplifiers
C) routers
D) boosters
14. A ……………….. receives the digital signal, recovers the pattern of 1s and 0s and re-transmits a new signal.
A) repeater
B) amplifier
C) router
D) booster
15. State whether the following statements are True or False for digital signal.
i) Analog data are encoded using a codec to produce digital bit stream
ii) Digital data are encoded to produce a digital signal with desired properties.
A) i-True, ii-False
B) i-True, ii-True
C) i-False, ii-True
D) i-False, ii-False
16. In digital transmission, analog signal propagated through ………………..
A) repeaters
B) amplifiers
C) routers
D) boosters
17. We can compare the performance of analog transmission with that of digital transmission system based on the following factors.
i) effect of noise ii) distance to be covered iii) services provided
A) i and ii only
B) ii and iii only
C) i and iii only
D) All i, ii and iii
18. …………….. receive the signal and noise at their input separate out the signal from noise and regenerate the signal which is free from noise.
A) repeaters
B) amplifiers
C) routers
D) separators
19. Which of the following are the advantages of digital transmission.
i) Digital transmission has better noise immunity
ii) It is possible to detect and correct the errors introduced during the data transmission.
iii) Digital transmission require a larger channel bandwidth as compared to analog system.
A) i and ii only
B) ii and iii only
C) i and iii only
D) All i, ii and iii
20. State whether the following statements are True or False for digital data transmission.
i) Digital modulation needs synchronization in case of synchronization in case of synchronous modulation.
ii) TDM(Time Division Multiplexing) technique can be used to transmit many voice channels over a single common transmission channel.
A) i-True, ii-False
B) i-True, ii-True
C) i-False, ii-True
D) i-False, ii-False
Answers
1. A) Analog data
2. B) Digital data
3. C) Analog signal
4. D) Digital signal
5. A) periodic
6. B) peak amplitude
7. D) period
8. A) phase
9. C) frequency
10. C) Web-length
11. A) Composite signal
12. B) Digital signal
13. B) amplifiers
14. A) repeater
15. B) i-True, ii-True
16. A) repeaters
17. D) All i, ii and iii
18. A) repeaters
19. A) i and ii only
20. B) i-True, ii-True
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Analog vs. Digital Transmission
Analog transmission is a method of conveying voice, data, image, signal, or video information. It uses a continuous signal varying in amplitude, phase, or another property that is in proportion to a specific characteristic of a variable. Analog transmission could mean that the transmission is a transfer of an analog source signal which uses an analog modulation method (or a variance of one or more properties of high frequency periodic waveform, also known as a carrier signal). FM and AM are examples of such a modulation. The transmission could also use no modulation at all. It is most notably an information signal that is constantly varying.
Data transmission (also known as digital transmission or digital communications) is a literal transfer of data over a point to point (or point to multipoint) transmission medium –such as copper wires, optical fibres, wireless communications media, or storage media. The data that is to be transferred is often represented as an electro-magnetic signal (such as a microwave). Digital transmission transfers messages discretely. These messages are represented by a sequence of pulses via a line code. However, these messages can also be represented by a limited set of wave forms that always vary. Either way, they are represented using a digital modulation method.
Analog transmission is capable of being conveyed in a no fewer than four ways: through a twisted pair or coax cable, through a fibre optic cable, through the air, or through water. There are, however, only two basic types of analog transmission. The first is known as amplitude modulation (or AM). This is a technique used in electronic communication and works by alternating the strength of a transmitted signal in relation to the information that is being sent. The second is known as frequency modulation (or FM). This type of communication conveys information over a carrier wave, just as AM transmission. However, FM communication alternates the frequency of the transmitted signal.
Digital Data Transmission Techniques
Data that is transmitted via digital transmission may be digital messages that have origins for a data source (a computer or a keyboard, for example). However, this transmitted data may also be from an analog signal (a phone call or a video signal, for example). It may then be digitized into a bit stream using pulse code modulation (or PCM) –or even more advanced source coding schemes. The coding of the data is carried out using codec equipment.
Summary:
1. Analog transmission conveys voice, data, image, signal, or video information using an information signal that is continuously varying; digital transmission transfers data over a transmission medium discretely.
2. Analog transmission can be conveyed in four ways: a twisted pair or coax cable, a fibre optic cable, the air, or water; digital transmission may be transmitted via an electro-magnetic signal, such as a microwave.
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