Question 1: Chose the correct answer1).. . achieve a higher data rate for longer-distance applications(Twisted-Pair Links, Coaxial cables)with higher frequencies.(increase , decrease)2) The path loss....3) For wireless channels, the achievable data rate is.. than the one....suggested by Shannon's formula(higher , lower)... methods is that a polarity error.(NRZ Inverted , natural and polar NRZ coding)is device used to provide connections among multiple users and4) A problem with5)...to connect several pieces of a LAN.(Repeater, Hub, Bridge)checks the physical address of any destination user(Repeater, Hub, Bridge)6)7) Increasing the window size for sliding-window flow control..efficiency....the link.....(increase , decrease)8) The problem of.. . methods is the existence of low frequency components.(NRZ coding, Manchester)has no DC component9)(natural NRZ , polar NRZ)10) Error propagation occurs in(natural NRZ , NRZ inverted)11)Isolate traffic between two LANS(router, bridge)

achieve a higher data rate for longer-distance applications (Twisted-Pair Links , Coaxial cables) 1).. with higher frequencies. (increase , decrease) 2) The path loss 3) For wireless channels, the achievable data rate than the one suggested by Shannon's formula (higher , lower) methods is that a polarity error. 4) A problem with (NRZ Inverted , natural and polar NRZ coding) is device used to provide connections among multiple users and 5)... .

achieve a higher data rate for longer-distance applications (Twisted-Pair Links , Coaxial cables) 1).. with higher frequencies. (increase , decrease) 2) The path loss 3) For wireless channels, the achievable data rate than the one suggested by Shannon's formula (higher , lower) methods is that a polarity error. 4) A problem with (NRZ Inverted , natural and polar NRZ coding) is device used to provide connections among multiple users and 5)... .

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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1) What is the major factor that makes coaxial cable less susceptible to noise than twistedpair cable? (a) Inner conductor (b) Diameter of cable (c) Outer sheath (d) Insulating material 2) Aliasing can be defined as errors occurring when (a) The sample rate exceeds twice the input frequency.(b) The bandwidth is less than the input frequency.(c) The number of bits per sample is low.(d) The sampling signal has been incorrectly identified. 3) In _______encoding, three levels are used: positive, zero, and negative. (a) Unipolar RZ (b) Bipolar RZ (c) Polar NRZ (d) Manchester NRZ 4) The ________ rate defines the number of data elements sent in 1sec; the ______ rate isthe number of signal elements sent in 1sec. (a) data; signal (b) signal; data (c) bit; baud (d) baud; bit5) The channel capacity of a noiseless channel can be improved by (a)Increasing the signal-to-noise ratio. (b) Decreasing the channel bandwidth.(c) Applying error correction technique. (d) Applying M-ary modulation scheme. 6)…
06: Suppose the carrier waveform illustrate below with assuming a group of 10 information signals xi (t), i 1,2,3, ...10. each signal has a band of 1 kHz. Consider all ten signals are multiplexed using the TDM technique after each signal is multiplied by the carrier illustrate below. What is the largest value of the time period in milliseconds? 27
If the signal at the end of a 6km cable has a power value of 2, if you knew that this cable loses 0.5 dB per km (i.e. -0.5 dB/km), then the power of the signal at the beginning of the cable was ..............
Problem 3 The modulating signal m(t) = 4 cos(200nt) cos(400nt) is multiplied by the carrier c(t) = cos(2nfct), where f. = 1000 Hz. Determine and sketch the spectra of the modulating and modulated signals. Identify the upper sideband (USB) and the lower sideband (LSB) spectra in the DSB-SC modulated signal. Problem 4 In a DSB-SC system, the carrier frequency is 10 kHz and the message signal is given by m(t) = 2 sin(2000t) + 4sin(4000nt). Find and sketch the spectra of the message signal and modulated signal. Identify the upper sideband (USB) and the lower sideband (LSB) spectra in the DSB-SC modulated signal.
Huffman coding is a channel coding scheme. (a)True (b)False
) Television channels are 6 MHz wide. How many bits/sec can be sent if four-level digital signalsare used? Assume a noiseless channel.
Problem 2 In a DSB-SC system, the carrier frequency is 5 kHz and the message signal is given by m(t) 2cos1000nt + sin2000nt. Find and sketch the spectra of the message signal and modulated signal. Identify the upper sideband (USB) and the lower sideband (LSB) spectra in the DSB-SC modulated signal. Determine the average power in the message signal as well as in each frequency component of the modulated signal. Problem 3 The modulating signal m(t) = cos1000nt cos3000nt is multiplied by the carrier c(t) = cos(2nfct), where f. = 5 kHz. Determine and sketch the spectra of the modulating and modulated signals. Identify the upper sideband (USB) and the lower sideband (LSB) spectra in the DSB-SC modulated signal.
Channel Capacity(C) was found to be 1.44 S/No where S represent signal power and No is the Noise power. Discuss in detail what 1.44 S/No means.
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QUESTION 28 An engineer has designed transmission equipment to transmit 7200 symbols per second while encoding 8 bits per symbol. If the signal to noise ratio is 400:1 and the channel bandwidth is 3625 Hz, has the engineer's design exceeded theoretical limits? O Yes, both the limit on symbol rate and the limit on bits per symbol have been exceeded. O Yes, but only the limit on symbol rate has been exceeded. O Yes, but only the limit on bits per symbol has been exceeded. O No, none of the theoretical limits have been exceeded.
Question.2(a): If the analog signal travels over a transmission medium and its input voltage is 5.5 volts and the output voltage is 1 volts then find the attenuation of a signal, also find the near end cross talk if the attenuation to cross talk ratio is 37 dB. (2 marks)
The following 5 signals are to be sampled at the Nyquist rate and multiplexed and transmitted by the means of TDM. X1(t) band-limited to 2.5kHz X2(t) band-limited to 2.5kHz X3(t) band-limited to 10kHz X4(t) = sin 5000 ? t X5(t) band limited to 5kHz The output of the multiplexer is uniformly quantized with L= 1024 and binary encoded A) setup a scheme for accomplishing this multiplexing requirement B) what must be the speed of the commutator (in sample per second )? C) what is the output bit rate? D) what is the minimum transmission bandwidth of the channel ?