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modulates one carrier frequency; at the next moment, the signal modulates another carrier frequency The direct sequence spread spectrum (DSSS) technique expands the bandwidth of a signal by replacing each data bit with n bits using a spreading code In other words, each bit is assigned a code of n bits, called chips
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Describe the goals of multiplexing List three main multiplexing techniques mentioned in this chapter Distinguish between a link and a channel in multiplexing Which of the three multiplexing techniques is (are) used to combine analog signals Which of the three multiplexing techniques is (are) used to combine digital signals Define the analog hierarchy used by telephone companies and list different levels of the hierarchy Define the digital hierarchy used by telephone companies and list different levels of the hierarchy Which of the three multiplexing techniques is common for fiber optic links Explain the reason Distinguish between multilevel TDM, multiple slot TDM, and pulse-stuffed TDM Distinguish between synchronous and statistical TDM Define spread spectrum and its goal List the two spread spectrum techniques discussed in this chapter Define FHSS and explain how it achieves bandwidth spreading Define DSSS and explain how it achieves bandwidth spreading
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13 Assume that a voice channel occupies a bandwidth of 4 kHz We need to multiplex 10 voice channels with guard bands of 500 Hz using FDM Calculate the required bandwidth 14 We need to transmit 100 digitized voice channels using a pass-band channel of 20 KHz What should be the ratio of bits/Hz if we use no guard band 15 In the analog hierarchy of Figure 69, find the overhead (extra bandwidth for guard band or control) in each hierarchy level (group, supergroup, master group, and jumbo group) 16 We need to use synchronous TDM and combine 20 digital sources, each of 100 Kbps Each output slot carries 1 bit from each digital source, but one extra bit is added to each frame for synchronization Answer the following questions: a What is the size of an output frame in bits b What is the output frame rate
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c What is the duration of an output frame d What is the output data rate e What is the efficiency of the system (ratio of useful bits to the total bits) 17 Repeat Exercise 16 if each output slot carries 2 bits from each source 18 We have 14 sources, each creating 500 8-bit characters per second Since only some of these sources are active at any moment, we use statistical TDM to combine these sources using character interleaving Each frame carries 6 slots at a time, but we need to add four-bit addresses to each slot Answer the following questions: a What is the size of an output frame in bits b What is the output frame rate c What is the duration of an output frame d What is the output data rate 19 Ten sources, six with a bit rate of 200 kbps and four with a bit rate of 400 kbps are to be combined using multilevel TDM with no synchronizing bits Answer the following questions about the final stage of the multiplexing: a What is the size of a frame in bits b What is the frame rate c What is the duration of a frame d What is the data rate 20 Four channels, two with a bit rate of 200 kbps and two with a bit rate of 150 kbps, are to be multiplexed using multiple slot TDM with no synchronization bits Answer the following questions: a What is the size of a frame in bits b What is the frame rate c What is the duration of a frame d What is the data rate 21 Two channels, one with a bit rate of 190 kbps and another with a bit rate of 180 kbps, are to be multiplexed using pulse stuffing TDM with no synchronization bits Answer the following questions: a What is the size of a frame in bits b What is the frame rate c What is the duration of a frame d What is the data rate 22 Answer the following questions about a T-1 line: a What is the duration of a frame b What is the overhead (number of extra bits per second) 23 Show the contents of the five output frames for a synchronous TDM multiplexer that combines four sources sending the following characters Note that the characters are sent in the same order that they are typed The third source is silent a Source 1 message: HELLO b Source 2 message: HI
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