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44 We have a channel with 4 KHz bandwidth If we want to send data at 100 Kbps, what is the minimum SNRdB What is SNR 45 What is the transmission time of a packet sent by a station if the length of the packet is 1 million bytes and the bandwidth of the channel is 200 Kbps 46 What is the length of a bit in a channel with a propagation speed of 2 x 108 mls if the channel bandwidth is a 1 Mbps h 10 Mbps c 100 Mbps -1- 7 How many bits can fit on a link with a 2 ms delay if the bandwidth of the link is a 1 Mbps h 10 Mbps c 100 Mbps -1-X What is the total delay (latency) for a frame of size 5 million bits that is being sent on a link with 10 routers each having a queuing time of 2 Ils and a processing time of 1 Ils The length of the link is 2000 Km The speed of light inside the link is 2 x 108 mls The link has a bandwidth of 5 Mbps Which component of the total delay is dominant Which one is negligible
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A computer network is designed to send information from one point to another This information needs to be converted to either a digital signal or an analog signal for transmission In this chapter, we discuss the first choice, conversion to digital signals; in 5, we discuss the second choice, conversion to analog signals We discussed the advantages and disadvantages of digital transmission over analog transmission in 3 In this chapter, we show the schemes and techniques that we use to transmit data digitally First, we discuss digital-to-digital conversion techniques, methods which convert digital data to digital signals Second, we discuss analogto-digital conversion techniques, methods which change an analog signal to a digital signaL Finally, we discuss transmission modes
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In 3, we discussed data and signals We said that data can be either digital or analog We also said that signals that represent data can also be digital or analog In this section, we see how we can represent digital data by using digital signals The conversion involves three techniques: line coding, block coding, and scrambling Line coding is always needed~ block coding and scrambling mayor may not be needed
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Line coding is the process of converting digital data to digital signals We assume that data, in the form of text, numbers, graphical images, audio, or video, are stored in computer memory as sequences of bits (see 1) Line coding converts a sequence of bits to a digital signal At the sender, digital data are encoded into a digital signal; at the receiver, the digital data are recreated by decoding the digital signal Figure 41 shows the process Characteristics Before discussing different line coding schemes, we address their common characteristics
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Signal Element Versus Data Element Let us distinguish between a data element and a signal element In data communications, our goal is to send data elements A data element is the smallest entity that can represent a piece of information: this is the bit In digital data communications, a signal element carries data elements A signal element is the shortest unit (timewise) of a digital signal In other words, data elements are what we need to send; signal elements are what we can send Data elements are being carried; signal elements are the carriers We define a ratio r which is the number of data elements carried by each signal element Figure 42 shows several situations with different values of r Figure 42 Signal element versus data element
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