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Modem Communications

chapter 6. 2. Introduction. transferring a file from one computer to another translate the file into a digital signal, put that signal over the transmission facility within the network, and the receiving computer encodes the received signal to a file. BUT, in the case when we have two computers at

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Modem Communications

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    1. Chapter 6 Modem Communications

    2. chapter 6 2 Introduction transferring a file from one computer to another translate the file into a digital signal, put that signal over the transmission facility within the network, and the receiving computer encodes the received signal to a file. BUT, in the case when we have two computers attempting to transfer the same file over the analog telephone network, more steps are required.

    3. chapter 6 3 Introduction Cont’d A conversion of digital data into an analog signal must take place, since the telephone network was designed to carry analog signals. Digital data transmitted as an analog signal means that the discrete data elements are transmitted as a continuous signal. This type of data and signal combination typically requires the use of a modem.

    4. chapter 6 4 Topics covered in this chapter: Role of modem in data communications Modem modulation techniques Signaling and bit rate Huffman code compression Facsimile compression techniques Asymmetric Digital Subscriber Line (ADSL)

    5. chapter 6 5

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