LGW2EChapter1figures

LGW2EChapter1figures - Chapter 1 Communication Networks and...

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Chapter 1 Communication Networks and Services Chapter Figures
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Leon-Garcia/Widjaja Communication Networks 1.0E+00 1.0E+02 1.0E+04 1.0E+06 1.0E+08 1.0E+10 1.0E+12 1.0E+14 1850 1875 1900 1925 1950 1975 2000 Figure 1.1
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Leon-Garcia/Widjaja Communication Networks Figure 1.2
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Leon-Garcia/Widjaja Communication Networks User 2 (a) User 1 User N (b) (c) Figure 1.3
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Leon-Garcia/Widjaja Communication Networks Tandem CO Toll CO CO CO CO Tandem CO = central office Figure 1.4
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Leon-Garcia/Widjaja Communication Networks 1. The caller picks up the phone triggering the flow of current in wires that connect to the telephone office. 2. The current is detected, and a dial tone is transmitted by the telephone office to indicate that it is ready to receive the destination number. 3. The caller sends this number by pushing the keys on the telephone set. Each key generates a pair of tones that specify a number. (In the older phone sets, the user dials a number that in turn generates a corresponding number of pulses.) 4. The equipment in the telephone office then
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