1. Communication Networks
Chapter 11
Communication Networks

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Figure 11.1a Multiplexing: (a) frequency-division multiplexing, (b) synchronous time-division multiplexing, (c) asynchronous time-division multiplexing, and d) wavelength-division multiplexing.
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Figure 11.1bc Multiplexing: (a) frequency-division multiplexing, (b) synchronous time-division multiplexing, (c) asynchronous time-division multiplexing, and d) wavelength-division multiplexing.
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Figure 11.1d Multiplexing: (a) frequency-division multiplexing, (b) synchronous time-division multiplexing, (c) asynchronous time-division multiplexing, and d) wavelength-division multiplexing.
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Figure 11.2 Communication modes: (a) simplex communication, (b) half-duplex communication, and (c) full-duplex communication.
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Figure 11.3 Duplexing: (a) frequency-division duplexing and (b) time-division duplexing.
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Figure 11.4a Multiple access: (a) frequency-division multiple access, (b) time-division multiple access, and (c) code-division multiple access.
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Figure 11.4b Multiple access: (a) frequency-division multiple access, (b) time-division multiple access, and (c) code-division multiple access.
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Figure 11.4c Multiple access: (a) frequency-division multiple access, (b) time-division multiple access, and (c) code-division multiple access.
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Figure 11.5a Vulnerable time: (a) unslotted ALOHA and (b) slotted ALOHA.
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Figure 11.5b Vulnerable time: (a) unslotted ALOHA and (b) slotted ALOHA.
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Figure 11.6 Behavior of persistence methods: (a) 1-persistent, (b) nonpersistent, and (c) p-persistent.
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Figure 11.7 Topology: (a) star, (b) mesh, (c) bus, (d) ring, and (e) tree.
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Figure 11.8 Spectrum allocation: (a) ADSL and (b) CATV.
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Figure 11.9 Private-key: (a) cryptography and (b) authentication.
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Figure Public-key: (a) cryptography and (b) authentication.
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Figure Digital-signature signing and verification processes.
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