Download - Data transmission and transmission media
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ADVANCE COMPUTER NETWORK AND SECURITY
Session By:Dr.(h.c) Pravin Madalia ParmarBCA, MCA, MCP, MCTS, PDM, Ph.D (Honorary Causa)
Communication Media and Data Transmission
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Figure 7.1 Transmission medium and physical layer
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Figure 7.2 Classes of transmission media
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7.1 Guided Media
Twisted-Pair Cable
Coaxial Cable
Fiber-Optic Cable
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Figure 7.3 Twisted-pair cable
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Figure 7.4 UTP and STP
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Figure 7.5 UTP connector
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Figure 7.6 UTP performance
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Figure 7.7 Coaxial cable
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Table 7.2 Categories of coaxial cables
Category Impedance Use
RG-59 75 W Cable TV
RG-58 50 W Thin Ethernet
RG-11 50 W Thick Ethernet
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Figure 7.8 BNC connectors
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Figure 7.9 Coaxial cable performance
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Figure 7.10 Bending of light ray
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Figure 7.11 Optical fiber
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Figure 7.12 Propagation modes
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Figure 7.13 Modes
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Table 7.3 Fiber types
Type Core Cladding Mode
50/125 50 125 Multimode, graded-index
62.5/125 62.5 125 Multimode, graded-index
100/125 100 125 Multimode, graded-index
7/125 7 125 Single-mode
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Figure 7.14 Fiber construction
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Figure 7.15 Fiber-optic cable connectors
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Figure 7.16 Optical fiber performance
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7.2 Unguided Media: Wireless
Radio Waves
Microwaves
Infrared
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Figure 7.17 Electromagnetic spectrum for wireless communication
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Figure 7.18 Propagation methods
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Table 7.4 Bands
Band Range Propagation Application
VLF 3–30 KHz Ground Long-range radio navigation
LF 30–300 KHz Ground Radio beacons andnavigational locators
MF 300 KHz–3 MHz Sky AM radio
HF 3–30 MHz Sky Citizens band (CB),ship/aircraft communication
VHF 30–300 MHz Sky andline-of-sight
VHF TV, FM radio
UHF 300 MHz–3 GHz Line-of-sight UHF TV, cellular phones, paging, satellite
SHF 3–30 GHz Line-of-sight Satellite communication
EHF 30–300 GHz Line-of-sight Long-range radio navigation
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Figure 7.19 Wireless transmission waves
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Figure 7.20 Omnidirectional antennas
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Radio waves are used for multicast communications, such as radio and
television, and paging systems.
Note:
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Figure 7.21 Unidirectional antennas
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Microwaves are used for unicast communication such as cellular
telephones, satellite networks, and wireless LANs.
Note:
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Infrared signals can be used for short-range communication in a closed area
using line-of-sight propagation.
Note:
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