lecture-7 data communication ~
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Lecture-7 Data Communication ~www.fida.com.bdTRANSCRIPT
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7.1
Chapter 7Transmission Media
www.fida.com.bd
LECTURE-7
REFERENCE:
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7.2
Figure 7.1 Transmission medium and physical layer
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7.3
Figure 7.2 Classes of transmission media
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7.4
7-1 GUIDED MEDIA7-1 GUIDED MEDIA
Guided media, which are those that provide a conduit Guided media, which are those that provide a conduit from one device to another, include twisted-pair cable, from one device to another, include twisted-pair cable, coaxial cable, and fiber-optic cable.coaxial cable, and fiber-optic cable.
Twisted-Pair CableCoaxial CableFiber-Optic Cable
Topics discussed in this section:Topics discussed in this section:
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7.5
Figure 7.3 Twisted-pair cable
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7.6
Figure 7.4 UTP and STP cables
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7.7
Table 7.1 Categories of unshielded twisted-pair cables
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7.8
Figure 7.5 UTP connector
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7.9
Figure 7.6 UTP performance
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7.10
Figure 7.7 Coaxial cable
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7.11
Table 7.2 Categories of coaxial cables
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7.12
Figure 7.8 BNC connectors
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7.13
Figure 7.9 Coaxial cable performance
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7.14
Figure 7.10 Bending of light ray
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7.15
Figure 7.11 Optical fiber
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7.16
Figure 7.12 Propagation modes
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7.17
Figure 7.13 Modes
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7.18
Table 7.3 Fiber types
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7.19
Figure 7.14 Fiber construction
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7.20
Figure 7.15 Fiber-optic cable connectors
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7.21
Figure 7.16 Optical fiber performance
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7.22
7-2 UNGUIDED MEDIA: WIRELESS7-2 UNGUIDED MEDIA: WIRELESS
Unguided media transport electromagnetic waves Unguided media transport electromagnetic waves without using a physical conductor. This type of without using a physical conductor. This type of communication is often referred to as wireless communication is often referred to as wireless communication.communication.
Radio WavesMicrowavesInfrared
Topics discussed in this section:Topics discussed in this section:
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7.23
Figure 7.17 Electromagnetic spectrum for wireless communication
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7.24
Figure 7.18 Propagation methods
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7.25
Table 7.4 Bands
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7.26
Figure 7.19 Wireless transmission waves
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7.27
Figure 7.20 Omnidirectional antenna
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7.28
Radio waves are used for multicast communications, such as radio and
television, and paging systems.
Note
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7.29
Figure 7.21 Unidirectional antennas
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7.30
Microwaves are used for unicast communication such as cellular telephones, satellite networks,
and wireless LANs.
Note
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7.31
Infrared signals can be used for short-range communication in a closed area
using line-of-sight propagation.
Note