Transmission Media Cables
Transcript of Transmission Media Cables
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7.1
Chapter 7
Transmission Media
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
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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
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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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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 Fiber optics: 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
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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
Radio waves are used for multicast communications, such as radio and
television, and paging systems. They can penetrate through walls.
Highly regulated. Use omni directional antennas
Note
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Figure 7.20 Omnidirectional antenna
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7.29
Microwaves are used for unicast communication such as cellular telephones, satellite networks,
and wireless LANs.Higher frequency ranges cannot
penetrate walls.Use directional antennas - point to point
line of sight communications.
Note
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7.30
Figure 7.21 Unidirectional antennas
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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
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7.32
Wireless Channels
Are subject to a lot more errors than guided media channels.
Interference is one cause for errors, can be circumvented with high SNR.
The higher the SNR the less capacity is available for transmission due to the broadcast nature of the channel.
Channel also subject to fading and no coverage holes.