204325: Data Communications and Computer Networks932.3704.file_ref... · Computer Engineering...
Transcript of 204325: Data Communications and Computer Networks932.3704.file_ref... · Computer Engineering...
Transmission Media
Adapted from lecture slides by Behrouz A. Forouzan© The McGraw-Hill Companies, Inc. All rights reserved
Asst. Prof. Mahdi [email protected]
http://profs.basu.ac.ir/abbasiComputer Engineering Department
Bu-Ali Sina University, Hamedan, Iran.
Data Communication and Computer Networks
2
Physical Layer
3
Classes of Transmission Media
4
Guided Media
Provide a conduit from one device to another
Include
twisted-pair cables
coaxial cables
fiber-optic cables
Guided Media:Copper Media
6
Twisted-Pair Cable
7
UTP – Unshielded Twisted Pair STP –Shielded Twisted Pair
UTP and STP Cables
8
Categories of UTP/STP Cables
9
Categories of UTP/STP Cables
Category Bandwidth Digital/Analog Use
1 very low Analog Telephone
2 < 2 MHz Analog/digital 4Mbps token ring
3 16 MHz Digital 10-100 Mbps Ethernet
4 20 MHz Digital 16 Mbps token ring
5 100 MHz Digital 100 – 1000 Mbps Ethernet
5E 100 MHz Digital 100 – 1000 Mbps Ethernet
6 250 MHz Digital 1 – 10 Gbps Ethernet
6A 500 MHz Digital 1 – 10 Gbps Ethernet
7 600 MHz Digital 10 Gbps Ethernet
7A 1000 MHz Digital 40-100 Gbps Ethernet
10
RJ – Registered Jack
UTP Connectors
11
UTP Performance
12
Coaxial Cable
13
RG – Radio Government
Categories of Coaxial Cables
14
BNC Connectors
Bayonet Network Connector
aka. Bayonet Neil-Concelman
Used with coaxial cables
15
Performance of Coaxial Cables
Guided Media: Optical Media
17
Optical Fiber
Based on physics of light
18
Optical Fiber
19
Propagation Modes
20
Fiber Types
21
Fiber Construction
22
Fiber-Optic Cable Connectors
23
Optical Fiber Performance
Unguided Media
25
Unguided Media: Wireless
Transport electromagnetic waves without using a physical conductor
Radio Waves
Microwaves
Infrared
Often referred to as wireless communication
26
Electromagnetic Spectrum
27
Propagation Methods
28
Bands
29
Antennas
Omni-directional Antenna Unidirectional Antennas
30
Wireless Transmission Waves
used for multicast/broadcast communications, such as radio and television
used for unicast communication such as cellular telephones, satellite networks,and wireless LANs
used for short-range communication in a closed area using line-of-sight propagation