Tr Transmission Media 01204325 Data Communications and Computer Networks Chaipo Chaiporn J n Jaik aikae aeo De Department of f Computer Engineering Kasetsart Unive versity Based on lecture materials from Data Communications and Networking, 5 th ed., Behrouz A. Forouzan, McGraw Hill, 2012. Revised 2019-08-12
Out Outline line • Guided media ◦ Copper ◦ Optical fiber • Unguided media 2
Ph Physic ical L al Layer er from Data Link to Data Link Frame Frame 01001011 01001011 (bits) Transmission medium 3
Cl Classe sses s of of Transm smissi ssion on Me Media 4
Guided M Guided Media: edia: Co Copper pper Medi Media
Twisted-Pa Tw Pair Cable 6
UTP UTP a and S nd STP TP C Cabl bles UTP – Unshielded Twisted Pair STP –Shielded Twisted Pair 7
Ca Categ egories es of UTP/STP Ca Cables es 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 8
UTP UTP C Conne nnect ctors RJ – Registered Jack 9
Coaxial Ca Coa Cable 10
Ca Categori ories s of of Coa Coaxial Ca Cables RG – Radio Guide 11
BN BNC C Con Connector ors • B ayonet N etwork C onnector ◦ aka. Bayonet Neil-Concelman • Used with coaxial cables 12
UTP UTP and and Coa Coaxial Pe Performance www.ti.com/lit/an/sboa123/sboa123.pdf 13
Guided M Guided Media: edia: Op Optical Med Media
Op Optic ical Fiber al Fiber • Based on physics of light Image from Wikipedia 15
Optic Op ical Fiber al Fiber 16
Pr Propagat ation Modes Multi-mode, step index Multi-mode, graded index Single-mode 17
Fi Fibe ber T Type pes 18
Fi Fibe ber C Cons nstruct uction 19
Fi Fiber er-Op Optic C Cable C Connectors 20
Op Optic ical Fiber al Fiber P Per erformance mance 21
Un Ungu guid ided Media ia
Ungui Unguide ded M d Medi dia: Wi : Wireless • Transport electromagnetic waves without using a physical conductor ◦ Radio Waves ◦ Microwaves ◦ Infrared • Often referred to as wireless communication 23
El Electr trom omagneti tic Spectru trum 24
Propagat Pr ation Methods 25
Bands Ba 26
Antennas An Omni-directional Antenna Unidirectional Antennas 27
Wir Wireles eless T Trans ansmis missio ion W n Waves es used for multicast/broadcast used for unicast communication used for short-range communications, such as radio and such as cellular telephones, communication in a closed television satellite networks, area using line-of-sight and wireless LANs propagation 28
Summa Summary • Guided media serve as conduits for signals to propagate • Copper media carry electrical signals • Optical fibers carry optical signals • Unguided media allow signals to propagate without any cable 29
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