Media (kỹ THUẬT TRUYỀN số LIỆU SLIDE)

Transmission Media


Physical Layer

2


Classes of Transmission Media

3


Guided Media
 Provide a conduit from one device to another
 Include
 twisted-pair cables
 coaxial cables
 fiber-optic cables

4


Guided Media:
Copper Media


Twisted-Pair Cable

6

UTP and STP Cables

UTP – Unshielded Twisted Pair

STP –Shielded Twisted Pair

7


Categories of UTP/STP Cables

8


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

Digital

100 – 1000 Mbps Ethernet

Digital

1 – 10 Gbps Ethernet

Digital

1 – 10 Gbps Ethernet

Digital

10 Gbps Ethernet

Digital

40-100 Gbps Ethernet

5E
6
6A
7
7A

100 MHz
250 MHz
500 MHz
600 MHz
1000 MHz

9


UTP Connectors

RJ – Registered Jack

10


UTP Performance

11


Coaxial Cable

12


Categories of Coaxial Cables

RG – Radio Government

13


BNC Connectors
 Bayonet Network Connector
 aka. Bayonet Neil-Concelman

 Used with coaxial cables

14


Performance of Coaxial Cables

15


Guided Media:
Optical Media


Optical Fiber
 Based on physics of light

17


Optical Fiber

18


Propagation Modes

19


Fiber Types

20


Fiber Construction

21


Fiber-Optic Cable Connectors

22


Optical Fiber Performance

23


Unguided Media

Unguided Media: Wireless
 Transport electromagnetic waves without using a physical
conductor
 Radio Waves
 Microwaves
 Infrared

 Often referred to as wireless communication

25