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第三章 通信子网 PowerPoint PPT Presentation


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第三章 通信子网. 3.1 通信基本原理 3.2 计算机网互联的硬件设备 3.3 网络拓扑结构与分类 3.4 网络的传输介质 3.5 网络互联设备产品. 3.1 通信基本原理. 计算机网络的两大基本功能: 数据通信 与 数据处理 。 数据通信本身是一门独立的学科。. 数据通信就是 依照通信 协议 ,利用数据传输技术在 两个功能单元 之间传递数据 信息。. 数据通信与传统电报或电话 相比的特点: 实现的计算机之间或计算机与人 之间的通信,需要定义 严格的通信 协议或标准 。 数据传输的准确性和可靠性高。

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第三章 通信子网

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  • 3.1

  • 3.2

  • 3.3

  • 3.4

  • 3.5


3.1



  • 108

  • 102





3.1.1


ASCII





Hzb/s




3.1.2

  • ASKFSKPSK

    NRZ



2.

u(t)

u(t)=Umsin( t+)

Um


  • ASK

  • Umsin( t+) 1

  • U(t)=

  • 0 0


(2) FSK

Umsin(1 t+0) 1

U(t) =

Umsin(2 t+0) 0


(3) PSK

Um sin( t+0) 1

U(t) =

Um sin(t+) 0


201


4

4

00011011

4445


3.


(1) NRZ

01

NRZ


(2)

TT/2T/2

T/2T/2



(3)

01


4. PCM


PCM

PCM

PCM


PCM



f>=2B1/T>=2fMAX

BTfMAX



K

KLog2K


PCM

128

7


3.1.3


3.1.4



3






3.1.5




A

2

B

1

3

6

5

4






2.



A

2

B

1

3

6

5

4





//



3.



A

2

B

1

3

6

5

4



/




4.

ATM

ATM


3.1.6


2.

MUX


FDMA



TDMA





WDMA


CDMA


3.1.7


3.1.8


3002400b/s102106

48009600b/s102104


109


3.2





3.2.1

CPU


1


2


3


10M100M10M/100M1000M

PCIISAEISA



3Com

ACCTON

DLink


3.2.2




3.2.3

FDDIATM


LAN



1. 10BASET

10BASET


2.

4Mb/s10 Mb/s16 Mb/s

/LAN

/


RISC610Mb/s



/


3. EIFO

Ethernet-in-FDDI-out

/100Mb/sFDDI


EIFO/10Base-T EthernetFDDI

MAC


EIFO


4.

  • Ethernet

  • Ethernet

  • FDDI



  • 10Mb/s

  • Ethernet

  • 100Mb/s FDDI



A

B

C10Mb/s Ethernet

D100Mb/s FDDI


5. ATM

Asynchronous Transfer Mode


155Mb/s

ATMUTP

MAC

ATMLAN


6.

SNMP


3.2.4



  • LAN


MAC

LAN


Ethernet3000015000


LAN








3.2.5





  • 23




  • IP


  • IPIP


IP



3

IP over SDHIP over DWDM


CPUCPUATM


ASCI

ASCIASCI


3


IP over SDHIP over DWDM

SDHSynchronous Digital Hierarchy

DWDM


IP


IPIP IPQoS

QoS



Ipv4

RSVP

DiffServ

MPLS










:





RIP



OSPF

OSPF


5000

15



ATMX.25



3.2.6



3.3




3.4





STP

UTP5

12


3

10Mb/s10BASET4Mb/s


43

16Mb/s

10BASET16Mb/s


5100Mb/s

100Mb/s TX


RJ-45 RJ-11


  • UTP/STP

  • TIA/EIA568ATIA/EIA568B


310Mb/s10Base T4Mb/s

416Mb/s 10Base T16Mb/s

5100Mb/s100Mb/sTX


24

3003400Hz


4kHz24

268kHz


15km10Mb/s100m


  • 10100kHz


1

2BNC

CATV75



50

CATV75


50100

75




3



68


240GHz


3


3.5

Ethernet, Token-Ring, SNA, FDDI, Fast Ethernet, ATM, 1Gb Ethernet, VLAN VNET


FDDI

WAN

OSI


FDDI

100Mb/s


Fast Ethernet

10Mb EthernetCSMA/CD


/


Switch VLAN

Switch

3

VLAN


LAN

2LAN

23IP


  • Login