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第八讲 广域网技术 PowerPoint PPT Presentation


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第八讲 广域网技术. 本讲主要内容. 广域网的基本概念 广域网的四种实例 X.25 分组交换网 帧中继 FR 综合业务数字网 ISDN 异步传输模式 ATM. 6.1 广域网的基本概念 6.1.1 广域网的构成. 区分局域网技术和广域网技术的关键是网络的规模。 当主机之间的距离较远时,局域网就无法完成主机之间的通信任务,这时就需要另一种结构的网络,即 广域网 。 广域网一般作为远程通信网出现。. 互联网. 结点交换机. 局域网. 局域网. 路由器. 由局域网和广域网组成互联网. 广域网. 相距较远的局域网通过路由器与 广域网 相连

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第八讲 广域网技术

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    • X.25

    • FR

    • ISDN

    • ATM


6.1 6.1.1



6-1


packet switch


6.1.2

1.

  • store and forward

  • /forward


2.

  • hierarchical addressing scheme



3.

  • 1

    2


6-4

1

2

1

2

3

4

4

3


6-16-1


6.2 X.25

  • CCITT70X.25X.25

  • X.25


X.25 DTE-DCE

X.25

DTE

DCE

X.25

VC1

VC2

DTE

DTE

DCE

DCE

X.25

X.25


6-5X.253


  • X.25

  • switched virtual circuitX.25

  • permanent virtual circuit


X.25

  • 20 90 X.25

  • PC


6.3 FR

  • X.25

  • X.25


X.25


  • PVCSVC

  • X.2564kb/sT1/E1



  • 1

    2

    3


6.4 ISDN6.4.1 ISDN

  • ISDNCCITT

  • 198410CCITTCCITT ISDNISDN


1. ISDN


2.ISDN

  • ISDN7

  • A4khz

  • B64kb/sPCM

  • C8kb/s 16kb/s

  • D16kb/s

  • E64kb/sISDN

  • H384kb/s1536kb/s1920kb/s


12B+DBRI

  • BRI64kbpsB16 kbpsDBRI/

    223B+D30B+DPRI

  • PRI23B164 kbpsD30B1D1.544MbpsPRIISDN

    31A+1C

  • ISDN64kb/sN-ISDNISDNISDNATM


3.ISDN


6.5 ATM6.5.1 ATM

  • ATM

  • ATM (cell)


6-8 ATM


6.5.2 ATM


1.

  • ATM ATM PM Physical Media Sub layerTCTransmission Sub layer

  • PM

  • TC


2.ATM

  • ATM

  • ATM :


VPx

VCx

VCy

VCz

VCx

VCy

VCx

VCy

VCz

VPy

VPz

VCI VPI VPI VCI

  • ATM

  • VCI (Virtual Channel Identifier)

  • VPI (Virtual Path Identifier)


3.ATM

  • ATMAALATMAdaptation Layer ATM


6-2 ATM


6.5.3 ATM

  • X.25ATMATM535Header48

  • ATM-UNIuser-network interface-NNInetwork-network interfaceATMATMATM


6-11 (a)UNIATM(b)NNIATM


6.5.4 ATM

1.ATM

  • ATM

  • ATMVP/VCVP/VC


2ATM

  • ATM6-12switching fabric


6-12 ATM


    • X.25

    • FR

    • ISDN

    • ATM


  • Login