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第 10 章 帧中继 PowerPoint PPT Presentation


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第 10 章 帧中继. 本章重点 为什么会提出帧中继技术。 帧中继提高传输速率的主要机理。 帧中继协议的结构。 帧中继虚电路连接的工作原理。 帧中继的业务参数和服务质量。. 第 10 章 帧中继. 10.1 概述 帧中继: Frame Relay 简称 FR 局域网( LAN )通过广域网( WAN )进行互联,要求广域网提供高带宽、高传输率。 帧中继是上世纪 90 年代诞生的新型分组交换网,是一种快速分组交换网,它提供高吞吐率和低时延的动态带宽分配,性能远胜于原有的 X.25 分组交换网。. 10.1.1 帧中继的引入.

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第 10 章 帧中继

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10

10


10


10

10

10.1

Frame Relay FR

LANWAN

90X.25


10 1 1

10.1.1

1 .

LAN


10

2. Bust


10

3.

X.25


10


10


10


10

4.


10 1 2

10.1.2


10 1 4

10.1.4

I.122

I.233

I.370

I.372

I.555

I.620

Q.922Q933X.36X.76


10

10.2

10.2.1 ISDN

ITU-TISDNDX.25X.25

LAPDLink Access Procedure for D channel

LAPF Link Access Procedure for Frame-Mode Bearer ServiceQ.922


10

ISDN

OSI

Q.933

Q.933

3

LAPD

LAPD

2

LAPF Core

LAPF Core

I.430/I.431

I.430/I.431

1

TE

NT


10

LAPF

  • LAPF


10


10 2 2

10.2.2

10.3.3

Virtual CircuitVCData Link ConnectionDLC

DLC Data Link Connection IdentifierDLCI


Permanent vc pvc switched vc svc svc

Permanent VCPVCSwitched VCSVCSVC


10


10 2 3

10.2.3


10

1ARDTE

(2BcTc


10

3BeTcBc4CIRTc(5) (Tc)Tc


Bc be

BcBe

CBc+Be

Be

C=

C

Bc


10

CIRBcDE1DE1


10 2 4

10.2.4


10


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