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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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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 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

1ARDTE

(2BcTc


10

3BeTcBc4CIRTc(5) (Tc)Tc


Bc be
Bc Be

CBc+Be

Be

C=

C

Bc


10

CIRBcDE1DE1



10


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