Data Communications and Networking Forouzan Fourth Edition Chapter 18 虚电路网络： 帧中继和ATM 18.1 Copyright The McGraw-Hill Companies,Inc.Permission required for reproduction or display
18.1 Chapter 18 虚电路网络: 帧中继和ATM Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display
18-1 帧中继 帧中继(Frame Relay)是一种虚电路广域网，设计用 来满足在20世纪80年代末期到90年代早期对新型广 域网的需求 Topics discussed in this section: 体系结构Architecture 帧中继层Frame Relay Layers 扩展地址Extended Address 帧中继组装器/分解器FRAD(Frame Relay assembler//disassemble) 帧中继语音VOFR(Voice Over Frame Relay) 本地管理信息LMI(Local management information) 18.2
18.2 18-1 帧中继 帧中继(Frame Relay)是一种虚电路广域网, 设计用 来满足在20世纪80年代末期到90年代早期对新型广 域网的需求. 体系结构 Architecture 帧中继层 Frame Relay Layers 扩展地址 Extended Address 帧中继组装器/分解器 FRAD (Frame Relay assembler/disassemble) 帧中继语音 VOFR (Voice Over Frame Relay) 本地管理信息 LMI (Local management information) Topics discussed in this section:
Figure18.1帧中继网络 旱旱旱 LAN ≤Router To the rest of Frame Relay network the Internet (WAN) × Router 18.3
18.3 Figure 18.1 帧中继网络
Note 帧中继中的VC称为DLCI. Vc:虚电路标识符(virtual circuit identifier) DLC:数字链路连接标识符(data link connection identifier) 18.4
18.4 帧中继中的VCI称为DLCI. Note VCI: 虚电路标识符 (virtual circuit identifier) DLCI: 数字链路连接标识符 (data link connection identifier)
Figure18.2帧中继层 Simplified core functions of data link layer Data link ANSI standards Physical 18.5
18.5 Figure 18.2 帧中继层