通信工程专业英语 Unit 16：Frame Relay and ATM.ppt

1、专 业 英 语,Specialized English,Unit 16：,第二部分 通信技术,Frame Relay and ATM,NEW WORDS AND PHRASES,NEW WORDS AND PHRASES,As the speed and number of local area networks (LANs) continue their relentless growth, increasing demand is placed on wide area packet-switching networks to support the tremendous throughp

2、ut generated by these LANs. 全句可译为：“随着局域网（LAN）的速度和数量的无情增长，对广域分组交换网的要求也在提高，这些广域网用来处理局域网产生的巨大的吞吐量。” “to support the tremendous throughput generated by these LANs.”是不定式短语作目的状语。“generated by these LANs.”是分词短语作throughput的后置定语。,TEXT,Fortunately, several new generations of high-speed switched services for w

3、ide area networking have moved rapidly from research lab and the draft standard stage to the commercially available, standardized-product stage. 全句可译为：幸运的是，一些新生代的广域网高速交换业务（技术）已经迅速从实验室草图标准阶段进入到可商业化的、标准化产品阶段。,Although frame relay is a switched network technology, the frame relay protocol can be used o

4、ver a dedicated line to provide a convenient and flexible multiplexing technique. 全句可译为：“尽管帧中继是一种交换网技术，（但是）帧中继（也）可作为一种在专用线路上便捷、灵活的复用技术。”,Other issues that complicate the selection process include the difficulty of forecasting future traffic volumes by organizations with wide area networking requirem

5、ents, and difficulty in forecasting traffic distributions given the flexibility of applications and the mobility of users. 全句可译为：“使问题复杂化的其它问题包括：有组织的、随着广域网要求预测未来的通信量的困难以及假设性的、业务灵活性和用户的移动性预测通信量的分布。”,In X.25, multiple virtual circuits are carried on a single physical link, and the link-layer protocol provides reliable transmission from the source to the packet-switching network and from the packet-switching network to the destinat