新视野大学英语第四册第四单元 ppt课件.ppt

The Telecommunications Revolution
Book 4, Unit 4
Text A
Proper names
telecommunications
optical fiber (L. 6) /high-capacity optical fiber links (L. 38)
cable (L. 7)
copper wire (L. 8)
digital switches (L. 8)/digital model (L. 22)/digital mobile phone systems (L. 51)
wireless transmission systems (L. 9)
the Information Age ()
a spider’s web of digital and wireless communication links (L. 11)
电信
光纤. 光学纤维/高容量的光纤电缆网
电缆
铜线（电缆）
数字转换器/数字模式/数字移动电话系统
无线传播系统
信息时代
一个蜘蛛网般的数字和无线通信网络
2
精品资料
3
你怎么称呼老师？
如果老师最后没有总结一节课的重点的难点，你是否会认为老师的教学方法需要改进？
你所经历的课堂，是讲座式还是讨论式？
教师的教鞭
“不怕太阳晒，也不怕那风雨狂，只怕先生骂我笨，没有学问无颜见爹娘 ……”
“太阳当空照，花儿对我笑，小鸟说早早早……”
4
Proper names
the information superhighway (L. 39)
log on (to)/ log out/off (L. 40)
the electronic data (L. 42) /electron (L. 73)
paperless trading (L. 43)
radio tower (L. 53)
string lines across mountain ridges (L. 53)
wireless call (L. 55)
fixed lines (L. 56)
信息高速公路
进入（计算机）系统；登录/退出
电子数据/电子（信号）
无纸化交易
无线电发射塔
翻山越岭架设线路
无线电话
固定线路
5
telephone & mobile phone
Internet and email
fax
radio
digital TV
satellite
Telecommunications
What telecommunications devices are available in your life? What does telecom mean to you?
6
Telecommunications
Telecommunications, from Greek, means “communications at a distance”.
The first trend: the incredible increase in the processing power of digital computers, namely, dramatic decreases in physical size, dramatic increases in complexity, speed and capacity.
The second trend: the explosive growth in transmission capacity through the widespread use of optical fiber across continents and under oceans.
7
optical fiber
Optical fiber (or “fiber optic”) often refers to the medium and the technology associated with the transmission of information as light pulses(光脉冲) along a glass or plastic wire or fiber. Optical fiber carries much more information than conventional copper wire and is in general not subject to electromagnetic电磁的 interference and the need to retransmit signal