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通信工程专业英语 Lesson 19 Guided Transmission Media 第19课 导向传输介质
邓 磊 (Some pictures are from the Internet) 东莞理工学院 电子工程与智能化学院 /31
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Outline Technical Contents Technical Terms Structures and Sentences
Twisted Pair 双绞线 Coaxial Cable 同轴电缆 Fiber Optic Cable 光缆 Comparison of Fiber Optics and Copper Wire 光纤和铜线的比较 Technical Terms Structures and Sentences
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Twisted Pair 双绞线 A Typical Category-5 UTP cable
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Twisted Pair for Ethernet Crossover Cable
Source : Wikipedia
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Twisted Pair 双绞线 MDI to MDI connection with Ethernet crossover cable
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Coaxial Cable 同轴电缆
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Fiber Optic Cable 光缆
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Fiber Optic Cable 光缆
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Comparison of Fiber Optics and Copper Wire 光纤和铜线的比较
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Technique Terms delay n. 延迟 insulate vt. 是绝缘 impedance n. 阻抗
insulation n. 绝缘 impedance n. 阻抗 conductor n. 导体 refraction n. 折射 reflection n. 反射 diffraction n. 衍射,绕射 photodiode n. 光敏二极管 impedance matching transformer 阻抗匹配变压器 multimode fiber 多模光纤 LED abbr. Light Emitting Diode 发光二极管
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Structures and Sentences
Coaxial cables used to be widely used within the telephone system for long-distance lines but have now largely been replaced by fiber optics on long-haul routes. 同轴电缆曾经广泛用于长途线路电话系统中。不过,如今大部分都被光纤替代了。
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Structures and Sentences
One thousand twisted pairs 1 km long weight 8000 kg. Two fibers have more capacity and weight only 100 kg, which greatly reduces the need for expensive mechanical support systems that must be maintained. 一公里长的1000对双绞线重达8000kg。然而,两根光纤就能拥有更多的容量,且重量只有100kg。这就大大减少了对必须维护的昂贵机械支持系统的需求。
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HW2 Reminder 英文写作作业2 发送电子版到邮箱:denglei@dgut.edu.cn
题目:The evolution of mobile communication system: from 1G to 5G 字数限制: 个单词 截止日期: , 23:59 (第11周周三) 电子版格式: PDF 电子版文件名: HW2_姓名_学号.pdf 邮件主题:HW2_姓名_学号 邮件主题请务必按此格式,否则无法收到自动回复
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Final Exam 期末考试时间 地点 2018年11月21日(12周周三)晚上19:00-21:00, 6E-306 (课头1)
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Thank You!
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