《專業(yè)英語(yǔ)》主要語(yǔ)法現(xiàn)象 UNIT 1 A Brief History of Communications 通信簡(jiǎn)史 UNIT 2 Analog Signals 模擬信號(hào) UNIT 3 Digital Signals 數(shù)字信號(hào) UNIT 4 Analog-to-Digital Encoding 模數(shù)編碼 UNIT 5 Digital Data Transmission 數(shù)字?jǐn)?shù)據(jù)傳輸 UNIT 6 Time-Division Multiplexing 時(shí)分復(fù)用 UNIT 7 Optical Fiber 光纖 UNIT 8 Synchronous Digital Hierarchy 同步數(shù)字系列 UNIT 9 Telephone System 電話系統(tǒng) UNIT 10 Cellular Mobile Telephony 蜂窩式移動(dòng)電話 UNIT 11 Microwave and Satellite Communications 微波與衛(wèi)星通信 UNIT 12 Introduction to Computer Networks 計(jì)算機(jī)網(wǎng)絡(luò)介紹 UNIT 13 The OSI Model OSI模型 UNIT 14 Ethernet 以太網(wǎng) UNIT 15 Packet Switching 分組交換 UNIT 16 Networking Devices within OSI Model OSI模型中的聯(lián)網(wǎng)部件 UNIT 17 Intr ODUCTION TO TCP/IP TCP/IP簡(jiǎn)介 UNIT 18 Internet 互聯(lián)網(wǎng)