电子与通信技术专业英语(第4版)Unit 3 lesson 15
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Wi-Fi uses radio networks to transmit data between its nodes. Such networks are made up of cells that provide coverage across the network. The more the number of cells, the greater and stronger is the coverage on the radio network. The most popular Wi-Fi technology such as 802.11b operates on the range of 2.40 GHz up to 2.4835 GHz band. This provides a comprehensive platform for operating Bluetooth strategy, cellular phones, and other scientific equipments. While 802.11a technology has the range of 5.725 GHz to 5.850 GHz and provides up to 54 Mbps in speed. 802.11g technology is even better as it covers three non-overlapping channels and allows PBCC.
FHSS (frequency-hopping spread spectrum)
跳频扩频
PCI（Peripheral Component Interconnect） 周边元件扩展接口
SSID (Service SLeabharlann Baidut Identifier) 服务集标识符
USB (Universal Serial Bus) 通用串行总线
Exercises
Translation
Vocabulary
Notes:
PART
1.Wireless Fidelity, popularly known as Wi-Fi, developed on IEEE 802.11 standards, is widely used technology advancement in wireless communi- cation. 译文：无线相容性认证，通常称为Wi-Fi ，它由IEEE 802.11标准发展而来，是 在无线通信中被广泛应用的先进技术。 IEEE：Institute Of Electrical And Electronics Engineers.USA美国电气与电子工程师协会 IEEE 802.11 standards：美国电气与电子工程师协会标准 2.Wi-Fi sets up numerous ways to build up a connection between the transmitter and the receiver such as DSSS, FHSS, IR – Infrared and OFDM. 译文：Wi-Fi在发射端和接收端之间设置了许多方法来建立连接，如扩频、跳频、红 外的连接和正交频分复用。 IR – Infrared ：Ir是红外线的意思，常用说法Ir接口，也就是红外线接口。
Device that can use Wi-Fi (such as a personal computer, video game console,
Text
New word
Notes
Exercises
Translation
Vocabulary
Lesson 15 Wireless Fidelity
Text
New word
Notes
Exercises
Translation
Vocabulary
New words and phrases:
PART
Phrases and Expressions
DSSS (direct sequence spread spectrum)
直接序列扩频
OFDM (Orthogonal Frequency Division Multiplexing)正交频分复用
Wi-Fi provides its users with the liberty of connecting to the Internet from any place such as their home, office or a public place without the hassles of plugging in the wires. Wi-Fi is quicker than the conventional modem for accessing information over a large network. With the help of different amplifiers, the users can easily change their location without disruption in their network access. Wi-Fi devices are compliant with each other to grant efficient access of information to the user. Wi-Fi location where the users can connect to the wireless network is called a Wi-Fi hotspot. Accessing a wireless network through a
Hotspot coverage can comprise an area as small as a single room with walls that block radio waves or as large as many square miles — this is achieved by using multiple overlapping access points (as shown in Fig.15-1).
Text
New word
Notes
Exercises
Translation
Vocabulary
Notes:
PART
USB：通用串行总线（Universal Serial Bus），是一新型界面规格，支持主系统与不同外设间的数据传输。 USB允许外设在开机状态下插拔使用，USB具有易于使用、高带宽、可接多达127个外设、数据传输稳定、 支持即时声音播放及影像压缩等特点。目前在国内市场可以见到的USB设备主要有扫描仪、数码相机、打 印机、集线器和外置存储设备等。 CardBus：PCMCIA推出的下一代高性能32位总线主控接口。它使现在只在桌面和较大系统上才拥有的高级 功能可以移入CardBus卡，从而可以用在移动环境下。 4.While 802.11a technology has the range of 5.725 GHz to 5.850 GHz and provides up to 54 Mbps in speed. 802.11g technology is even better as it covers three non-overlapping channels and allows PBCC. 译文：虽然802.11a技术有着5.725 GHz到5.850 GHz的范围，并可提供高达
Text
New word
Notes
Exercises
Translation
Vocabulary
Lesson 15 Wireless Fidelity
PART
hotspot in some cases is cost-free while in some it may carry additional charges. Many standard Wi-Fi devices such as PCI, miniPCI, USB, Cardbus and PC card, ExpressCard make the Wi-Fi experience convenient and pleasurable for the users.
CardBus 具有总线控制功能的32位PC卡
PBCC (Packet Broadcast Control Channel) 分组广播控制信道
mini PCI
内置型无线网卡
Express Card
扩展接口
Mbps (megabits per second) 兆比特/秒
Text
New word
Notes
Text
New word
Notes
Exercises
Translation
Vocabulary
Notes:
PART
3.Many standard Wi-Fi devices such as PCI, miniPCI, USB, Cardbus and PC card, ExpressCard make the Wi-Fi experience convenient and pleasurable for the users. 译文：许多标准的Wi-Fi设备，如PCI、miniPCI、USB、Cardbus以及PC卡、 ExpressCard使得用户的Wi-Fi体验方便而愉快。 PCI：PCI局部总线（Pedpherd Component Interconnect），一种由英特尔（Intel）公司1991年推出的用于定 义局部总线的标准。 PC card：PC卡，一种用以给电脑及其他通讯和电子设备添加诸如存储器、大容量存储器、网络及无线通信 等扩展装置的技术。 miniPCI：Mini PCI插槽也同样是在PCI的基础上发展起来的，Mini PCI的定义与PCI基本上一致，只是在外型 上进行了微缩。 Express Card：由PCMCIA联盟推出的新规格，其优点是体积更小，传输速度更快，更适合移动系统。
PART
Smartphone, tablet, or digital audio player) can connect to a network resource such as the Internet via a wireless network access point. Wi-Fi networks have limited range. A typical Wi-Fi home router using 802.11b or 802.11g might have a range of 45 m (150 ft) indoors and 90 m (300 ft) outdoors. Range also varies, as Wi-Fi is no exception to the physics of radio wave propagation, with frequency band. Wi-Fi in the 2.4 GHz frequency block has better range than Wi-Fi in the 5 GHz frequency block, and less range than the oldest Wi-Fi (and pre-Wi-Fi) 900 MHz block.
Lesson 15 Wireless Fidelity
PART
Wireless Fidelity, popularly known as Wi-Fi, developed on IEEE 802.11 standards, is widely used technology advancement in wireless communication. As the name indicates, Wi-Fi provides wireless access to applications and data across a radio network. Wi-Fi sets up numerous ways to build up a connection between the transmitter and the receiver such as DSSS, FHSS, IR – Infrared and OFDM.
FHSS (frequency-hopping spread spectrum)
跳频扩频
PCI（Peripheral Component Interconnect） 周边元件扩展接口
SSID (Service SLeabharlann Baidut Identifier) 服务集标识符
USB (Universal Serial Bus) 通用串行总线
Exercises
Translation
Vocabulary
Notes:
PART
1.Wireless Fidelity, popularly known as Wi-Fi, developed on IEEE 802.11 standards, is widely used technology advancement in wireless communi- cation. 译文：无线相容性认证，通常称为Wi-Fi ，它由IEEE 802.11标准发展而来，是 在无线通信中被广泛应用的先进技术。 IEEE：Institute Of Electrical And Electronics Engineers.USA美国电气与电子工程师协会 IEEE 802.11 standards：美国电气与电子工程师协会标准 2.Wi-Fi sets up numerous ways to build up a connection between the transmitter and the receiver such as DSSS, FHSS, IR – Infrared and OFDM. 译文：Wi-Fi在发射端和接收端之间设置了许多方法来建立连接，如扩频、跳频、红 外的连接和正交频分复用。 IR – Infrared ：Ir是红外线的意思，常用说法Ir接口，也就是红外线接口。
Device that can use Wi-Fi (such as a personal computer, video game console,
Text
New word
Notes
Exercises
Translation
Vocabulary
Lesson 15 Wireless Fidelity
Text
New word
Notes
Exercises
Translation
Vocabulary
New words and phrases:
PART
Phrases and Expressions
DSSS (direct sequence spread spectrum)
直接序列扩频
OFDM (Orthogonal Frequency Division Multiplexing)正交频分复用
Wi-Fi provides its users with the liberty of connecting to the Internet from any place such as their home, office or a public place without the hassles of plugging in the wires. Wi-Fi is quicker than the conventional modem for accessing information over a large network. With the help of different amplifiers, the users can easily change their location without disruption in their network access. Wi-Fi devices are compliant with each other to grant efficient access of information to the user. Wi-Fi location where the users can connect to the wireless network is called a Wi-Fi hotspot. Accessing a wireless network through a
Hotspot coverage can comprise an area as small as a single room with walls that block radio waves or as large as many square miles — this is achieved by using multiple overlapping access points (as shown in Fig.15-1).
Text
New word
Notes
Exercises
Translation
Vocabulary
Notes:
PART
USB：通用串行总线（Universal Serial Bus），是一新型界面规格，支持主系统与不同外设间的数据传输。 USB允许外设在开机状态下插拔使用，USB具有易于使用、高带宽、可接多达127个外设、数据传输稳定、 支持即时声音播放及影像压缩等特点。目前在国内市场可以见到的USB设备主要有扫描仪、数码相机、打 印机、集线器和外置存储设备等。 CardBus：PCMCIA推出的下一代高性能32位总线主控接口。它使现在只在桌面和较大系统上才拥有的高级 功能可以移入CardBus卡，从而可以用在移动环境下。 4.While 802.11a technology has the range of 5.725 GHz to 5.850 GHz and provides up to 54 Mbps in speed. 802.11g technology is even better as it covers three non-overlapping channels and allows PBCC. 译文：虽然802.11a技术有着5.725 GHz到5.850 GHz的范围，并可提供高达
Text
New word
Notes
Exercises
Translation
Vocabulary
Lesson 15 Wireless Fidelity
PART
hotspot in some cases is cost-free while in some it may carry additional charges. Many standard Wi-Fi devices such as PCI, miniPCI, USB, Cardbus and PC card, ExpressCard make the Wi-Fi experience convenient and pleasurable for the users.
CardBus 具有总线控制功能的32位PC卡
PBCC (Packet Broadcast Control Channel) 分组广播控制信道
mini PCI
内置型无线网卡
Express Card
扩展接口
Mbps (megabits per second) 兆比特/秒
Text
New word
Notes
Text
New word
Notes
Exercises
Translation
Vocabulary
Notes:
PART
3.Many standard Wi-Fi devices such as PCI, miniPCI, USB, Cardbus and PC card, ExpressCard make the Wi-Fi experience convenient and pleasurable for the users. 译文：许多标准的Wi-Fi设备，如PCI、miniPCI、USB、Cardbus以及PC卡、 ExpressCard使得用户的Wi-Fi体验方便而愉快。 PCI：PCI局部总线（Pedpherd Component Interconnect），一种由英特尔（Intel）公司1991年推出的用于定 义局部总线的标准。 PC card：PC卡，一种用以给电脑及其他通讯和电子设备添加诸如存储器、大容量存储器、网络及无线通信 等扩展装置的技术。 miniPCI：Mini PCI插槽也同样是在PCI的基础上发展起来的，Mini PCI的定义与PCI基本上一致，只是在外型 上进行了微缩。 Express Card：由PCMCIA联盟推出的新规格，其优点是体积更小，传输速度更快，更适合移动系统。
PART
Smartphone, tablet, or digital audio player) can connect to a network resource such as the Internet via a wireless network access point. Wi-Fi networks have limited range. A typical Wi-Fi home router using 802.11b or 802.11g might have a range of 45 m (150 ft) indoors and 90 m (300 ft) outdoors. Range also varies, as Wi-Fi is no exception to the physics of radio wave propagation, with frequency band. Wi-Fi in the 2.4 GHz frequency block has better range than Wi-Fi in the 5 GHz frequency block, and less range than the oldest Wi-Fi (and pre-Wi-Fi) 900 MHz block.
Lesson 15 Wireless Fidelity
PART
Wireless Fidelity, popularly known as Wi-Fi, developed on IEEE 802.11 standards, is widely used technology advancement in wireless communication. As the name indicates, Wi-Fi provides wireless access to applications and data across a radio network. Wi-Fi sets up numerous ways to build up a connection between the transmitter and the receiver such as DSSS, FHSS, IR – Infrared and OFDM.