Telecommunications stand for devices and systems that transmit electronic or optical signals across long distances. Telecommunications enables people around the world to contact one another, to access information instantly, and to communicate from remote areas. Telecommunications usually involves a sender of information and one or more recipients linked by a technology, such as a telephone system, that transmits information from one place to another. Telecommunications enables people to sand and receive personal messages across town, between countries, and to and from outer space. It also provides the key medium for delivering news, data, information, and entertainment.Telecommunications devices convert different types of information, such as sound and video, into electronic or optical signals. Electronic signals typically travel along a medium such as copper wire or are carried over the air as radio waves. Optical signals typically travel along a medium such as strands of glass fibers. When a signal reaches its destination, the device on the receiving end converts the signal back into an understandable message, such as sound over a telephone, moving images on a television, or words and pictures on a computer screen.Telecommunications messages can be sent in a variety of ways and by a wide range of devices. The messages can be seat from one sender to a single receiver (point-to-point) or from one sender to many receivers (point-to-multipoint). Personal communications, such as a telephone conversation between two people or a facsimile (fax) message (see Facsimile Transmission), usually involve point-to-point transmission. Point-to-multipoint telecommunications, often called broadcasts, provide the basis for commercial radio and television programming.Telecommunications begin with messages that are converted into electronic or optical signals. Some signals, such as those that carry voice or music, are created in an analog or wave format, but may be converted into a digital or mathematical format for faster and more efficient transmission. The signals are then sent over a medium to a receiver, where they are decoded back into a form. that the person receiving the message can understand. There are a variety of ways to create and decode signals, and many different ways to transmit signals.Individual people, businesses, and governments use many different types of telecommunications systems. Some systems, such as the telephone system, use a network of cables, wires, and switching stations for point-to-point communication. Other systems, such as radio and television, broadcast radio signals over the air that can be received by anyone who has a device to receive them. Some systems make use of several types of media to complete a transmission. For example, a telephone call may travel by means of copper wire, fiber-optic cable, and radio waves as the call is sent from sender to receiver. All telecommunications systems are constantly evolving as telecommunications technology improves. Many recent improvements, for example, offer high-speed broadband connections that are needed to send multimedia information over the Internet.Personal computers have pushed the limits of the telephone system as more and more complex computer messages are being sent over telephone lines, and at rapidly increasing speeds. This need for speed has encouraged the development of digital transmission technology. The growing use of personal computers for telecommunications has increased the need for innovations in fiber-optic technology.Telecommunications and information technologies are merging and converging. This means that many of the devices now associated with only one function may evolve into more versatile equipment. This convergence is already happening in various fields. Some telephones and pagers are able to store not only phone numbers but also names and personal information aboA.Current development.B.Transmission of message.C.Computer networking.D.Government regulation.

Telecommunications stand for devices and systems that transmit electronic or optical signals across long distances. Telecommunications enables people around the world to contact one another, to access information instantly, and to communicate from remote areas. Telecommunications usually involves a sender of information and one or more recipients linked by a technology, such as a telephone system, that transmits information from one place to another. Telecommunications enables people to sand and receive personal messages across town, between countries, and to and from outer space. It also provides the key medium for delivering news, data, information, and entertainment.

Telecommunications devices convert different types of information, such as sound and video, into electronic or optical signals. Electronic signals typically travel along a medium such as copper wire or are carried over the air as radio waves. Optical signals typically travel along a medium such as strands of glass fibers. When a signal reaches its destination, the device on the receiving end converts the signal back into an understandable message, such as sound over a telephone, moving images on a television, or words and pictures on a computer screen.

Telecommunications messages can be sent in a variety of ways and by a wide range of devices. The messages can be seat from one sender to a single receiver (point-to-point) or from one sender to many receivers (point-to-multipoint). Personal communications, such as a telephone conversation between two people or a facsimile (fax) message (see Facsimile Transmission), usually involve point-to-point transmission. Point-to-multipoint telecommunications, often called broadcasts, provide the basis for commercial radio and television programming.

Telecommunications begin with messages that are converted into electronic or optical signals. Some signals, such as those that carry voice or music, are created in an analog or wave format, but may be converted into a digital or mathematical format for faster and more efficient transmission. The signals are then sent over a medium to a receiver, where they are decoded back into a form. that the person receiving the message can understand. There are a variety of ways to create and decode signals, and many different ways to transmit signals.

Individual people, businesses, and governments use many different types of telecommunications systems. Some systems, such as the telephone system, use a network of cables, wires, and switching stations for point-to-point communication. Other systems, such as radio and television, broadcast radio signals over the air that can be received by anyone who has a device to receive them. Some systems make use of several types of media to complete a transmission. For example, a telephone call may travel by means of copper wire, fiber-optic cable, and radio waves as the call is sent from sender to receiver. All telecommunications systems are constantly evolving as telecommunications technology improves. Many recent improvements, for example, offer high-speed broadband connections that are needed to send multimedia information over the Internet.

Personal computers have pushed the limits of the telephone system as more and more complex computer messages are being sent over telephone lines, and at rapidly increasing speeds. This need for speed has encouraged the development of digital transmission technology. The growing use of personal computers for telecommunications has increased the need for innovations in fiber-optic technology.

Telecommunications and information technologies are merging and converging. This means that many of the devices now associated with only one function may evolve into more versatile equipment. This convergence is already happening in various fields. Some telephones and pagers are able to store not only phone numbers but also names and personal information abo

A.Current development.

B.Transmission of message.

C.Computer networking.

D.Government regulation.


相关考题:

● Your (75) is an electronic meeting place for your family, friends and potentially, for millions of people around the world.(75)A. computerB. websiteC. mailboxD. storage

According to the passage, ______ has become the driving force for the development of telephone system?A.information technologiesB.InternetC.PCD.convergence of telecommunications technologies

As a result of these advantages, optical fiber communication systems are widely employed for applications (96)major telecommunications backbone (97) to Ethernet systems, broadband distribution, and general data networking.A. including 包含 B. ranging from从。。。排列 C. consisting of由。。。组成 D. composing of 构成 A. structure 结构,体系 B. networking 网络化 C. infrastructure基础建设基础设施 D. connection 连接

With ______ you can communicate in real time with people all around the world.A.E-mailB.WWWC.FTPD.web chat

enables users to search,access,and download information from Internet()。A.E-MailB.OAC.WWWD.AI

With ( )you can communicate in real time with people all around the world.A. wed pageB. wed chatC. web siteD. E-Mail

People working together in an office used to ____________.A. talk more about handwritingB. take more notes on workdaysC. know better one another's handwritingD. communicate better with one another

Who is Art Wang?A.An employee with Imex Systems, Inc.B.A representative of InterspeedC.A reporter for the Lofton City HeraldD.A telecommunications expert

In ancient times wealth was measured and exchanged in things that could be touched:food,tools,and precious metals and stones.Then the barter system was replaced by coins,which Still had?real value since they were pieces of rare metal.Coins were followed by fiat money,paper notes that?have value only because everyone agrees to accept them.Today electronic monetary systems are gradually being introduced that will transform money into?even less tangible forms,reducing it to a series of"bits and bytes",or units of computerized.information,going between machines at the speed of light.′Already,electronic fund transfer allows money to be?instantly sent and received by different banks,companies,and countries?through computers and telecommunications devices.Which of the following statements about computerized monetary systems is NOT supported by the?passage?《》()A.They promote international trade.B.They allow very rapid money transfers,C.They are still limited to small transactions(交易).D.They are dependent on good telecommunications systems.

In ancient times wealth was measured and exchanged in things that could be touched:food,tools,and precious metals and stones.Then the barter system was replaced by coins,which Still had?real value since they were pieces of rare metal.Coins were followed by fiat money,paper notes that?have value only because everyone agrees to accept them.Today electronic monetary systems are gradually being introduced that will transform money into?even less tangible forms,reducing it to a series of"bits and bytes",or units of computerized.information,going between machines at the speed of light.′Already,electronic fund transfer allows money to be?instantly sent and received by different banks,companies,and countries?through computers and telecommunications devices.According to the passage,which of the following was the earliest kind Of exchange of wealth?《》()A.Bartered foods.B.Fiat money.C.Coin currency.D.Intangible forms.

In ancient times wealth was measured and exchanged in things that could be touched:food,tools,and precious metals and stones.Then the barter system was replaced by coins,which Still had?real value since they were pieces of rare metal.Coins were followed by fiat money,paper notes that?have value only because everyone agrees to accept them.Today electronic monetary systems are gradually being introduced that will transform money into?even less tangible forms,reducing it to a series of"bits and bytes",or units of computerized.information,going between machines at the speed of light.′Already,electronic fund transfer allows money to be?instantly sent and received by different banks,companies,and countries?through computers and telecommunications devices.According to the passage,coins once had real value as currency because they《》()A.represented a great improvement over barterB.permitted easy transportation of wealthC.were made of precious metalsD.could become collector's items

We have launched a campaign called Together Science Can,which brings together people from absolutely around the world to______for those things that we care about。A.stand byB.stand upC.stand onD.stand against

共用题干New Research Lights the Way to Super-fast Computers1. New research published today in the journal Nature Coniniunications,has demonstrated how glass can be manipulated to create a material that will allow computers to transfer information using light. This development could significantly increase computer processing speeds and power in the future.2. The research by the University of Surrey,in collaboration with the University of Cambridge and the University of Southampton,has found it is possible to change the electronic properties of amorphous chalcogenides,a glass material integral to data technologies such as CDs and DVDs. By using a technique called ion doping,the team of researchers have discovered a material that could use light to bring together different computing functions into one component,leading to all-optical systems.3. Computers currently use electrons to transfer information and process applications.On the other hand,data sources such as the Internet rely on optical systems:the transfer of information using light. Optical fibres are used to send information around the world at the speed of light,but these signals then have to be converted to electrical signal once they reach a computer,causing a significant slowdown in processing.4 .“The challenge is to find a single material that can effectively use and control light to carry information around a computer. Much like how the web uses light to deliver information,we want to use light to both deliver and process computer data,”said project leader,Dr. Richard Curry of the University of Surrey.5 .“This has eluded researchers for decades,but now we have shown how a widely used glass Call be manipulated to conduct negative electrons,as well as positive charges,creating what are known as‘pn-junction'devices. This should enable the material to act as a light source,a light guide and a light detecto—something that can carry and interpret optical information.In doing so,this could transform the computers of tomorrow,allowing them to effectively process infonna- tion at much faster speeds.”6. The researchers expect that the results of this research will be integrated into computers within ten years .In the short term,the glass is already being developed and used in next-generation computer memory technology known as CRAM,which may ultimately be integrated with the advances reported. Paragraph 3_________A: Expectation of the discoveryB:The problem of current computers.C:.A new findingD: The purpose of the researchE: Public reaction to the discoveryF: The use of the new material

共用题干New Research Lights the Way to Super-fast Computers1. New research published today in the journal Nature Coniniunications,has demonstrated how glass can be manipulated to create a material that will allow computers to transfer information using light. This development could significantly increase computer processing speeds and power in the future.2. The research by the University of Surrey,in collaboration with the University of Cambridge and the University of Southampton,has found it is possible to change the electronic properties of amorphous chalcogenides,a glass material integral to data technologies such as CDs and DVDs. By using a technique called ion doping,the team of researchers have discovered a material that could use light to bring together different computing functions into one component,leading to all-optical systems.3. Computers currently use electrons to transfer information and process applications.On the other hand,data sources such as the Internet rely on optical systems:the transfer of information using light. Optical fibres are used to send information around the world at the speed of light,but these signals then have to be converted to electrical signal once they reach a computer,causing a significant slowdown in processing.4 .“The challenge is to find a single material that can effectively use and control light to carry information around a computer. Much like how the web uses light to deliver information,we want to use light to both deliver and process computer data,”said project leader,Dr. Richard Curry of the University of Surrey.5 .“This has eluded researchers for decades,but now we have shown how a widely used glass Call be manipulated to conduct negative electrons,as well as positive charges,creating what are known as‘pn-junction'devices. This should enable the material to act as a light source,a light guide and a light detecto—something that can carry and interpret optical information.In doing so,this could transform the computers of tomorrow,allowing them to effectively process infonna- tion at much faster speeds.”6. The researchers expect that the results of this research will be integrated into computers within ten years .In the short term,the glass is already being developed and used in next-generation computer memory technology known as CRAM,which may ultimately be integrated with the advances reported. The result of the research can help computers to increase_________.A: optical informationB: processing speedsC: electronsD:positive chargesE: data technologiesF: all-optical systems

共用题干New Research Lights the Way to Super-fast Computers1. New research published today in the journal Nature Coniniunications,has demonstrated how glass can be manipulated to create a material that will allow computers to transfer information using light. This development could significantly increase computer processing speeds and power in the future.2. The research by the University of Surrey,in collaboration with the University of Cambridge and the University of Southampton,has found it is possible to change the electronic properties of amorphous chalcogenides,a glass material integral to data technologies such as CDs and DVDs. By using a technique called ion doping,the team of researchers have discovered a material that could use light to bring together different computing functions into one component,leading to all-optical systems.3. Computers currently use electrons to transfer information and process applications.On the other hand,data sources such as the Internet rely on optical systems:the transfer of information using light. Optical fibres are used to send information around the world at the speed of light,but these signals then have to be converted to electrical signal once they reach a computer,causing a significant slowdown in processing.4 .“The challenge is to find a single material that can effectively use and control light to carry information around a computer. Much like how the web uses light to deliver information,we want to use light to both deliver and process computer data,”said project leader,Dr. Richard Curry of the University of Surrey.5 .“This has eluded researchers for decades,but now we have shown how a widely used glass Call be manipulated to conduct negative electrons,as well as positive charges,creating what are known as‘pn-junction'devices. This should enable the material to act as a light source,a light guide and a light detecto—something that can carry and interpret optical information.In doing so,this could transform the computers of tomorrow,allowing them to effectively process infonna- tion at much faster speeds.”6. The researchers expect that the results of this research will be integrated into computers within ten years .In the short term,the glass is already being developed and used in next-generation computer memory technology known as CRAM,which may ultimately be integrated with the advances reported.Current computers transfer information using__________.A: optical informationB: processing speedsC: electronsD:positive chargesE: data technologiesF: all-optical systems

In many societies of the world, we find a large number of people who speak more than one language. As a characteristic of societies, b() inevitably results from the coming into contact of people with different cultures and different languages.

UMTS是()的缩写,即通用移动通信系统。A、Universal Mobile Telecommunications SystemB、UTRAN Mobile Telecommunications SystemC、Europe Mobile Telecommunications SystemD、Universal Mobile TeleSystem

Which capability do Cisco RFID-Ready Networks support?()A、 retrieval and processing of information for tagged terns across an enterpriseB、 access to enterprise networks from different service areasC、 standards-based communications for multiple media typesD、 extensive functionality for large enterprises primarily fitted with optical networking

What are three benefits of IF-MAP Federation?()A、Enables seamless access for remote access users to firewall enforcer protected resources.B、Scales a Junos Pulse Access control Service deployment beyond the capacity of a single cluster.C、Enables dynamic configuration synchronization across multiple MAG Series devices.D、Provides a substitute for WAN clustering among geographically separated MAG Series devices.E、Shares non-localized DP integration and IPsec configuration information between multiple Junos Pulse Access Control Service instances.

You have two database servers SEMP and SACCT. The database in the SEMP server maintains the employeeinformation and the database in the SACCT server maintains the accounts payable information. The employeessubmit the expense reports to the accounts payable department. A user of the accounts payable databasewants to extract the employee information from the database in the SEMP server for cross-verification.  Whichschema object enables the user to access the information from the remote database()A、ClusterB、Database linkC、Mapping tableD、Materialized view

You have two database servers SEMP and SACCT. The database in the SEMP server maintains theemployee information and the database in the SACCT server maintains the accounts payable  information.The employees submit the expense reports to the accounts payable department. A user of the accountspayable database wants to extract the employee information from the database in the SEMP server for cross-verification.  Which schema object enables the user to access the information from the remote database()A、ClusterB、Database linkC、Mapping tableD、Materialized view

单选题What is mentioned as a reason why the world market is being globalised?AThe developing countries can get goods and services from western countries only.BSome western multinationals are eager to reap profits from other countries.CThe developed countries depend more on resources of the developing countries.DThe world is becoming more connected through internet and telecommunications.

单选题()means a technique using digital codes which enables a radio station to establish contact with, and transfer information to another station or group of stations and complying with the relevant recommendations of the CCIR.ADSCBMSICEGCDNBDP

问答题Practice 7  While there are a few different conceptualizations of globalization, researchers seem to be in agreement that there are at least three dimensions of globalization: economic, political and cultural. The economic aspects of globalization stem from the spread of the capitalist world economy and the resulting expansion of goods and services. The need for cheap raw materials, cheap labor and new markets saw the expansion of the capitalist world economy from one that was primarily Eurocentric to one that encompassed the entire world. This process was achieved by various means and often involved overcoming political resistances in the new markets. The political aspects of globalization involved establishing control over markets and raw materials through either the use of direct military power or the establishment of international institutions that control such markets. The rise of the nation-state is an example of the political aspect of globalization, although it is argued that advances in telecommunications and information systems and the resulting constructions of institutions that transience territorial boundaries are making the nation-state obsolete.

多选题What are three benefits of IF-MAP Federation?()AEnables seamless access for remote access users to firewall enforcer protected resources.BScales a Junos Pulse Access control Service deployment beyond the capacity of a single cluster.CEnables dynamic configuration synchronization across multiple MAG Series devices.DProvides a substitute for WAN clustering among geographically separated MAG Series devices.EShares non-localized DP integration and IPsec configuration information between multiple Junos Pulse Access Control Service instances.

填空题In many societies of the world, we find a large number of people who speak more than one language. As a characteristic of societies, b() inevitably results from the coming into contact of people with different cultures and different languages.

单选题Which capability do Cisco RFID-Ready Networks support?()A retrieval and processing of information for tagged terns across an enterpriseB access to enterprise networks from different service areasC standards-based communications for multiple media typesD extensive functionality for large enterprises primarily fitted with optical networking