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.
第1题:
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
第2题:
enables users to search,access,and download information from Internet()。
A.E-Mail
B.OA
C.WWW
D.AI
第3题:
● Your (75) is an electronic meeting place for your family, friends and potentially, for millions of people around the world.
(75)
A. computer
B. website
C. mailbox
D. storage
第4题:
第5题:
People working together in an office used to ____________.
A. talk more about handwriting
B. take more notes on workdays
C. know better one another's handwriting
D. communicate better with one another
第6题:
With ______ you can communicate in real time with people all around the world.
A.E-mail
B.WWW
C.FTP
D.web chat
第7题:
With ( )you can communicate in real time with people all around the world.
A. wed pageB. wed chatC. web siteD. E-Mail
第8题:
According to the passage, ______ has become the driving force for the development of telephone system?
A.information technologies
B.Internet
C.PC
D.convergence of telecommunications technologies
第9题:
第10题: