Communication telephone communication

Xem 1-20 trên 115 kết quả Communication telephone communication
  • The telephone system remains as the backbone of low-cost telecommunications services in North America. An understanding of the telephone system is necessary when considering its use for data communications. Telephone: invented in 1874 by Alexander Graham Bell and patented in 1876 Single wire: In the beginning, the market was for telephones only. It is the customer who used to wire them between telephones using single wires and the earth as the ground or the other conductor to complete the circuit. ...

    pdf6p doxuan 13-07-2009 143 24   Download

  • Communications is a process by which information is exchanged between individuals through a common system of symbols, signs, or behaviour “It is about communication between people; the rest is technology” Communication systems are reliable, economical and efficient means of communications Public switched telephone network (PSTN), mobile telephone communication (GSM, 3G, 4G...), broadcast radio or television, navigation systems, ... The course is aiming at introducing fundamental issues required for understanding and designing a (digital) communication system...

    ppt28p doanhung_dtvtk10 24-03-2013 42 6   Download

  • The last decade proved to be hugely successful for the mobile communications industry, characterised by continued and rapid growth in demand, spurred on by new technological advances and innovative marketing techniques. Of course, when we refer to mobile communications, we tend to implicitly refer to cellular systems, such as GSM. The plight of the mobile-satellite industry over the last decade, although eventful, has, at times, been more akin to an out of control roller coaster ride.

    pdf382p nguyenthucanh 03-05-2010 140 62   Download

  • For example, communicating between two PCs via a telephone line (connected between subscriber's home and local office, then between local offices, and finally between local office and another subscriber's home). The telephone line is an analog system. That means it can not be used for digital transmission. If we try to transmit digital signals over the analog system, our bit rate or bandwidth will be limited to a minimum. On a 4 kHz analog band limited system we can only transmit at a maximum rate of roughly 1 kHz. Because a 1 kHz digital signal needs a bandwidth of 5...

    pdf6p doxuan 13-07-2009 119 27   Download

  • This course is about a communication system which is used to transfer information from a source to a destination. Examples of communication systems are telephones, wireless data access, television and many others.How to transmit the information from a source to a destination. How to evaluate the quality of the received information. What kinds of design goals to consider for a specific application. How to trade-off between various parameters (such as bandwidth and power) due to the design limitations and goals.

    pdf30p huemanvdoc 23-11-2009 100 18   Download

  • Cellular telephony is designed to provide communications between two moving units, called mobile stations (MSs), or between one mobile unit and one stationary unit, often called a land unit.

    ppt37p trada85 22-01-2013 22 5   Download

  • Communication Systems Lecturer: M.E. P.T.A. Quang .Contents           Chapter 1: Introductory Concepts Chapter 2: QoS Chapter 3: Transmission and switching Chapter 4: Digital networks Chapter 5: Signaling Chapter 6: PSTN Chapter 7: VoIP Chapter 8: Mobile communication Chapter 9: Satellite communication Chapter 10: Fiber-optic communication .

    pdf20p vanmanh1008 24-06-2013 35 5   Download

  • Chapter 9 - Using telephone and cable networks for data transmission. This chapter shows how the issues discussed in the previous chapters can be used in actual networks. In this chapter, we first discuss the telephone network as designed to carry voice. We then show how it can be used to carry data. Second, we discuss the cable network as a television network. We then show how it can also be used to carry data.

    ppt37p tangtuy04 12-03-2016 6 1   Download

  • English for Business Communication is a short course for people in or preparing for work who need to improve their English in these key areas: socialising, telephoning, presenting, taking part in meetings and negotiating. With its modular approach it is easy to fit into any teaching programme. As the title suggests, the focus is on developing speaking skills in the contexts of day-to-day dealings with customers, clients and suppliers of services or goods. Great emphasis is also placed on developing listening skills.

    pdf0p pepitaperez 03-10-2012 379 248   Download

  • ANALOGUE AND DIGITAL NETWORKS Digital technology in the telephone network is nothing new. Take all the relays in older exchanges as an example. Relays are either "off" or "on", and there is no state in between these. Suitable combinations of relays could build up and "remember" numbers - perhaps a far-fetched example, but in was digital, so it will serve!

    pdf86p truongbao 28-07-2009 638 240   Download

  • Praise for Conversations for Change "must read for anyone in business, government, or academia. The lessons she taught all too often for granted. This work distilled a lifetime of experience easy to understand action can bring benefits to all of us "- Joseph main, president and CEO, Bank of Victory" conversations that you have with your colleagues, your boss, various team, and even meaning itself. If not, then it is time to change the conversation.

    pdf252p kdo_1024 09-11-2011 251 172   Download

  • Thuật ngữ Viễn Thông (télécommunication) được ghép từ từ communication (liên lạc) với prefix tele (có nghĩa là xa). Edouard ESTAUNIE chính là người đưa ra thuật ngữ telecommunication vào năm 1904. Thời bấy giờ từ telecommunication dùng để chỉ telegraph và telephone.

    doc7p lehieukutek 26-12-2009 270 140   Download

  • Exercise 1. Read the following passage then answer the questions. ANALOGUE AND DIGITAL NETWORKS Digital technology in the telephone network is nothing new. Take all the relays in older exchanges as an example. Relays are either "off" or "on", and there is no state in between these. Suitable combinations of relays could build up and "remember" numbers - perhaps a far-fetched example, but in was digital, so it will serve! What is new is the transfer of speech digitally. In other words, the sound we make when we speak is converted to digits and sent out on to the network....

    pdf86p longmontran 15-01-2010 176 122   Download

  • Thuật ngữ Viễn Thông (télécommunication) được ghép từ từ communication (liên lạc) với prefix tele (có nghĩa là xa). Edouard ESTAUNIE chính là người đưa ra thuật ngữ telecommunication vào năm 1904. Thời bấy giờ từ telecommunication dùng để chỉ telegraph và telephone.

    pdf12p thanhfnt 01-04-2010 282 112   Download

  • The third generation (3G) mobile communication system is the next big thing in the world of mobile telecommunications. The first generation included analog mobile phones [e.g., Total Access Communications Systems (TACS), Nordic Mobile Telephone (NMT), and Advanced Mobile Phone Service (AMPS)], and the second generation (2G) included digital mobile phones [e.g., global system for mobile communications (GSM), personal digital cellular (PDC), and digital AMPS (D-AMPS)].

    pdf568p nhq_khtn 12-03-2011 101 40   Download

  • The use of satellites in communications systems is very much a fact of everyday life, as is evidenced by the many homes equipped with antennas, or dishes used for reception of satellite television. What may not be so well known is that satellites form an essential part of telecommunication systems worldwide, carrying large amounts of data and telephone traffic in addition to the television signals.

    pdf206p ktcn_1 10-07-2012 31 9   Download

  • Wireless communication slowly is becoming reality. In a wireless world, a printer is installed automatically after it is turned on; keyboard and mouse cables no longer become hopelessly tangled; Palm Pilots and mobile telephones automatically synchronize and communicate. Providing this sort of seamless, wireless communication--at a low cost--is the goal of Bluetooth technology. Devices that support Bluetooth automatically communicate with one another when they come within a 30-foot range of each other.

    pdf406p transang5 23-11-2012 30 9   Download

  • The book presents all of the situations you may encounter in business negotiations with the Japanese partners daily, help you confident in any situations. This book includes 10 chapters, including communication to meet for the first time and situations to customers over the phone, ask and someone etc. The book is divided into 2 parts, the following is part 1 with the first 4 chapters of the book.

    pdf100p kiepnaybinhyen_02 04-12-2015 88 13   Download

  • As the growing demand formobile communications is constantly increasing, the need for better coverage, improved capacity and higher transmission quality rises. Thus, a more efficient use of the radio spectrum is required. Smart antenna systems are capable of efficiently utilizing the radio spectrum and, thus, is a promise for an effective solution to the present wireless systems’ problems while achieving reliable and robust high-speed high-data-rate transmission. The purpose of this book is to provide the reader a broad viewof the systemaspects of smart antennas.

    pdf180p kuckucucu 15-05-2012 52 10   Download

  • SIGNAL PROCESSING IN THE TELEPHONE SYSTEM Until the introduction of the digital telephone, there was virtually no signal processing on the subscriber loop. Indeed, there was no need for it. The majority of subscriber loops were able to transmit voice signals with no particular difficulty and in cases where the lines were longer than usual, line ‘‘loading’’ was used with success. Signal processing has two major aims: (1) To improve the quality of signal transmission over the telephone communication channels....

    pdf37p tienvovan 11-09-2010 51 7   Download

CHỦ ĐỀ BẠN MUỐN TÌM

Đồng bộ tài khoản