Xem 1-20 trên 122 kết quả Telephone networks
  • 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.

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  • This limited edition of VoIP Security For Dummies shows how risks are identified, analyzed, managed, and minimized in your converged voice and data networks. Find out how security best practices can make your VoIP network as secure as a traditional telephone network.

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  • Tham khảo tài liệu 'telephony - chapter 2: subscriber access to the telephone network', kỹ thuật - công nghệ, kĩ thuật viễn thông phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • Telephone networks use circuit switching. The telephone network had its beginnings in the late 1800s. The entire network, which is referred to as the plain old telephone system (POTS), was originally an analog system using analog signals to transmit voice.

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  • The generic cellular communication system, shown in Fig.l, is an integrated network comprising a land base wire line telephone network and a composite wired-wireless network. The land base network is the traditional telephone system in which all telephone subscribers are connected to a central switching network, commonly known as PSTN (Public Switching Telephone Network). It is a digital switching system, providing: i) Switching, ii) Billing, iii) 911 dialing, iv)l-800 and 1-900 calling features, v)...

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  • This chapter includes contents: Types of remote network connections, public switched telephone network (PSTN), modems, modem communications, configuring a modem, Virtual Private Network (VPN) communications,...

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  • Chapter 12 - Remote network access. This chapter includes contents: Types of remote network connections, public switched telephone network (PSTN), modems, modem communications, configuring a modem, Virtual Private Network (VPN) communications,...

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  • Telecommunications is now the fastest changing part of the IT industry, encompassing vast disciplines from distributed systems to real-time applications. I have had the pleasure of being involved in what I believe is the most exciting time in its history. It wasn’t always this way, as telecommunications started out as a novelty: ‘‘An amazing invention, but who would want to use one?’’ – US President Rutherford B. Hayes after making a telephone call from Washington D.C. to Philadelphia. Interestingly however, in 1879, the first telephone was installed in the White House.

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  • (Dùng cho sinh viên hệ đào tạo đại học từ xa) UNIT 1 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!...

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  • Telecommunications is one of the fastest growing business sectors of modern information technologies. A couple of decades ago, to have a basic understanding of telecommunications, it was enough to know how the telephone network operated. Today, the field of telecommunications encompasses a vast variety of modern technologies and services. Some services, such as the fixed telephone service in developed countries, have become mature, and some have been exploding (e.g., cellular mobile communications and the Internet).

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  • This white paper provides a brief tutorial on Ethernet – a family of standards that defines several well-established 10 Mbps networking technologies and three newer, high-speed offerings, Fast Ethernet, Gigabit Ethernet, and 10 Gigabit Ethernet. It is intended for carrier network professionals, experts in the circuitswitched technologies employed in public switched telephone networks (PSTN) but often new to Ethernet and data networking.

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  • Before the advent of virtual private network (VPN) technology, remote connections were usually through expensive dedicated lines, or smaller organizations may have used on-demand connection technologies such as dial-up over Integrated Services Digital Network (ISDN) or Public Switched Telephone Network (PSTN). VPN has allowed companies to shift their connections to the Internet and save money, but still provide confidentiality and integrity to their communication traffic. Branch offices can be located on the other side of the city or scattered across a continent.

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  • The Personal Communication Services (PCS) network is a digital network that has the same basic components and standards as cellular networks. A PCS network consists of a mobile switching center, base station transceivers or cell sites, and base station controllers connected to a network service provider. The mobile switching center typically handles 100,000 subscribers. It connects the radio network to the service provider’s telephone network.

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  • Put your phone system on your computer network and see the savings See how to get started with VoIP, how it works, and why it saves you money VoIP is techspeak for "voice over Internet protocol," but it could spell "saving big bucks" for your business! Here's where to get the scoop in plain English. Find out how VoIP can save you money, how voice communication travels online, and how to choose the best way to integrate your phone system with your network at home or at the office.

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  • SoftSwitch LP1 Telephone interface Box

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  • The DSX-3 is a common point in central offices or network nodes that provides the following functions: • Termination of a variety of equipment referred to as network elements (NE). The NE are permanently cabled to this common point during the initial installation and remain terminated at the DSX-3 for the life of the equipment. • Cross-connection of two NE together to configure a circuit. The cross-connect jumper is a semi-permanent connection that may be changed as the telephone network evolves and circuits are re-configured to meet service demands.

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  • Chapter 7 objectives: Identify a variety of uses for WANs; explain different WAN topologies, including their advantages and disadvantages; compare the characteristics of WAN technologies, including their switching type, throughput, media, security, and reliability;... Inviting you to refer.

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  • We discussed wireless LANs in chapter 14. Wireless technology is also used in cellular telephony and satellite networks. We discuss the former in this chapter as well as examples of channelization access methods (see Chapter 12). We also briefly discuss satellite networks, a technology that eventually will be linked to cellular telephony to access the Internet directly.

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  • Chapter 8 - Telephone and cable TV networks: Residential connection to the internet. After reading this chapter, the reader should: Understand the structure of the telephone network, understand the services provided by the telephone network and how these services allow us to connect to the Internet, understand the structure of the cable TV network, understand the services provided by the cable TV network and how these services allow us to connect to the Internet.

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  • Chapter 25 - Multimedia. Recent advances in technology have changed our use of audio and video. In the past, we listened to an audio broadcast through a radio and watched a video program broadcast through a TV. We used the telephone network to interactively communicate with another party. But times have changed. People want to use the Internet not only for text and image communications, but also for audio and video services. In this chapter, we concentrate on applications that use the Internet for audio and video services.

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