Chapter 9 - Using telephoneand 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.
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.
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.
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)...
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,...
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.
(Dùng cho sinh viên hệ đào tạo đại học từ xa)
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!...
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
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.
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.
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.
Put your phone system on your computer network and see the savings
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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.
The DSX-3 is a common point in central offices or network nodes that provides the
• 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.
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.
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.
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.
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!