CARRIER GRADE VOICE OVER IP McGraw-Hill Telecommunications Ali Ash Azzam Azzam/Ransom Bartlett Bates Bayer Bedell Cla. Source: Carrier Grade Voice Over IPCHAPTER1IntroductionDownloaded from Digital Engineering Library @ McGraw-Hil. Richard Swale; Daniel Collins,. ISBN: Carrier-Grade VoIP, Third Edition, shows how to set up and administer a highly reliable, unified communications.
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Carrier Grade Voice Over IP, Third Edition ebook by Richard Swale,Daniel Collins. Preview . Wireless Networks ebook by Daniel Collins, Clint Smith. Wireless. Read and Download Ebook READ Carrier Grade Voice Over IP, Third Edition PDF Grade Voice Over IP, Third Edition by by By Richard Swale, Daniel Collins . resspocobarte.gq: Carrier Grade Voice Over IP, Third Edition (): Richard Swale, Daniel Collins, a year veteran of the wireless communications industry, Get your site here, or download a FREE site Reading App.
Carrier Grade Voice Over IP (E-Book, PDF)
However, it is important to note that VoIP does not automatically imply voice over the Internet. The Internet is a collection of interconnected networks, all using IP. The connections between these networks are used by anyone and everyone for a wide range of applications, from e-mail to file transfer to electronic commerce e-commerce. As we shall see later, one of the greatest challenges to VoIP is voice quality and one of the keys to acceptable voice quality is bandwidth.
If we are to ensure that sufficient bandwidth is available to enable high-quality voice, then we need to control and prioritize access to the available bandwidth. Currently, that does not happen on the Internet.
In fact, each user of the Internet is at the mercy of all other users. As a result, voice quality over the Internet today may vary from acceptable to atrocious. Introduction Chapter 1 4 All is not lost, however. The Internet is changing rapidly in terms of its size, the number of users, and the technology that it uses.
As technology changes and as more and more bandwidth is made available, it is possible that high-quality voice over the Internet may become the norm rather than the exception.
However, that day is still not at hand.
Consequently, while the term carrier-grade VoIP may not be an oxymoron, the term carriergrade voice over the Internet may well be. However, within this book, when we refer to VoIP, we generally exclude Internet telephony.
We shall see that high voice quality in IP networks requires the use of managed networks, QoS solutions, and service-level agreements SLAs between providers. In the meantime, a significant opportunity is available to deploy VoIP in networks where access and bandwidth are better managed.
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One such environment is that of next-generation Telcos, those companies building telephone networks using VoIP from the outset and posing a challenge to traditional carriers. This means that traffic is broken into small packets that are sent individually to their destination.
In the absence of special technical solutions, the route that each packet takes to its destination is determined independently at each network node on a packet-bypacket basis. IP is not the only packet-based protocol in existence. However, it is by far the most successful.
The explosive growth of the Internet proves this. IP itself provides no guarantees. For example, it is possible for different packets to take different routes from the origination point to the destination point, leading to the possibility of packets arriving at a destination in a different order than originally sent.
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Not only can packets arrive out of sequence, but some packets might not arrive at all or might be severely delayed. To combat these shortcomings, other protocols have been developed to operate in conjunction with IP to ensure that packets are delivered to their ultimate destination in the correct sequence and without loss.
Introduction Introduction 5 lost or delayed and the assembly of packets in the correct order at the destination end. Although the mechanisms used by TCP are appropriate and successful for data transfer such as file transfers and e-mail , they are not appropriate for the delivery of voice traffic. Most data traffic is asynchronous and extremely error sensitive.
For example, it hardly matters if an e-mail message takes 10 seconds or 30 seconds to reach its destination, but it is critical that every bit is received correctly. On the other hand, voice traffic is synchronous in nature and a little more tolerant of errors.
In speech, when someone speaks, the listener should hear it practically immediately, although it is not as critical that every millisecond of speech is heard.
Given that IP provides no guarantees regarding the efficient transport of data packets, one wonders why IP would even be considered as a means for transporting voice, particularly with the stringent delay requirements that voice imposes. One also wonders how VoIP can be made to match the quality, reliability, and scalability of traditional networks.
After all, if VoIP is to be a successful competitor to traditional telephony technology, then it must meet all the requirements met by traditional telephony, it must offer new and attractive capabilities beyond traditional telephony, and it must do so at a lower cost. Why VoIP? It is probably best to break this question into two parts.
The first is, why worry about carrying voice at all when a large and lucrative market for data services exists? The second question is, assuming that a carrier intends to compete in the voice market, why should IP be considered the transport mechanism?
Why Carry Voice? IP and the Internet have led to many new and exciting services.
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To my wife, Ann, my inspiration. The trip to Galveston was worth it.
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To my wonderful parents: If everyone had parents like mine, the world would be a much better place. Happy birthday, Dad. This page intentionally left blank. For more information regarding this title, click here. Why Carry Voice?Happy birthday, Dad. McGraw-Hill eBooks are available at special quantity discounts to use as premiums and sales promotions, or for use in corporate training programs.
That is, VoIP is a serious alternative to the circuit-switched telephony that we have known for decades. You may use the work for your own noncommercial and personal use; any other use of the work is strictly prohibited.
The technology has led to new revenue opportunities and to the creation of companies and enterprises to capitalize on those opportunities.