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with enhancements to existing equipment that were proprietary and expensive and did very little to raise customer awareness or engender trust in the vendor s migration strategy. Over time, however, PBX manufacturers began to embrace the concept of convergence as their customers demands for IP-based systems grew, and, soon, products began to appear. Most have heard the message delivered by the customer: Preserve the embedded base to the degree possible as a way of saving the existing investment; create a migration strategy that is seamless and as transparent as possible; and preserve the features and functions that customers are already familiar with to minimize churn. Major vendors like Lucent Technologies and Nortel Networks have responded with products that do exactly that. They allow voice calls and faxes to be carried over LAN, WANs, the Internet, and corporate intranets and function as both a gateway and gatekeeper, providing circuit-to-packet conversion, security, and access to a wide variety of applications; these include enhanced call features such as multiple line appearances, hunt groups, multiparty conferencing, call forward, hold, call transfer, and speed dial. They also provide access to voice mail, CTI applications, wireless interfaces, and call center features.

9.00M

One area that is often overlooked when companies look to improve the quality of the services they provide to their customers is billing. And while it is not typically viewed as a strategic competitive advantage, studies have shown that customers view it as one of the top considerations when assessing capability in a service provider. Billing offers the potential to strengthen customer relationships, improve long-term business health, cement customer loyalty, and generally make businesses more competitive. However, for billing to achieve its maximum benefit and strategic value, it must be fully integrated with a company s other operations support systems, including network and service provisioning systems, installation support, repair, network management, and sales and marketing. If done properly, the billing system becomes an integral component of a service suite that allows the service provider to quickly and efficiently introduce new and improved services in logical bundles; improve business indicators such as service timeliness, billing accuracy, and cost; offer custom service programs to individual

$1,887 $2,264 $2,717 $3,260 $3,912 $4,695 $5,633 $6,760 $8,112 $9,735

Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.

and compares it with the actual output voltage, V(19). This approach uses the same algorithm that we used to create the reference which stabilized the output voltage. The result is greatly improved regulation with respect to both line and load changes. The output voltage is now sensed by R8, R9, and C4. The purpose of C4 is to cancel one of the two poles of the output lter. The comparator, EB1, now compares the sine-wave reference to the output of the power stage rather than the output of the ip- op (V(7)), as in Fig. 7.7. The results are shown in Fig. 7.11. Note the drastic improvement in the dynamic transient response. The waveform is no longer highly distorted as a result of the transient. Also note that the spike that was created by the load switching is much smaller and recovers more quickly. The results also demonstrate the improved regulation against line changes. As in the previous circuit, the input voltage was simulated at 24 and 28 V. The improved circuit is useful in applications in which the output regulation and/or waveform are important. Powering Nonlinear Loads One of the greatest problems with DC-to-AC converters is the nonlinear load. The nonlinear load is often a recti er circuit, which may be found in most power supplies. A typical example is the power supply that is used in a personal computer. If the DC-to-AC converter is used as a UPS for a personal computer, it is likely that the power supply input circuit will contain a simple recti er and lter. The circuits in Fig. 7.12

3

$375 $450 $539 $647 $777 $932 $1,119 $1,342 $1,611 $1,933

customers based on individual service profiles; and transparently migrate from legacy service platforms to the so-called next generation network. In order for billing as a strategic service to work successfully, service providers must build a business plan and migration strategy that takes into account integration with existing operations support systems; business process interaction; the role of IT personnel and processes; and postimplementation testing to ensure compliance with strategic goals stipulated at the beginning of the project.

B1 V=(V(5)-V(7)) > 0 2.5 : -2.5

In addition to IP, VoIP relies on a superset of additional protocols to guarantee the level of rich functionality that users have come to expect. The relative importance of the protocols discussed in the sections that follow wax and wane like the stages of the moon, but all are important and readers should be familiar with them.

H.323