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The result of widespread softswitch deployment will be the creation of a switching model that does not have the same restrictions that plague circuit switches, such as intelligent network triggers, application invocation mechanisms and complex service logic This functional distribution will result in faster and more-targeted feature development and delivery and significantly lower service delivery costs Softswitches will be architecturally simpler, operationally efficient, and less expensive to operate and maintain A number of corporations have now focused their efforts on the development of softswitch products Both Lucent and Nortel announced softswitch products as early as 1999 in the form of the 7R/E (Lucent) and the Succession (Nortel) Today, they have been all but abandoned because the market simply wasn t ready to bridge the gap between the circuitswitched Bellheads and the IP bit-weenies, although both companies have now come roaring back into the fray with Succession (Nortel) and iMerge (Lucent).

Today, however, the market is once again growing, and ferociously Companies like Taqua Systems are beginning the process of reinvigorating the softswitch marketplace A key target sector is the small rural telephone company These companies are targets because they can take advantage of the incremental-deployment nature of the softswitch, and because they are one of the few segments that have money earmarked for capital growth Softswitch was originally intended as a local-switch replacement technology to facilitate the circuit-to-packet migration The economy, however, has been problematic, and progress has not been as aggressive as the sector would like In truth, softswitches have been used to replace.

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of 10 means that when one stock is up, the other stock is down A correlation coefficient of 00 indicates no meaningful relationship between the two assets Assets that are highly correlated offer less risk reduction from diversification than assets that are less correlated Coke and Pepsi are examples of two individual stocks that are highly correlated These two companies benefit and suffer from many of the same macro-economic forces An oil company and an airline company may experience negative correlation As oil prices go up the oil company benefits through increasing revenues, while the airline suffers because of fuel price increases and higher operating costs It is important to consider the correlation of assets when constructing a portfolio Achieving the highest return for each level of risk is known as investing efficiently investing on the efficient frontier.

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.

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.

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selected to form functional groupings, are what make data communications work properly Perhaps the best-known family of protocols is the International Organization for Standardization s Open Systems Interconnection Reference Model, usually called the OSI Model for the sake of simplicity Shown in Figure 2-11 and comprising seven layers, it provides a logical way to study and understand data communications and is based on the following simple rules First, each of the seven layers must perform a clearly defined set of responsibilities that are unique to that layer and guarantee the requirement of functional modularity Second, each layer depends upon the services of the layers above and below to do its own job, as we would expect, given the modular nature of the model Third, the layers have no idea how the layers around them do what they do; they simply know that they do it This is called transparency.

Efficient frontiers are portfolios that are designed with the help of computer modeling and are beyond the scope of this book This type of investing is normally accomplished by investing in different asset classes The most general asset classes for stocks are value and growth stocks, and large and small capitalization stocks If you have decided to increase your expected return on your assets by investing a portion of your portfolio in common stock, how should you diversify to reduce your risk Stockholders face two types of risk: systematic risk and unsystematic risk Systematic risk represents the risk of the stock market Changes in stock prices are caused by changes in the economy, taxes, and other market factors When these factors change, it affects the entire market Although systematic changes in the market affect each stock to a different degree, all stocks are impacted.