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Because of the large output capacitance associated with sourcing DC power, the isolation network may not require its own filter capacitor. The added inductor in combination with the PSE output filter capacitor, form the isolation network to keep the target circuitry from loading the RFA signal. As in the case of the audio amplifier output, it may be desirable to include the isolation network in the feedback loop of the output voltage regulator thereby minimizing the effect of the isolation network on the normal operation of the power sourcing equipment.
The distribution of products faces other challenges. For example, consumers want to choose products that have a particular set of functions or utility, and find it desirable to purchase products matched to their specific needs. Accordingly, manufacturers often manufacture a product in several difference models, with each model having a different set of features. Although this is desirable from the consumer's standpoint, it complicates the manufacturing, shipping, inventorying, shelving, and retailing processes. This problem exists in the configuration of electronic products, computers, gaming systems, DVDs, CDs, game cartridges, for example. For a specific example, a DVD movie disc may be available in a family version, a theater version, and an “uncut” version. Each has a different age restriction, and will appeal to different and significant markets. Accordingly, three different versions must be manufacture, shipped, inventoried, shelved, and managed. A similar problem exists with feature sets for games, computers, and other products.