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…showed last 75 words of 857 total…on long hauls. Because of dense wave division multiplexing many of the older companies can get by on existing fiber. The bandwidth demand has been satisfied sufficiently. It has been proven to be a cost effective method with great benefits. DWDM based networks can carry different types of traffic at different speeds over an optical channel. From Quality of Service stand point, DWDM-based networks create a lower cost way to quickly respond to customers' bandwidth.