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Dịch vụ mạng thế hệ kế tiếp P2

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The Transmission Infrastructure We pass by transmission on the way to the Intelligent Network (IN) because it is important to understand how all the switching and signalling nodes (not to mention voice links) are connected together. Like the last chapter, we will pass briefly through analogue transmission first as a means of exposing the desires for digital transmission. Then move on to digitisation of speech and look at how large volumes of calls are economically carried across the world. Analogue voice signals can suffer from a number of interference problems ranging from degradation due to distance through to external signalling inducing...

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