Integrated Services Digital Network (ISDN)
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Chapter 10 shows that to encode speech digitally requires a bit-rate of 64 kbps. Most public telephone networks have now changed from analogue transmission to digital exchanges using PCM switching and transmission. The interface to many telephones is still analogue, as shown in Figure 11.1(a). Over the coming years this will change so that the speech is converted to digital data within the consumer’s equipment, as illustrated in Figure 11.1(b). The consumer’s equipment will also provide signalling information.
KeywordsControl Field Message Type Network Termination Address Field Information Frame
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