Integrated Services Digital Network (ISDN)

  • W. Buchanan


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.


Control Field Message Type Network Termination Address Field Information Frame 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Chapman & Hall 1996

Authors and Affiliations

  • W. Buchanan
    • 1
  1. 1.Department of EECENapier UniversityEdinburghUK

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