General organization of a telephone network
Commutation téléphonique

Figure 4 summarizes the constitution of a communication chain.

• The distribution network provides the means to connect the subscriber station or installation to the PABX. Depending on subscriber dispersion and traffic, concentrators or remote units can be used to perform this function in the distribution network. It's worth noting the role played by the input splitter in shuffling lines according to changes and balancing traffic at the exchange's input.

  Numerous studies are underway to introduce fiber optics into the distribution network. To enable groups of subscribers to be connected via 2,048...