1. General

1.1 Multiplexing in access networks

The main role of an access network is to collect the signals emitted by subscribers to the various telecommunication services and route them to a local center, where they are routed to the appropriate service network. In its most general form, a multiservice access network can be diagrammed as shown in figure 1 :

The access network aggregates the various, generally low-speed subscriber flows to higher-speed arteries for connection to service networks such as the switched telephone network, ISDN (integrated services digital network) or dedicated link networks such as Transmic. Grouping is carried out as soon as possible, with the aim of sharing...