Abstract: A subscriber terminal installation for an asynchronous network, the installation having a subscriber digital termination comprising a switching matrix and access modules each connected firstly to the switching matrix and secondly to an asynchronous optical interface. One of the access modules is connected to a network digital termination, while each of the other access modules is connected either to a terminal or else to a terminal adapter. A processor connected to the module processes signalling received or to be transmitted via the access modules. A terminal adapter comprises a multiplex adapter, a service adapter specific to a particular service, and a control circuit. The multiplex adapter is connected via a two-way asynchronous optical interface to an access module and via an up interface and a down interface to the service adapter, the up and down interfaces being asynchronous interfaces conveying cells.

Abstract: A broadcast center delivers each program in digital form and assembles the digital signals of the programs to constitute a digital multiplex which is conveyed to reception points by radio links or by cables. A program is selected by searching for coinicidence between a user-specified number and a channel number in the digital multiplex. The receiver device comprises an input circuit (1), a synchronization word finding cirucit (2), a bit counter (4), a channel counter (5), a comparator (7), a keyboard (8), first (11) and second (10) registers, a parity check register (13), and a digital to analog converter (14).

Abstract: A multi-stage space-division switching network comprises groups of regenerators (RE1 to RE16) connected to input lines and to output lines of the switching network, it further includes groups of regenerators (RS1 to RS16) connected to a first end of intermediate links (LI1 to LI28) interconnecting two stages and groups of regenerators (R3.1 to R3.16) connected to the other ends of the intermediate links. A monitoring device comprises sampling devices (P) connected to the groups of regenerators and to a comparator circuit (CC). A main marker (MQP) receives connection instructions and sampling instructions and transmits these instructions to auxillary markers (MQ) which control the sampling circuits (P) and the switching circuits (C1, C2) of the switching network.