Abstract: The equipment consists of one or more voice units (U1 . . . Un) each connected to a certain number of independent lines (E1 . . . En) connected to a telephone network (RT). Each unit presents an announcement data base (AA1 . . . AAn) which contains all possible announcements to be supplied to the subscribers, a computer (EL1 . . . ELn) which manages the research of an announcement in the data base (AA1 . . . AAn) and its sending to the subscribers (UT1 . . . UTx) and an interface (IEC1 . . . IECn) towards the network (RT) for the temporary storage of the announcements or part of them before the sending, the processing of the telephone signalling, the possible conversion into analog form, and the equipment supervision.

Abstract: A line identifier at a telecommunication switchboard comprises a matrix of magnetic-induction elements serving as current sensors for detecting a request for establishing a connection between a selected incoming line and a selected outgoing line. The sensors are connected to a multiplexer for providing samples in a time-division mode to a logic circuit controlled by a pair of microprocessors and addressing a read/write memory for storing information on the states of the sensors. A microprocessor, upon receiving from a sensor an identification request for a selected outgoing line, such request implicitly coding a selected input line, activates a relay which closes a circuit enabling the energization of a sensor whose output signal to the logic network identifies the outgoing line selected via the switchboard for connection to the prior-identified incoming lines.

Abstract: A line identifier at a telecommunication switchboard comprises a matrix of magnetic-induction elements serving as current sensors for detecting a request for establishing a connection between a selected incoming line and a selected outgoing line. The sensors are connected to a multiplexer for providing samples in a time-division mode to a logic circuit controlled by a pair of microprogrammers and addressing a read/write memory for storing information on the states of the sensors. The logic network, upon receiving from a sensor an identification request for a selected outgoing line, such request implicitly coding a selected input line, activates a relay which closes a circuit enabling the energization of a sensor whose output signal to the logic network identifies the outgoing line selected via the switchboard for connection to the prior-identified incoming line.