Abstract: A device for the transmission of synchronous information by an asynchronous network, notably an ATM type network, where information elements are conveyed by packets of data bits between a transmitter unit and a receiver unit. Each of these packets is formed by an information cell comprising a header carrying an address and a useful field bearing the information to be transmitted. The transmitter unit and the receiver unit work with each other in a synchronous mode on the basis of respective plesiochronous local clocks. The device detects and compensates for a lengthy fading of transmission of the flow of information cells received by the receiver unit. The device also detects and compensates for a loss or insertion of cells in the flow of information cells received by the receiver organ.