Abstract: A method, a system and a master terminal for line monitoring in system comprising a telephone network (ISDN), a master terminal (MASTER) connected to a place of reception (PR) of a response and to the telephone network (ISDN), and a slave terminal (SLAVE) connected to an object being monitored (OM) and to the telephone network (ISDN).

Abstract: A method of and a device for receiving data in packet form. In the method, a synchronization with incoming data is searched for by using a receiving modem, and first clock pulses in correct synchronization with the data are generated and the synchronized clock pulses are supplied to a receiver circuit system to ascertain the synchronization and to start receiving. To reduce repetitions necessary due to a data break after the reception of data has started, second clock pulses generated by an outer circuit are synchronized substantially to the same frequency and the same phase as the first synchronized clock pulses and the clock pulses to be supplied to the receiver circuit system are replaced for the time of the latter part of the data packet by the second clock pulses generated by the outer circuit.