Method for establishing a global time base in a timed communications system and associated communications system

<?claim ?>Method for establishing a global time base in a time-controlled communication system (1) comprising a network (2) and a plurality of connected thereto subscriber (3), wherein at least one of the participants (3) of the communication system (1) is defined as a time master to which the other participants (3) are synchronized, wherein a subscriber (3) as a main time master and at least one further subscriber (3) is defined as a reserve time master, the order of the reserve time masters is predefined, if more than one participant ( 3) is defined as a reserve time master, being first tries to synchronize all participants (3) of the communication system (1) on the main time master, and if this fails, as long as chosen in the order each of the next reserve time master is and will be tried (3) of the communication system (1) to synchronize all participants to the selected reserve time master until either the synchronization of the subscribers (3) of the communication system (1) has been successful or even a synchronization of the subscribers (3) is the last reserve time master failed, characterized in that ...