Method and communication system for establishing at least one fail safe communication link

在一个通信装置(KE)中设置有多个互相对应的连接单元，当时多个为了实现至少一个通信关系预先规定的冗余传输线路(UL1...4)之一连接到其上。在每个连接单元(AE 1、2)中，为了控制集中在通信装置(KE)中和/或在当时的连接单元中实现的功能，预先规定有控制功能(zsf1、2)。按照本发明，在连接单元(AE1、2)之一中，至少一部分控制功能(zsf1、2)发生故障时，至少发生故障的通信装置特有的和/或连接单元特有的功能，要通过至少一个分配的连接单元(AE1、2)来控制。有益的是，将线路冗余与一个中央连接单元或组件的一个组件冗余组合起来，它既包括通信装置(KE)的局部接口功能，也包括中央控制功能。 The invention relates to a communication system comprising several connection units, associated to each other and to which several redundant transmission lines, provided for establishing at least one communication link, are respectively connected. In each of said connection units, control functions are provided for controlling functions which are centrally executed in said communication system and/or in the respective communication unit. According to the invention, in case of failure of at least one part of said control functions in one of the connection units, at least the failed communication system-specific and/or connection unit-specific functions are controlled by the control functions of the at least one corresponding connection unit. Advantageously, the line redundancy is combined with a module redundancy for a central connection unit or module, which contains both local interface functions and central control functions of the communication system.