Abstract: Telecommunications systems can be synchronized via the transmission link. In this process, the telecommunication systems receive the clock signal and an additional information item, which describes the quality of the clock signal, from the received data stream. In telecommunication systems which are connected to a number of differently standardized transmission networks, different algorithms for evaluating the differently formatted clock signal quality data are necessary in the main processor. The present telecommunication system simplifies the communication of clock signal qualities. The different interface cards have converters which convert the clock signal quality information between a transmission-network-specific format and an independent format. The main processor only contains a subunit for processing all clock signal qualities. The present method for synchronizing a telecommunication system includes a converting the transmission-network-specific data into messages of an independent format.

Abstract: The invention relates among other things to a method for operating a secondary computer (22), in which a memory unit in an originating computer (12) initially stores a first data volume (112) and a second data volume (114). During transmission of copies of the data volumes (112, 114), change reports (150, 154) are processed in the originating computer (12) and in a secondary computer (22) irrespective of whether the associated data volume has already been transmitted.

Abstract: A telecommunications system includes devices to provide output clock signals that are synchronous to at least one source clock signal. A main clock generator includes a selector to select one of the output clock signals. The main clock generator generates a main clock signal based on a selected one of the output clock signals. Each of the devices includes a quality detector (i) to detect a quality of the at least one source clock signal, and (ii) to interrupt providing an output clock signal in response to a decrease in quality of the at least one source clock signal. The main clock generator includes an interrupt detector to detect an interruption in an output clock signal provided by at least one of the devices. The selector selects a different output clock signal if the interrupt detector detects that the selected one of the output clock signals is interrupted.

Abstract: A method for extending the switching matrix of a communication system without interruption which is effected by reserving space for the routing addresses of the largest extension stage both in the header translation table of the interface devices and in the cell header of each ATM cell, and by providing a system split which is used to replace the old switching matrix assemblies with new switching matrix assemblies in steps, the paths via the new switching matrix assemblies, insofar as they lead to the same output-side interface devices as via the old switching matrix assemblies, being addressable using the same routing addresses.

Abstract: Different conditions of a module are indicated by means of at least one visual indicator element, for instance in the form of a light emitting diode, mounted visibly on the module. Pressing a repair key initiates a repair condition, in which the actions and control procedures necessary for taking the faulty module out of service are carried out, and also causes a newly inserted module in a module frame to be automatically recognized, prompts a test function and causes the new module to be automatically put into service upon passing a test procedure.

Abstract: A method for detecting faults, in particular transient faults which cannot be verified which occur in an electrical unit, such as a switching device, by means of a fault counter which, when a fault occurs, counts by a specific first counting value in a first counting direction and which, at specific times, in each case counts by a second counting value in an opposite second counting direction in the situation where no faults have occurred within the relevant time interval. A precautionary alarm signal is triggered on reaching a first counting threshold value in the first counting direction. A second alarm signal, in conjunction with the monitored unit being switched off, is produced on reaching or exceeding a second counting threshold value, which is higher than the first counting threshold value.