Abstract: A method for testing a network made up of network nodes and devices connected to network nodes, has the steps:

Abstract: A circuit system (100) and a method for synchronized transmission of audio data streams in a bus system, in particular based on the IEEE 1394 Standard, by which, among other features, the sample data frequency of the data source may be recovered in the data sink without a PLL circuit system, including the following:

Abstract: A method for controlling devices in a communications network in a motor vehicle and a device in a communications network in a motor vehicle are proposed, which are used to control newly added devices. To that end, a generic control module and data stored in the device are used to generate a device-specific control component, which can be used to control the device. The device-specific control component can either be added to the generic control module or can be stored independently of the generic control module in the respective device. The generic control module is used in a gateway or a system manager of the communications network. The human-machine interface is adapted by means of the device-specific control component. A bus system, preferably embodied according to IEEE 1394, is used as the technology for the communications network. The essential advantage of the invention is the self-configurability of the communications network and its devices.

Abstract: A manufacturing method for a device made up of multiple components, including at least one program-controlled component, is described. After the program-controlled component has been installed and before the manufacture of the device is completed, the program-controlled component is caused to execute a test program and the manufacture of the device is only continued if no faults are detected when the test program is run.

Abstract: A method a method of accessing a device in a communications network in a motor vehicle via an external device (1) is described, a software element being transmitted to the external device in the case of authorized access to a device in the communications network to permit control of the device in the communications network by the external device. A gateway checks on whether access is possible, either checking directly with the device requested or via the system manager. Security in communication between the external device and the device to be controlled is achieved by an additional encryption and/or a specified validity period of the software element transcribed to the external device. If there is no software element for a device to be controlled, such a software element is created by using a control module and data stored in the device. A bus system, preferably according to IEEE 1394, is used as the communications network. This method increases security while at the same time using a less complex gateway.

Abstract: A method of operating a device which is connected to a vehicle communications network is described, a switched-off device being reactivated by the bus manager via a frequency pulse transmitted over a power supply line. The device may be switched off by the bus manager or by itself if there is no data communication with the device for a predetermined period of time. The frequency pulse is analyzed by an analyzer circuit of the switched-off device, the analyzer circuit having a frequency-selective filter and a threshold detector. The frequency pulse may be transmitted at a frequency which is valid for only one device or at a frequency for a group of devices or at a frequency for all devices. If the devices are arranged in branches, then all the devices downstream from a switched-off device are also switched off or reactivated.

Abstract: A vehicle computer arrangement, particularly for a motor vehicle, a train, an airplane or a ship, which is provided with at least two computers (10, 20) and at least one data bus (60) via which the at least two computers (10, 20) are interconnected, and in which at least one monitoring circuit (40) is arranged between a first computer (10) and a second computer (20) of the at least two computers, the monitoring circuit checking whether a data exchange between the first and the second computer is permitted for data processed or to be processed in the first or the second computer, and blocking the data exchange in the event that it is not permitted for the monitored data.

Abstract: A bus station for an optical bus system includes an input stage and an address detection device. The address detection device is deactivated in a first rest state.