Robert Boschgmbh

Helmut Tiltmann

Jan Koeppen

Guenter Neumann

The control of the transmission of useful optical signals on different line paths of an optical transmission device is accomplished via at least one of the following features: using signal sources and signal sinks, the useful optical signals are coupled into the line paths, or are coupled out of them; at least one portion of the optical line paths is configured as normal line paths having coupling nodes via which a switchover to an alternative line path can be undertaken if a normal line path is disturbed; in addition to the useful optical signals, test signals, whose evaluation is used for the switchover between the line paths, are transmitted bidirectionally section-by-section; at least two types of test signals can be transmitted, of which a first type is used as an indicator for an intact line path and a second type as an indicator for a disturbed line path; and any switchover to an alternative line path is only undertaken if, before the detection of the disturbance, a test signal of the first type has been transmitted on the normal line path. A decentralized switchover of the line paths is provided and pointless switchovers, which do not lead to any improvements in the transmission, can be avoided.

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Emsdetten, Germany

Helmut Tiltmann