Siemens Aktiengesellschaft

Wilhelm-Martin Plotz

Detlef Stoll

Hubert Jaeger

Gerhard Stortz

Reinhard Johannsen

A central equipment is connected by at least two optical fibers to a decentralized optical equipment and the central equipment creates an optical auxiliary signal which is transmitted together with an optical payload signal from the central equipment to the decentralized equipment. The optical auxiliary signal that is received in the decentralized optical equipment is rerouted and transmitted back to the central optical equipment via another optical fiber in addition to a second payload signal, and the reception of the optical auxiliary signal is optically monitored in the central optical equipment to determine if there is a breakage in either one of the fibers extending to the unit.

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Vienna, Austria

Wilhelm-Martin Plotz