Alcaltel Lucent

Alcatel Lucent

Lothar Jentsch

Thomas Pfeiffer

Harald Schmuck

Michael Straub

Jörg Hehmann

Heinz Georg Krimmel

A method for monitoring a passive optical network (), PON, having a tree-like structure with a main line () and at least two branches (to), comprising: transmitting a wake-up signal () from the main line () to at least two monitoring units (DPMto DPM) arranged in the at least two branches (to), in each of the monitoring units (DPMto DPM), detecting the wake-up signal () and transmitting a response signal (A, B, C) back to the main line (), each of the monitoring units (DPMto DPM) generating a pre-defined time delay (&#x394;tto &#x394;t) between the detection of the wake-up signal () and the start of the transmission of the response signal (A, B, C), and receiving the response signals (A, B, C) at the main line (), the receiving times (Rto R) of the response signals (A, B, C) being different from each other, the difference between the receiving times (Rto R) being adjusted by the pre-defined time delays (&#x394;tto &#x394;t) of the monitoring units (DPMto DPM).

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Fredersdorf, Germany

Lothar Jentsch