| 摘要 |
The present invention discloses a method of configuring subnodes, or configuring a system of subnodes, in an optical network ring against both node and fiber failure by means of OADM, Optical Add Drop Multiplexer. The network comprises a working ring and a stand-by ring and each subnode includes selective optical filter means, optical 2x2 switch means and optical amplifier means. The method and the system is further comprising the steps of monitoring the inputs and outputs of each subnode at the working and stand-by rings by means of monitor device means, which are generating alarm signals upon detection of signal loss at a subnode. As a response to the alarm signal the state of the subnode, which causes the alarm signal, is transferred from a first state into one of a number of possible conditions as a function of the generated alarm signal, and thereby selecting a switch configuration for the subnode according to the new state to clear the error detected.
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