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Cisco ONS 15454 DWDM Reference Manual, R8.5
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Chapter 9      Node Reference
9.7.2    Using the Graphical Display
9.7.2.10 Displaying Optical Path Power
To show the optical power present in an optical path, move the mouse over the desired optical path (green 
line). A tooltip shows the power along the optical path in dBm (see Figure 9-51).
Figure 9-51 Optical Path Power