WDM Span Check
(ONS 15454 only) Use the Wavelength Division Multiplexing (WDM) Span Check subtab to verify span losses on the network. The span loss verification compares the far end optical service channel (OSC) power with the near end OSC power. The graphic shown on the subtab compares the channel power level at the 32 span losses on the network. The span loss verification compares the far end OSC power with the near end OSC power.
 
Item
Description
Side
Displays the side for which span loss information appears, either East or West.
Measured By
Displays a measured by value.
Min Exp Span Loss (dB)
Displays the minimum expected span loss (in dB) for the incoming span. This value is imported from CTP, but can be manually modified.
Max Exp Span Loss (dB)
Displays the maximum expected span loss (in dB) for the incoming span. This value is imported from CTP, but can be manually modified.
Meas Span Loss (dB)
Displays the measured span loss value.
Resolution (dB)
Displays the resolution or accuracy of the span loss measurement. The resolution is +/–1.5 dB if the measured span loss is between 0 and 25 dB. If the measure span loss is between 25 and 38 dB, the resolution is +/–2.5 dB.
Note
For higher resolution span loss measurements, use an optical time domain reflectometer (OTDR).
Retrieve Span Loss Values
Runs the span loss verification function and retrieves values for the measure span loss column.
Reset
Resets the minimum and maximum expected span loss values.
Apply
Applies changes made to the minimum and maximum expected span loss fields.
Help
Displays context-sensitive help.

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