(ONS
15454 SDH 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.
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Displays the side for which span loss information appears, either East or West.
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Displays the minimum expected span loss (in dBm) for the incoming span. This value is imported from Cisco Transport Planner, but can be manually modified.
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Displays the maximum expected span loss (in dBm) for the incoming span. This value is imported from Cisco Transport Planner, but can be manually modified.
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Displays the measured span loss value.
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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.
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For higher resolution span loss measurements, use an optical time domain reflectometer (OTDR). |
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Retrieve Span Loss Values
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Runs the span loss verification function and retrieves values for the measure span loss column.
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Resets the minimum and maximum expected span loss values.
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Applies changes made to the minimum and maximum expected span loss fields.
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Displays context-sensitive help.
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