WDM Span Check


Use the Wavelength Division Multiplexing (WDM) Span Check subtab to verify span losses on the network. The span loss verification measures the far end optical service channel (OSC) power with the near end OSC power.

Item

Description

Side

The side for which span loss information is displayed, either East or West.

Min Exp Span Loss (dBm)

The minimum expected span loss (in dBm) for the incoming span. This value is imported from Cisco MetroPlanner, but can be manually modified.

Max Exp Span Loss (dBm)

The maximum expected span loss (in dBm) for the incoming span. This value is imported from Cisco MetroPlanner, but can be manually modified.

Meas Span Loss (dBm)

The measured span loss value.

Resolution

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.