86 – Operating and Maintenance Instructions
2. Select the checkboxes to turn on the analysis parameters and to fill the required user
parameters. The analysis parameters are:
• Passband—Passband is evaluated at the threshold, which is measured in dB or linear
units, from the primary channel. In the Threshold field, enter a value ranging from 0 to 1.
• Flatness—Flatness is measured across the top of the peak. The bounds of the
measured range are defined as either the passband or bandwidth. Alternatively, enter the
numerical distance from the primary channel. The distance is in nm or GHz, as defined
by the user in the Engineering Unit section of this dialog box. To measure flatness, also
define the parameters for passband or bandwidth, as applicable.
• Crosstalk—Crosstalk is the difference in power between the primary channel and its
adjacent channels, which are the channels to the immediate right and left of the primary
channel. Adjacent channels are defined by the user in the Selecting the ITU Grid or
Specifying Channels section.
• Cumulative Crosstalk—Whereas crosstalk measures the difference in power between
the primary channel and the adjacent channels, cumulative crosstalk measures the
difference between the power of the primary channel and the sum of the powers of the
remaining channels in the defined wavelength range. Adjacent channels are defined by
the user in the Selecting the ITU Grid or Specifying Channels section.
For a full description of how SWS defines these values, see the How the SWS
Calculates Values section.
Selecting the ITU Grid or Specifying Channels
To define new communications channels or to select a standard set of ITU channels, press the
Setup button in the Analysis Setup dialog box. A dialog box appears, as shown in Figure 73.
Figure 73: Selection of Channel or ITU Grid Settings
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