EXFO FTB -5240S/5240BP Optical Spectrum Analyzer for FTB 500 (NS-1434) User Manual
Page 80
Setting Up the Instrument in WDM Mode
72
FTB-5240S/5240BP
Setting Up WDM Analysis Parameters
2. Select the Default Thresholds tab.
3. Enter values in the boxes as explained below:
³
Wavelength/Frequency (nm/GHz): indicates the channel’s central
wavelength/frequency.
³
Signal power (dBm): indicates the signal power for the selected
channel (excludes noise).
³
OSNR (dB): is the Optical Signal to Noise Ratio, given by Signal
power (according to the current calculation method, in dBm)
minus Noise (according to the current calculation method, in
dBm).
³
Noise (dBm): indicates the level of the noise for the selected
channel.
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