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EXFO FTB -5240S/5240BP Optical Spectrum Analyzer for FTB 500 (NS-1434) User Manual

Page 80

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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.