EXFO FTB -5240S/5240BP Optical Spectrum Analyzer for FTB 500 (NS-1434) - Manual (Page 109)

Setting Up the Instrument in WDM Mode
Optical Spectrum Analyzer 101
Setting Up Acquisition Parameters
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If you are performing an Averaging or In-Band type acquisition,
enter the number of scans the unit will perform.
3. Select the wavelength range for your acquisition.
You can select the wavelength range by entering the start and stop values
or by selecting a range on the double slider.
To select the wavelength range using the double slider, move the left and
right handles on the double slider or simply click on any band.
The wavelength range covered within these bands of the spectra are listed
below.
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O band (original): 1259 to 1361 nm
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E band (extended): 1359 to 1461 nm
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S band (short wavelengths): 1459 to 1531 nm
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C band (conventional “erbium window”): 1529 to 1566 nm
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L band (long wavelengths): 1564 to 1626 nm
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U band (ultralong wavelengths): 1624 to 1650 nm.