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Anritsu FAQs

I've recently upgraded the firmware on my S331D and now under the DTF, I see an option for Optical. What is that?
answer
The S331D when upgraded to Version 5.23 firmware or later has the internal capability to make Optical Distance To Fault  measurements.  An external Optical Distance to Fault Module is also needed to make the Optical DTF measurement.  This part number is ODTF-1.