Why does the PON optical power meter have two interfaces

This is because the PON optical power meter needs to be connected to the PON network line in series during the test, so two test optical ports are required, one is connected to the 1490nm optical sign...

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The FX81T PON power meter performs filtered power level measurements on two downstream wavelengths and is suitable for GPON/ XGS-PON or EPON/10G EPON systems. Power levels are

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