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6500 - ORL (optical return loss)

Question asked by jli_2016 on Jul 26, 2017
Latest reply on Jul 27, 2017 by jli_2016

have an NTK552GA MLA3 amp, trying to understand the ORL showing on PM, see below

my questions are:

1, how the ORL-OTS is measured on MLA amp?

2, ORL is only showing for port 6 and 8, then if it's port 6 as highlighted in the picture with low value, physically which port/fiber should be checked? 

3, what is the minimum value required for the ORL here?