Is it necessary to use an attenuator for a dark fiber with a length of 28KM?
by W***r on 12/01/2021
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No, you do not need it. Theoritically speaking, there is no need to add an attenuator for ER4 at distances over 18km. And for connections less than 18km, 3dB ~ 5dB attenuation can be added to protect the modules according to the actual link loss. by O***n on 12/02/2021