It is very important to check the GPON ONU received optical power, the number xxxx dBm at the back, if it shows -inf dBm, it means that the cable is not connected properly, and when it is connected properly, it usually shows a number within -10 dBm to -24 dBm. The size of the light attenuation will not affect the speed of the Internet, as long as it can be registered, it will not affect the speed of the Internet.

Rx power value (dBm )Healthy
-10 to -18very good
-20 to -24generally normal
-25 to -26working on the edge of danger
-27<disconnect at any time
-inf dBmfiber not connect
GET OPTICAL POWER METER

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