Hi, there.
What is the GPON ONT authentification method?

1.ONT is in O1 state (powered on or LOS/LOF)
2.ONT has received downstreamflows, transfer to O2 state
3.ONT has received Upstream_Overhead messages, including network parameters, transfer to O3 state
4.ONT has received SN_request, and reply its SN number, then OLT will check if sn matches its preconfiguration, ONT will be allocated a ONT-ID,tranfer to O4 state
5.ONT has received Ranging timemessage, transferred to O5 state (online successful)
I hope it will be helpful for you. Thank you!