Its the lights on the ONT that are initially more important than the status of the router, as already stated, a flashing PON light means the the ONT is receiving a ‘light’ signal , but the headend (OLT) hasn’t authenticated the ONT , this can be issues such as the ONT serial number hasn’t been correctly entered , or is missing , so the OLT won’t ‘talk’ to the ONT, in basic terms , the ONT is repeatedly saying ‘Hello’ to the OLT, the OLT can ‘hear’ this , but won’t respond because the ONT isn’t on its list of valid users, basically it won’t ‘talk’ back until it’s told that the ONT is allowed onto the network.
When you ring the FTTP team you could ask if the correct serial number is entered , you can read the S/N from the sticker on the ONT .
Unfortunately this isn’t the only possible issue , but it’s a fairly simple one to sort out.
