In my specific situation I was able to use this WAS-110 to get full speed PPPoE from my fiber provider (Bell).
https://pon.wiki/guides/masquerade-as-the-bce-inc-giga-hub-2...
https://pon.wiki/guides/masquerade-as-the-bce-inc-giga-hub-2...
I use the same WAS-110 on Bell.