Hello Pieter.
Unfortunately, that's not nice to hear. But thank you for your reply. It is a Genexis OLT based on the same syntax as Cisco OLTs. That's why I asked here.
With Alcatel/Nokia OLTs, messages from ONTs are actively logged. And we would like the OLTs to report to our system, hence the desire for syslog. But if that doesn't work...