Small home network issue

RouterOS Beginner Basics
1

Hi, I have bit of an issue with my network setup at home and need some help, please.

My current setup is PSTN line==>ADSL modem in bridge mode==>Mikrotik RB750GR3 (port 1) ==> switch (port2 of RB750GR3)==> devices connected to switch

This is working perfectly.

Today my fiber account has been activated so I plugged port 1 of the Huawei gpon terminal (HG8240H) into port 1 of the mikrotik router.

The moment I plug the ethernet cable in, the mikrotik turns off.

I then plugged the gpon terminal into port 3 of the router and all seems be fine.

The fiber provider locked the HG8240H down as they do remote provisioning, so I cannot connect to it to check the setup.

Why would the mikrotik turn off when the cable is plugged into port 1? Port 1 is POE in, but the Huawei doesn’t seem to support poe at all.

Thanks

2

I would suspect that PoE is somehow responsible. If you want to test this, put a switch between ether1 and the ONT. If it works with this in the middle, then probably there’s something on the wire coming from the ONT that makes the Mikrotik expect PoE power but get none.

Worst case, use another interface and chalk it up to one of life’s little mysteries. You can always reconfigure ether1 to be one of your LAN ports so you’re not losing an interface.

3

Ah, thanks for the idea. I will test it today with a switch in between.

4

I ended up using port 5 of the router. Everything is working fine now.
I suspect it is indeed a POE related issue.