Hi @LeadershipGeek 

Thanks for posting in our business forum.

So, I assume you are using the ETH from your ISP and a media converter to fiber? This information was not given and that's my assumption. If necessary, correct me.

If it is a media converter, make sure you have the correct SFP modules on both ends and fiber that works with the module you got.

And note that if you have a modem, the media converter cannot replace the modem. Make sure you have a correct diagram.

Troubleshooting Instruction of SFP/Media Converter

The Q&A about the compatibility of the TP-Link SFP modules with the third party devices

Hi @LeadershipGeek 

Thanks for posting in our business forum.

LeadershipGeek wrote

  @Clive_A I bought this Ethernet SFP adapter. 
 

my assumption was that I could use the SFP port as an additional Ethernet port on the router. 
 

am I fundamentally misunderstanding the capability of the port itself, or is there potentially a compatibility problem with the adapter and the router?  The Amazon description says it works, but that's not always reliable info. 
 

 

Cable Matters 1000BASE-T Gigabit SFP to RJ45 Copper Ethernet Modular Transceiver for Cisco, Ubiquiti, TP-Link, Huawei, Netgear, and Supermicro Equipment

 

 

So, brand name is Cable Matters? Not familiar with it. But based on my experience, third-party may not go well. The Q&A about the compatibility of the TP-Link SFP modules with the third party devices

I would go for a TP-Link RJ45 SFP module as far as I know people who ran into trouble before after switching to our modules work. See the 1G model here: https://www.tp-link.com/en/business-networking/omada-accessory-module-cable/?filterby=6409