Hello,
Thanks for contacting TELTONIKA | Crowd-support forum.
RUTX11 is not equipped with an SFP port for fiber optic WAN.
On the other hand, RUTXR1 is equipped with an SFP port for fiber optic WAN, console port, dual SIM (With auto failover, backup WAN and other switching scenarios), USB, and Wave-2 802.11ac Dual Band WIFI
More information can be found here:
https://www.youtube.com/watch?v=hn7bE-XyJ28
Best regards,