The new Nv2 (TDMA) Sxt 5HnD CPE by Mikrotik can suprise with the speed, configurability and scalability. Even though it has only Level3 of Mikrotik License it is enough to make PtP bridge. This is an example shows how the bridge be done using MPLS instead of WDS.
ICS-100 Media converter RS232/422/485 to Ethernet
Cost-effective Solution for RS-232 / RS-422 / RS-485 to Ethernet Application
PLANET ICS-100 Media Converter / Device Server provides to convert Serial RS-232 / RS-422 / RS-485 communication ...