According to data sheet FWA-5020U-00A1R has “2*10GbE SFP+ via Intel® X710”, this article provides compatible transceivers which Advantech has verified on this model.
All users who are using Advantech FWA-5K series and need to apply network traffics through these 2 x 10GbE ports
Eoptolink EOLS-1312-10-Dl (1000BASE-LX SFP 1310nm Transceiver)
Advantech SFP-GSX/LC-AE (1000Base-SX Multi mode SFP module)
Advantech SFP-GLX/LC-10E (1000Base-LX Single mode SFP module (10km))
Advantech SFP-GTX/RJ45 (1000Base-T RJ45 SFP Transceiver Module)
FINISAR FTLX8574D3BCL (10GBASE-SR/SW 10G Ethernet)