@Virgo But Anyway It is really great that after eight (8) posts also you understand our problem which is described in original headline! :)

@Virgo So is there any way i can see logs in ER7206 to troubleshoot? or where can i see tranceiver info data? I have also tested configuration ER7206 SFP port -----SFP Module (TL-SM321B) --- SFP...

@Virgo Please keep in mind that ER7206 has two wan ports SFP and RJ45 and SFP port is that what is not working (with SFP of course :)... Possible Hardware fault in all 1.0 devices? My network...

@Alam0786 Same problem here also. Tested with TL-SM321B(UN) Ver 2.0 and TL-SM321B both of them are working in MC220L witch is now connected to rj45 wan of ER7206. If i connect SFPs directly to ER7206...