I had already finished to test result TL-MR3420. I had found the problem when connected USB modem TP-LINK MA180 and D-Link DWM-156 with True, Dtac and AIS SIM pass through router Internet speed very slow and can access to internet around 5-10 minutes If I plug modem into PC directly but the same problem still be found. I think USB modem TP-LINK MA180 and D-Link DWM-156 not compatibility with sim. Because I had test connection USB modem Huawei E353s-6 can use normally.