Industrial 4g lte modem router, serial to cellular modem supports america, europe, asia and australia version Industrial 4g lte modem, serial to cellular modem 4g lte modem â?? usr-g781 is a 4g/3g router and serial data transmit unit. Usr-g781 provide a serial to cellular networking solution. Industrial ethernet device or serial device can use g781 to access the internet database. Features of industrial 4g lte modem, serial to cellular modem Support american version, european version and austrian version. 2 rj45 port, one can be wan or lan port and another one can be lan port. Support vpn(pptp) client. Support static routing Support firewall and qos Support ddns Support ntp to check the time. Support tcp/udp client mode and server mode. Support identity packet and heartbeat packet. Support serial to http format Support upgrading firmware via ftp. Integrated hardware and software watchdog timer. All usr products will be tested by r&d first, then production test again.(esd test, surge/eft test, high/low temperature test, emc and lvd environment reliability test,