... It adopts high-powered industrial 32-bits CPU and embedded real time operating system. It supports RS232 (or RS485/RS422), Ethernet and WiFi ... IP, DHCP, L2TP, PPTP, PPPOE, 4G. LTE/ 3G/HSPA+ Support double link backup between LTE/ WCDMA and WAN(PPPOE, ADSL) (optional ... , firewall, NAT, DMZ host, URL block, QoS, ttraff, statistics, real time link speed statistics etc. Full protocol support, such as TCP ...