... , including online detect, auto redial when offline to make router always onlineEthernet port: 1.5KV magnetic isolation protectionRS232/RS485/RS422 ... CLI) High-performance Support multiple WAN access methods, including static IP, DHCP, L2TP, PPTP, PPPOE, 4G. LTE/ 3G/HSPA+ Support ... link speed statistics etc. Full protocol support, such as TCP/IP, UDP, ICMP, SMTP, HTTP, POP3, OICQ, TELNET, FTP, SNMP, ...