... modem, GSM IP modem, GPRS data modem, data terminal,GPRS DTU, TCP/IP modem, Support transparent data transfe ... , smart grid, industrial automation, telemetry, finance, POS, water supply, environment protection, post, weather, etc. High-performanceSupport ... 1.8V user card interface, 15KV ESD protectionPowerTerminal block interface, reverse-voltage and overvoltage protectionTerminal BlockAntenna Interface ...