... command 4.RS232/RS485 IP modem, RS232 modem, GSM IP modem, GPRS data modem, data terminal,GPRS DTU, TCP/IP modem, IP WIRELESS MODEM ... , 3G IP MODEM, EDGE MODEM,gsm fixed wireless terminal, fixed wireless terminal, gsm sim box,zte wireless EF2103 GPRS terminal connectors SPECIFICATIONF2113 GPRS Data Terminal Units adopts high-powered RISC CPU ...