GSM ( Model S:1901G )* Support GSM 900/1800Mhz or GSM 900/1800MhzSpecifications :* 1x Serial Port , RS232/485/422 Optional , 1x RJ45 ( 10 Base-T )* With CPU , Flash and SDRAM* Support Data Transparent tranmission* Support Wireless Modem and Router Mode* Support VPN / IPSEC , Static / dynamik NAT , DHCP Server* Support always online and data awake mode* Support TFTP upgrading* Support Telnet / Web NMS* Can meet Machine to Machine ( M2M ) Communication requirement , Such as Bank ATM Connection , autometi cally meter reading.
For info see http://www.smartlintas.com/
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