MOXA Industrial Cellular IP Gateway
Cellular IP Gateways vs. Cellular Modems
The difference between using a cellular IP gateway and a cellular modem is how host PCs connect to the device. With a cellular IP gateway, the host PC can connect directly to the device using TCP/IP. With a cellular modem, the host PC requires a separate modem to establish the connection.
http://www.moxa.com/Event/IW/2010/OnCell_IP_Gateway/index.htm
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