Moxa IP Gateways include the following features:
A VPN allows a computer to use a virtual IP address to access the Internet. Instead of running across a single private network, some of the links between nodes in a VPN use open connections or virtual circuits in a larger network, such as the Internet. With the help of VPNs, cellular devices acting as VPN clients can initiate a connection with a VPN server. Once the connection is established, the cellular devices can communicate with other network devices on the same private network. Moxa's OnCell IP gateways are equipped with VPN functions to provide a secure extension of a private network into an insecure network.
Cellular-enabling Ethernet Device
The IP gateway works like a router. All Ethernet devices connected to the OnCell's LAN port are hidden via the OnCell's NAT function. This allows any number of local Ethernet devices to access the Internet using the OnCell as a gateway. However, the IP Gateways appears as just a single IP address on the Internet. As a result, incoming connections must be manually forwarded from the OnCell's public TCP port number to internal ports of the local Ethernet devices.
Virtual Modem Mode
Virtual Modem mode is designed to run with operating systems that support AT commands to extend the distance between devices and modems that communicate through the RS-232 interface (Figure 1). Figure 2 illustrates a setup that uses two device servers to extend the transmission distance. If this type of solution is not feasible, or is deemed inefficient, then greater efficiency can be achieved using Moxa's OnCell IP gateway (Figure 3). By connecting a properly configured OnCell IP gateway's Ethernet port to the computer's Ethernet port, and installing the Moxa driver in the computer, it is possible to transmit data over the cellular network, even if the software running on the computer was originally designed to transmit data through a modem.
Standard TCP/IP Architecture
Moxa's IP gateways come with a full TCP/IP architecture to make it easy to connect to the cellular network. Three modes are supported: TCP Server, TCP Client, and UDP. Whichever mode is used, once a connection is established, the two sides of the connection can both send and receive data.
Ethernet Modem Mode
Ethernet modem mode, which is designed for use with legacy operating systems which do not support TCP/IP networks such as AT-command, can dramatically simplify the integration of legacy devices into your cellular network. Connecting a properly configured OnCell device port to the legacy device's serial port allows you to use legacy software to transmit data over the cellular network, even though the software was originally designed to transmit data over a modem. This is accomplished by converting dialed AT commands into the IP format.
Overview of Moxa's IP Gateway Products
IP Gateway Ethernet Device←→Cellular VPN Ethernet Modem Mode Virtual Modem Mode
   OnCell G3110/G3150
   OnCell G3110/G3150-HSDPA  
   OnCell G3111/3151    
   OnCell G3211/3251    


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