User Manual

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Cellular Networks
GPRS mode to Internet
2.The originating OnCell device dials the phone number of the ISP (Internet Service Provider) just like an
analog modem. Normally, ISPs offer free accounts and passwords for you to access the Internet.
IP Gateways and GPRS
GPRS is designed for packet data communication and provides GSM users with access to the Internet from
a cellular network. Before activating the GPRS function on your OnCell G3100, make sure that the SIM card
is GPRS-enabled with the right APN string.
In order to activate GPRS service on your OnCell device, your SIM card must first be connected to a GSM
network. That is why the GSM LED on your OnCell device will be lit for a while before the GPRS LED turns
on. You will also need the APN (Access Point Name) and account password (not required by some cellular
providers). The APN is a string that determines which Internet gateway (GGSN) from the cellular provider’s
network you can access. This may affect the IP address and services, such as port blocking and VPN, you
are able to obtain from your provider. Cellular providers also maintain a database (HLR) to record and bill
your service level.
If your SIM card is already GPRS-enabled and has the right APN, then your OnCell G3100 will automatically
set up the IP link for your application whether you’re using socket mode or operation mode.
Modem Extension Mode (Virtual Modem)
Modem Extension Mode is a solution for
• Extending the distance from the control center to a pure AT modem, and
• Sending pure AT commands to control your OnCell G3100 device via Ethernet (longer distance).
If you need to control your modem from a longer distance, consider using an Ethernet link. This solution
allows you to keep the serial control interface at the control center and send AT commands from the control
center to your OnCell G3100 device by Ethernet.
You will first need to install OnCell Driver Manager on the controller side to create a virtual COM port, which
will allow you to control the serial port as if it were a traditional modem and send AT commands to set up
CSD calls, send SMS messages, or link to GPRS. You also can install the OnCell modem driver so you can
set up dial up networking for your laptop.
PPP to Internet via ISP