Motorola V186 - Cell Phone - GSM System Planner Manual page 119

1. Assign FEP need to have a fixed IP or host name. Make sure operator support
UDP port 2002 from modem to FEP and vice versa.
2. Assign an IP conversion Table for RTUs having that FEP IP address or host
name.
3. In application of RTUs transmit periodically to FEP, so it learns the recent
address. Recommended time every 2 minutes. A better example is to wait for a
timeout and if not getting anything from FEP send it a message.
Since there is no fixed IP addresses one modem cannot communicate with another. If this
is required, the FEP can be used to route information between modems as follows:
1. Assign an IP conversion Table for RTUs that has the FEP Site ID + Link ID and
IP address, along with all other relevant sites it needs to communicate over that
GPRS Link ID.
2. In FEP enable the 'Enable routing of MDLC over IP port' parameter for that Link
ID.
GPRS does not support group calls (RTU-to-RTU broadcasts). To send a frame to a
group of sites, the application should send to each site individually, leaving a short wait
time between each transmission (about 300 milliseconds).
Configuring an RTU to operate over GPRS is the same as configuring MDLC over IP for
the Standard modem connection. If a modem configuration file is used (e.g. G18.stm),
this too must be downloaded to the appropriate RTU port.
Note that before downloading the modem configuration file for GPRS, you need to
change its APN according to your operator instructions. The APN (Access Point Name)
is an address such as intranet.motorola.com. The APN defines the security and
capabilities set by your provider for your SIM cards.
Note: Each SIM Card has unique identifiers for a GPRS/GSM modem. Placing a given
SIM card on different modems causes the same settings to be retrieved from
infrastructure (phone number, IP Address etc.) regardless of the modem.
Use the STS Add-Ons Manager and Downloader to select the modem configuration file
for the specified port and download the G18.stm file.
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Communications