User's Manual

Telit TRIZIUM Product Description
80264ST10007a Rev. 4– 09/09/04
Reproduction forbidden without DAI Telecom written authorization – All Right reserved – Right of modification reserved page 168 of 202
5.8 Easy GPRS Extension
5.8.1 Overview
The Easy GPRS feature applies only to the Telit TRIZIUM and allows a Telit TRIZIUM user to
contact a device in internet and establish with it a raw data flow over the GPRS and Internet
networks.
This feature can be seen as a way to obtain a "virtual" serial connection between the Application
Software on the Internet machine involved and the controller of the Telit TRIZIUM module,
regardless of all the software stacks underlying.
An example of the protocol stack involved in the devices is reported:
This particular implementation allows to the devices interfacing to the Telit TRIZIUM module the
use of the GPRS and Internet packet service without the need to have an internal TCP/IP stack since
this function is embedded inside the module.
5.8.2 Easy GPRS definition
The Easy GPRS feature provides a way to replace the need of an Internet TCP/IP stack at the terminal equipment side.
The steps that will be required to obtain a virtual serial connection (that is actually a socket) to the Internet peer are:
a) configuring the GPRS Access
b) configuring the embedded TCP/IP stack behaviour
c) defining the Internet Peer to be contacted
d) request the GPRS and socket connections to be opened (host is connected)
e) exchange raw data
f) close the socket and GPRS context
All these steps are achieved through AT commands.
As for common modem interface, two logical status are involved: command mode and data traffic mode.
- In Command Mode (CM), some AT commands are provided to configure the Data Module Internet stack and to
start up the data traffic.
Remote
Controller
Device
Device
(Internet)
Local Remote
Application Application
TCP/UDP
EASY EASY TCP/UDP
GPRS
GPRS
IP
IP
IP
IP
Serial
Data
Line on
Driver Board
L2
L2
V.24
V.24
L1 L1
Terminal
Equipment
Remote
Device
(Internet)
network interworking
Mobile Terminal GPRS Network and Internet
Telit
TRIZIUM networks
<<<---------------------------------- Virtual Serial link ---------------------------------->>>