User's Manual

Page 169 of 187
TECHNICAL MANUAL
Telit GM862 PCS
Tri Band GPRS Data Terminal System Rev.1
2.9 Easy GPRS Extension
2.9.1 Overview
The Easy GPRS feature applies only to the Telit GM862-PCS and allows a Telit GM862-PCS 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 GM862-PCS 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 GM862-PCS 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.
2.9.2 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
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)
Telit
GM862-GPRS
networks
<<<---------------------------------- Virtual Serial link ---------------------------------->>>
network interworking
Mobile Terminal GPRS Network and Internet