Telit EZ10-GPRS/-PCS
Product Description
80269ST10014a, Rev. 3 – 26/09/05
Reproduction forbidden without written authorization by Telit Communications S.p.A.
Page 31 of 74
All Rights reserved – Right of modification reserved
3 Software Features
3.1 Enhanced EASY GPRS Extension
3.1.1 Overview
The EASY GPRS feature allows a user of the
Telit wireless modems
EZ10-GPRS and EZ10-
PCS with PYG Option
to contact a device in the 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 wireless modem
EZ10-
GPRS / EZ10-PCS with PYG Option
, 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 wireless modem
EZ10-GPRS / EZ10-PCS with PYG Option
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.
The new
Enhanced version
of the EASY GPRS overcomes some of the known limitations of the
previous implementation and implements some new features such as:
-
Keep the GPRS context active even after the closing of a socket, allowing the application to
keep the same IP address;
-
Also Mobile terminated (incoming) connections can be made, now it is possible to receive
incoming TCP connection requests;
-
A new internal firewall has been implemented in order to guarantee a certain level of security
on internet applications.
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
Telit
EZ10-GPRS
networks
Firewall
<<<---------------------------------- Virtual Serial link ---------------------------------->>>
network interworking