3 easy gsm, 1 overview – Rainbow Electronics GM862-QUAD-PY User Manual
Page 45
Easy GPRS User Guide
80000ST10028 Rev. 4 - 16/07/08
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved
page 45 of 63
3 Easy GSM
3.1 Overview
This new feature allows the
Telit module
users to connect to an Internet Service Provider through a
GSM CSD call and to use the embedded TCP/IP stack, such as in Easy GPRS, to contact a device in
Internet and establish with it a row data flow over the Internet networks.
The connection between the module and the Provider is based on PPP protocol over a GSM CSD call.
An example of the protocol stack involved in the devices is reported:
In this case the speed at which packets can be downloaded is limited to the maximum data rate for a
data call, 14400 bps.
All the features of Telit multisocket, FTP and EMAIL can be used over the GSM carrier.
In order to enable GSM carrier, a particular context has to be activated with identification number 0.
The use of this context is analogue to that of GPRS contexts.
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PPP
L1
IP
V. 24
Serial Line
Driver
Local
Application
V. 24
Data on
Board
EASY
GPRS
TCP/UDP
L2
IP
TCP/UDP
Remote
Application
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Controller
Device
Telit‘s
Module
GSM/PSTN Network and Internet
Remote
Device
L1
L2
PPP
IP