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Remote-SAT User's Guide
MC35_SAT_01_v02.00
Page 5 of 65
11.01.2002
1  AT Commands for Remote-SAT in MC35
This document presents the specification for AT commands and responses required for the SIM
Application Toolkit (SAT) implementation in MC35.
1.1 Introduction
SIM Application Toolkit (SAT) is a technology that lets the SIM card execute a great variety of
additional applications. Conventionally, SIM cards are intended to store user specific data, such as
phonebooks, secure user identification codes and messages, but they can also hold a lot of value-
added mobile applications.
The SAT functionality integrated in MC35 and MC35T allows to execute network specific applications
implemented on the SIM card. Typical examples are online banking and information services.
The commands exchanged between SAT and the SIM application fall into two categories:
 
Proactive commands – sent from the SIM application to the module’s SAT, e.g. DISPLAY TEXT.
  Envelope commands – sent from the module's SAT to the SIM application, e.g. MENU
SELECTION.
The SAT implementation supports SAT class 3, GSM 11.14 Release 98, no support of letter classes.
GSM 11.14 describes Proactive and Envelope Commands in detail.
Note:
The part on PC or PDA side which handles the Remote-SAT AT command interface (referred to as
SAT-IF-Handler) is available as an exemplary implementation guidance as source code.
For details, please contact the Wireless Modules Application Engineering Department at Siemens AG.