Mobile devices using 3G and LTE are equipped with a second receive antenna for improved performance. This second antenna is required for receive diversity and MIMO. These concepts, with their associated benefits, requirements and test possibilities, are described in this Application Note in a Q&A format.

This Application Note presents the steps to set up a PPP connection in Linux Operating System using the Sierra Wireless embedded module. As Windows® and Linux® have different procedures for creating a PPP connection, this application note provides details about the process for Linux environment. The steps to create the connection are well supported with images to graphically depict those steps.

This application note presents the recovery mechanism of the Open AT Application Framework. The goal of the mechanism is to avoid infinite and uncontrolled reset loops in the firmware.

This application note describes how to interface an external battery charging solution with an AirPrime wireless module. It is useful if you have the following requirements: Measured current consumption Different modules' operating modes Different scenarios. This application note will be useful for those customers who want to obtimize the size and the capacity of the battery to be used.

This Application Note describes a method to wake up an embedded module by motion detection through the use of a 3 axis accelerometer. Generally, when an AirPrime embedded module is not needed in working mode, the best way to save energy is to enter into ALARM mode. It can then be woken up by programming an RTC interrupt. However, in specific applications, it can be useful to wake up the AirPrime module when a movement is detected. This application note shows a method to implement this mechanism.

This application note describes how to interface an external battery charging solution with an AirPrime wireless module. It is useful if you have the following requirements: Li-Polymer battery used Possible drops of the battery voltage below its over discharge threshold (~2.8V) Only a DC voltage source available to charge the battery (impossible to connect an external charger)

Data communication from Sierra Wireless modules is done through the Data layer, which is a part of the firmware. Sierra Wireless modems support both Fax classes. They are implemented as a library in the Data layer. The Fax library manages all Fax related operations for the module. This Application Note explains how to send and receive faxes.

This Application Note describes the RS-232 PC cards models that are recommended (or not) for High Speed Transfer by Sierra Wireless.

This Application Note explains the Sierra Wireless implementation for SMS Data Download. It describes: SMS data download definition in the 3GPP standard Sierra Wireless firmware behavior Advices to support SMS data download.

Devices on the management server can be viewed and managed through the web interface. This application note explains how to view details, and how to manage the units and jobs assigned to them including firmware and software upgrades. It also describes module firmware behavior and specific points around the implementation in the unit and server, plus limitations of both with good practice recommendations.

Although Sierra Wireless provides Developer Studio as a library set to use over an existing Eclipse platform, some Linux developers prefer using makefiles to generate the application binary. This application note describes the toolchain used by Developer Studio and how to use it through a makefile. A sample makefile is also provided as a reference.

The Download over the Air (DOTA II) service is provided by Open AT Application Framework to upgrade the existing/running Open AT Application Framework embedded applications or firmware dynamically over the air. This Application Note defines this DOTA functionality and how to use it.

This Application Note describes the hands free solution available on AirPrime Q26 and WMP Series, and the SL6087 module. A brief explanation of the hands free solution is followed by a detailed presentation covering the following: Overview and block schematic Parameters explanation Tuning guidelines and default parameters

This application note describes how to use SMTP over a secured socket to send an e-mail. The application uses the GPRS interface for the SMTP transfer.

This Application Note presents the way to switch ON and switch OFF the Sierra Wireless AirPrime embedded modules, without any external microcontroller, just with the main power supply, in order to be able to wake up again when entering into alarm mode.

This application note describes the process and steps required to register and add units to the APMS server to make them available for use by a customer. This application note walks a user through the initial steps to getting up and running. If problems are encountered beyond this, support should be sought from your usual support channel.

This application note presents different antenna diagnosis solutions including their inherent limitations and different degrees of antenna default detection. Antenna diagnosis can be used to improve the reliability of a GSM link in the case of a main antenna failure by switching to a secondary one. Diagnosis can also be used as part of a production testing to check the complete connection from the GSM device to the antenna. The final part focuses on practical implementations of using an antenna with an integrated resistor.

This Application Note describes the general structure of the Real Time Operating System implemented in Sierra Wireless modules, the RTOS features extended to developers and their restrictions, limitations and best practices to be followed when using the RTOS features.

This application note describes how to design a dual SIM solution. This function is used to switch between two SIMs. Two GPIOs are used to control the hardware switching between two SIMs.

AT Command Parser source code demonstrates and provides re-usable code showing how to subscribe and parser responses to both unsolicted and sent AT commands.