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 reviews each objective with its associated requirements and then details design rules for successful Sierra Wireless mobile devices integration, with a particular focus on PCB design. It is recommended to read this application note before starting a design as its provided guidance can contribute to save time and money by reducing the number of PCB iterations before final certification and market introduction.

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.

The Antenna Switch function enables switching between two antennas and can be implemented on customer application.This application note describes how to design a GSM antenna switch, from component selection to PCB implementation. This switching function can be used with an antenna detection system.

GPS receivers of Sierra Wireless AirPrime modules can be connected to a passive antenna (which should be physically located very close to the unit) or a remote active antenna containing an LNA, which will both improve SNR and compensate for any cable/insertion losses. This application note describes the use of the integrated GPS active antenna powering function when available, and how to design an external powering circuit where required.

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 perform voice over IP using PCM (for 3G modules) and AMR (for 2G modules).

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 FTP over SSL (FTPS) application note shows how to interact with an FTPS server through GPRS to perform an FTP PUT and FTP READ action.

The purpose of this application note is to provide a first level of suitable information to select and implement a power supply solution for a GSM application.

This Application Note describes methods and services through which an application will be able to perform a Geolocation operation through the use of purely CellID’s without the need for GPS.

This application note explains how to set up an SSL-secured communications channel with an Apache server.

The Open AT Source code example allows to use the file system to store application data using AT commands.

This document gives examples on how to perform extended FTP functions (such as file delete, get file size, file listing and resume download) on the Internet Application with TCP sockets.

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

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 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.