This application note describes how to design a Dual SIM solution without using the SIM detection pin of the module.

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

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 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)

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 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 provides a schematic diagram example of a PCM codec for the AirPrime SL series.

This document gives an overview on using a private DNS server to resolve domain name on an AirPrime module.

Data communication from Sierra Wireless modules is done through the Data layer, which is a part of the firmware. AirPrime module support both Fax class 1 and class 2. They are implemented as a library in the Data layer. The Fax library manages all Fax related operations for the module.

This application note describes how to power ON and power OFF the AirPrime module’s SIM interface for SIM electrical tests (GSM11.11).