> 1 | Introduction

> The multiplex mode according to the 3G TS 101 369, GSM 07.10 Multiplexer protocol enables one physical serial interface to be partitioned into three virtual channels. This allows you to take advantage of three sessions running simultaneously on one serial interface. For example, you can send or receive data on the first multiplexer channel, while the remaining channels stay in AT command mode.
> In order to properly communicate with the wireless modem, the application needs to support the Multiplexer Protocol and 3 virtual ports must be installed. For this purpose the ready-to-use multiplexer driver WinMux can be provided for Microsoft® Windows XP™ and Microsoft® Windows Vista™. The driver offers basic multiplexer functionality and serves as a reference implementation to aid developers and system integrators in designing, developing and testing customized multiplexer applications. As such, it has been tested by Siemens using a variety of applications and platforms, but naturally, even the most extensive test setup can never be adequate to cover all conceivable configurations.
> This document1 describes how to install the WinMux driver on Windows XP and Windows Vista.
> The Siemens AG does not guarantee any support regarding the integration of the driver into a customer’s application. However, the code binaries and source files of WinMux can be supplied on request and used for further development. Please contact your local distributor to obtain the software and the documentation.

> 1
> The document is effective only if listed in the appropriate Release Notes as part of the technical documentation delivered with your Siemens wireless product.