Multiplexer User's Guide
Confidential / Released
Siemens GSM engines support the basic option of the multiplexer according to the
ETSI TS 101 369, GSM 07.10 Multiplexer Protocol. This allows a mobile to run a triple
session over a serial link interface. Outside the GSM engine, on the application side of the
serial interface, another multiplexer must be integrated in order to demultiplex the signal and
distribute it on the three virtual channels. The external multiplexer needs to be provided by
This document describes how to use the multiplexer and then explains how to design an
external multiplexer and integrate it into an application on top of a Siemens GSM engine.
Multiplexer protocol sources (WinMux2k), provided by Siemens AG, can be obtained on
request from your local distributor. For more detailed information please refer to .
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