Introduction | Siemens Mux_guide_v06 instruction

Multiplexer User's Guide

Confidential / Released

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mobile

1 Introduction

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 the customer.

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 [5].

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Siemens Mux_guide_v06 manual Introduction

Contents

Version DocID Muxguidev06 Siemens Cellular Engines June 30 Document Name Multiplexer Users GuideMultiplexer Users Guide Muxguidev06 Contents Tables Multiplexer protocol version control Chapter What is new Document history Introduction Supported products and related documents References Term and abbreviations Abbreviation Description Multiplexer protocol an overview Product concept and architecture Virtual channels and AT commands Basic requirements CharacteristicsIntegrating multiplexer into the customer application Restrictions Functions without channel dependencies Timing conditions Logical flow control Multiplexer control and signaling linesFlow control RTS/CTS on the physical channels RTS/CTS on the logical channels COM M COM N COM P RTS/CTS Power saving Bandwidth of logical channelsEscape sequence Structure of the multiplexer protocol Introduction of the multiplexer protocolData link layer Flag sequence Address field Control field Frame Type Frame checking sequence field FCS Length indicatorInformation field Bit State diagrams Relationship between the customer µC and the GSM engine µC Serial Interface Customer GSM engine AT+CMUX Serial interface Customer µC GSM engine CustomerEngine Responder Multiplexer control channel Close-down procedureDLC release Type field Test command Test Multiplexer close down CLDLength field Modem status command MSC Break signal optional Bit Not supported Type Bit Power saving control PSCCommands Bit Description Value octet Length=1 Bit Non-supported command Non-supported command response NSCValue octet Bit Command Type No Value octet Length=0 Customer GSM engine µC AT+CMUX Multiplexer protocol version control Introduction Signals Bit Modem status command MSCSignals Break Signals Octet Optional Command Bit Multiplexer protocol versions Troubleshooting Implementing version control Coding of TestCommand message Example of TestCommand message