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Siemens Mux_guide_v06 Customer C, GSM engine C, Serial interface

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Multiplexer User's Guide

Confidential / Released

mo b i l e

Mux_guide_v06 Page 23 of 36 30.06.2004

CustomerµCGSM engineµC

Closed Down Closed Down

RequestStartUp

ResponseStartUp

ConfirmSt artUp

IndicationStartUp

DisconnectedDisconnected

Serialinterface

Start Up

"AT+CMUX"

Connected

RequestSABM IndicationSABM

ResponseDM

ConfirmDM

DLC Establishment,

DLC created

DisconnectedDisconnected

RequestSABM IndicationSABM

ResponseUA

ConfirmUA

DLC Establishment,

DLC not created

ConnectedConnected

RequestUIH IndicationUI H

IndicationUIH

RequestUIH

Connected

Information

Transfer

Figure 5: MPI – Startup, DLC establishment and information transfer

Contents

Main Users Guide Multiplexer User's Guide Multiplexer User's Guide Confidential / Released Mux_guide_v06 Page 2 of 36 30.06.2004 Contents Figures Tables 0 Document history 1 Introduction 1.1 Supported products and related documents 1.2 References 1.3 Term and abbreviations 2 Multiplexer protocol an overview 2.1 Product concept and architecture 2.2 Virtual channels and AT commands 3 Integrating multiplexer into the customer application 3.1 Characteristics 3.1.1 Basic requirements 3.1.2 Restrictions 3.1.3 Dependencies between multiplexer channels and restrictions of use 3.1.4 Functions without channel dependencies 3.1.5 Timing conditions 3.1.6 Operation of a second physical serial interface ASC1 (if applicable) 3.2 Multiplexer control and signaling lines 3.2.1 Flow control Page 3.2.2 Escape sequence 3.3 Power saving 3.4 Bandwidth of logical channels 4 Structure of the multiplexer protocol 4.1 Introduction of the multiplexer protocol 4.2 Data link layer 4.2.1 Flag sequence 4.2.2 Address field 4.2.3 Control field 4.2.4 Length indicator 4.2.5 Information field 4.2.6 Frame checking sequence field (FCS) 4.3 State diagrams Figure 4: Relationship between the customer C and the GSM engine C Customer C Master state machine GSM engine C Slave state machine Customer C GSM engine C Figure 5: MPI Startup, DLC establishment and information transfer Serial interface Customer C GSM engine C Serial i nterface 4.3.1 Start-up procedure 4.3.2 DLC establishment Customer C GSM engine 4.3.3 Information transfer Customer C (Initiator) GSM engine (Responder) Customer C GSM engine 4.3.5 Close-down procedure 4.3.6 Multiplexer control channel Information Field 4.3.7 Multiplexer close down (CLD) 4.3.8 Test command (Test) 4.3.9 Modem status command (MSC) Page 4.3.10 Power saving control (PSC) 4.3.11 Non-supported command response (NSC) Multiplexer User's Guide Confidential / Released 4.4 Example: Establishing logical channels without parameter negotiation Customer C Serial interface GSM engine C Figure 13: Establishing the multiplexer control channel and the logical channel 5 Multiplexer protocol version control 5.1 Introduction 5.2 Multiplexer protocol versions 5.3 Implementing version control 5.3.1 Troubleshooting 5.3.2 Coding of TestCommand message 5.3.3 Example of TestCommand message