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Mux_guide_v06 manual
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36 pages, 1.05 Mb
User’s Guide
Multiplexer User's Guide
Siemens Cellular Engines
Version: 06
DocID: Mux_guide_v06
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