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User’s Guide Multiplexer User's Guide Siemens Cellular Engines Version: 06 DocID: Mux_guide_v06.
Multiplexer User's Guide Confidential / Released s m o b i l e Mux_guide_v06 Page 2 of 36 30.06.2004 Document Name: Multiplexer User's Guide Version: 06 Date: June 30, 2004 DocId: Mux_guide_v06 Status: Confidential / Released General notes Product is deemed accepted by Recipient and is provided without interface to Recipient’s products.
Multiplexer User's Guide Confidential / Released s m o b i l e Mux_guide_v06 Page 3 of 36 30.06.2004 Contents 0 Document history.......................................................................................................... 5 1 Introduction .
Multiplexer User's Guide Confidential / Released s m o b i l e Mux_guide_v06 Page 4 of 36 30.06.2004 5 Multiplexer protocol version control ......................................................................... 33 5.1 Introduction ............
Multiplexer User's Guide Confidential / Released s m o b i l e Mux_guide_v06 Page 5 of 36 30.06.2004 0 Document history This chapter reports modifications and improv ements over previous versions of this document.
Multiplexer User's Guide Confidential / Released s m o b i l e Mux_guide_v06 Page 6 of 36 30.06.2004 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.
Multiplexer User's Guide Confidential / Released s m o b i l e Mux_guide_v06 Page 7 of 36 30.06.2004 1.1 Supported products and related documents Supported products • AC43 • AC45 • MC35i .
Multiplexer User's Guide Confidential / Released s m o b i l e Mux_guide_v06 Page 8 of 36 30.06.2004 1.3 Term and abbreviations Abbreviation Description CSD Circuit Switched Data CTS Clear to Sen.
Multiplexer User's Guide Confidential / Released s m o b i l e Mux_guide_v06 Page 9 of 36 30.06.2004 2 Multiplexer protocol – an overview 2.1 Product concept and architecture The multiplexer mode enables one serial interface to transmit data to three different custo- mer applications.
Multiplexer User's Guide Confidential / Released s m o b i l e Mux_guide_v06 Page 10 of 36 30.06.2004 2.2 Virtual channels and AT commands Please note that a cellular engine designed for multiplex operation does not include three different devices.
Multiplexer User's Guide Confidential / Released s m o b i l e Mux_guide_v06 Page 11 of 36 30.06.2004 3 Integrating multiplexer into the customer application When designing a multiplexer application, you can create your own sources or take advantage of the sources delivered upon reques t by Siemens.
Multiplexer User's Guide Confidential / Released s m o b i l e Mux_guide_v06 Page 12 of 36 30.06.2004 3.1.3 Dependencies between multiplexer channels and restrictions of use When using the following functions, be aware of possible dependencies between the different channels.
Multiplexer User's Guide Confidential / Released s m o b i l e Mux_guide_v06 Page 13 of 36 30.06.2004 3.1.5 Timing conditions Switching on the multiplexer with AT+CMUX=0 causes a 5s timer to start. If the multiplexer control channel is not established within this time, the module returns to “normal AT command mode” without multiplexer.
Multiplexer User's Guide Confidential / Released s m o b i l e Mux_guide_v06 Page 14 of 36 30.06.2004 3.2 Multiplexer control and signaling lines The following chapter covers all information you need to develop and set up a virtual driver. Differences and restrictions in comparison to the unframed module are pointed out.
Multiplexer User's Guide Confidential / Released s m o b i l e Mux_guide_v06 Page 15 of 36 30.06.2004 RTS/CTS on the logical channels The customer application needs to regulate the data flow according to the logical flow control. The implementation of the WinMux 2k is a good example.
Multiplexer User's Guide Confidential / Released s m o b i l e Mux_guide_v06 Page 16 of 36 30.06.2004 3.2.2 Escape sequence When the multiplexer protocol is active only coded data is transmitted over the UART. The coding includes a header and a checksum.
Multiplexer User's Guide Confidential / Released s m o b i l e Mux_guide_v06 Page 17 of 36 30.06.2004 Addre ss 1 Octet Control 1 Octet Flag 1 Octet 0xF9 DLCI DLCI: Data Link Connection Identifier.
Multiplexer User's Guide Confidential / Released s m o b i l e Mux_guide_v06 Page 18 of 36 30.06.2004 4.2.1 Flag sequence A flag sequence is a specific bit pattern (usually 11111001; hexadecimal: 0xF9) used to mark the beginning and the end of a frame of data.
Multiplexer User's Guide Confidential / Released s m o b i l e Mux_guide_v06 Page 19 of 36 30.06.2004 4.2.3 Control field The control field contains control information to define the frame.
Multiplexer User's Guide Confidential / Released s m o b i l e Mux_guide_v06 Page 20 of 36 30.06.2004 4.2.4 Length indicator The length indicator specifies the length of the following information field. As the maximum frame size N1 is 98 bytes and cannot be changed the E/A bit is always 1.
Multiplexer User's Guide Confidential / Released s m o b i l e Mux_guide_v06 Page 21 of 36 30.06.2004 4.3 State diagrams The multiplexer protocol is based on two state machines (see Figure 4). One state machine initiates the setup of the logical channels, the other one responds to the requests.
Multiplexer User's Guide Confidential / Released s m o b i l e Mux_guide_v06 Page 22 of 36 30.06.2004 Figure 4: Relationship between the customer µC and the GSM engine µC DI S- CONNECT ED DI S-.
Multiplexer User's Guide Confidential / Released s m o b i l e Mux_guide_v06 Page 23 of 36 30.06.2004 Cus t omer µC GSM e n gi n e µC Clos ed Dow n Cl o se d Do wn Request St art Up ResponseSt .
Multiplexer User's Guide Confidential / Released s m o b i l e Mux_guide_v06 Page 24 of 36 30.06.2004 C ustom er µC G SM engi ne µC Dis connect ed Di sc onnect ed Ser i a l i nt e r f a ce DLC .
Multiplexer User's Guide Confidential / Released s m o b i l e Mux_guide_v06 Page 25 of 36 30.06.2004 4.3.1 Start-up procedure The only approach to activate the multiplexer protocol is entering the appropriate AT command AT+CMUX=0. This enables the multiplexer control channel.
Multiplexer User's Guide Confidential / Released s m o b i l e Mux_guide_v06 Page 26 of 36 30.06.2004 4.3.4 DLC release No provision is made to repeat the request if no response is received. Customer µC GSM engine DISC: P = 1 UA: F = 1 DM : F = 1 respondi ng s t ati on i s al ready disconnect ed Figure 9: DLC release 4.
Multiplexer User's Guide Confidential / Released s m o b i l e Mux_guide_v06 Page 27 of 36 30.06.2004 Length field: Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 Bit 8 EA L1 L2 L3 L4 L5 L6 L7 EA bit: Extension bit. In t he last octet of the sequence the EA bit = 1, otherw ise = 0.
Multiplexer User's Guide Confidential / Released s m o b i l e Mux_guide_v06 Page 28 of 36 30.06.2004 4.3.9 Modem status command (MSC) The Modem Status Command is used for software flow control.
Multiplexer User's Guide Confidential / Released s m o b i l e Mux_guide_v06 Page 29 of 36 30.06.2004 Note: The mappings are valid for version 3 and an MSC request only. Descriptions of all other versions are available in Chapter 5. The response to any MSC must be always the same data already sent.
Multiplexer User's Guide Confidential / Released s m o b i l e Mux_guide_v06 Page 30 of 36 30.06.2004 4.3.10 Power saving control (PSC) The power saving control message uses the following type field octet: Type: Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 Bit 8 1 C/R 0 0 0 0 1 0 C/R bit: Indicates whether the sequence is a command or a response.
Multiplexer User's Guide Confidential / Released s m o b i l e Mux_guide_v06 Page 31 of 36 30.06.2004 No Value octet (Length=0) Switches into SLEEP mode, like AT+CFUN=0 Note: According to the GSM 07.10 standard PSC supports no value octets. The optional value octet was added to increase flexibility.
Multiplexer User's Guide Confidential / Released s m o b i l e Mux_guide_v06 Page 32 of 36 30.06.2004 4.4 Example: Establishing logical channels without parameter negotiation • Send AT+CMUX=0; .
Multiplexer User's Guide Confidential / Released s m o b i l e Mux_guide_v06 Page 33 of 36 30.06.2004 5 Multiplexer protocol version control 5.1 Introduction The multiplexer protocol offers a ver.
Multiplexer User's Guide Confidential / Released s m o b i l e Mux_guide_v06 Page 34 of 36 30.06.2004 5.2 Multiplexer protocol versions This section summarizes the differences of the existing multiplexer protocol versions. 1. No version check • No break signal is sent 2.
Multiplexer User's Guide Confidential / Released s m o b i l e Mux_guide_v06 Page 35 of 36 30.06.2004 5.3 Implementing version control The TE initiates the version check by sending the Test command via the multiplexer control channel DLCI 0 (with TEMUX_Version).
Multiplexer User's Guide Confidential / Released s m o b i l e Mux_guide_v06 Page 36 of 36 30.06.2004 5.3.2 Coding of “TestCommand” message The coding of the multiplexer stack version is used specifically for SIEMENS equipment and is not defined in ETSI standards.
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