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Multiplexer User's Guide

Confidential / Released

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Mux_guide_v06

Page 23 of 36

30.06.2004

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

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Summary of Contents for AC43

Page 1: ...User s Guide Multiplexer User s Guide Siemens Cellular Engines Version 06 DocID Mux_guide_v06 ...

Page 2: ... followed Siemens or its suppliers shall regardless of any legal theory upon which the claim is based not be liable for any consequential incidental direct indirect punitive or other damages whatsoever including without limitation damages for loss of business profits business interruption loss of business information or data or other pecuniary loss arising out the use of or inability to use the Do...

Page 3: ...if applicable 13 3 2 Multiplexer control and signaling lines 14 3 2 1 Flow control 14 3 2 2 Escape sequence 16 3 3 Power saving 16 3 4 Bandwidth of logical channels 16 4 Structure of the multiplexer protocol 17 4 1 Introduction of the multiplexer protocol 17 4 2 Data link layer 17 4 2 1 Flag sequence 18 4 2 2 Address field 18 4 2 3 Control field 19 4 2 4 Length indicator 20 4 2 5 Information field...

Page 4: ...ngine µC 22 Figure 5 MPI Startup DLC establishment and information transfer 23 Figure 6 MP DLC release and close down 24 Figure 7 DLC establishment 25 Figure 8 Information transfer 25 Figure 9 DLC release 26 Figure 10 Multiplexer control channel 26 Figure 11 Modem status command MSC 28 Figure 12 Power Saving Control PSC 30 Figure 13 Establishing the multiplexer control channel and the logical chan...

Page 5: ...not supported 4 3 5 Corrected description of Close down procedure 5 Corrected description of multiplexer version control 5 3 3 Corrected example Preceding document Multiplexer User s Guide Version 04 New document Multiplexer User s Guide Version 05 Chapter What is new 1 1 Added further supported products 3 1 4 Modified remark on AT W 3 1 6 Added chapter Operation of a second physical serial interf...

Page 6: ...n 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 Multiplexe...

Page 7: ...pplied with your GSM engine 4 Remote SAT User s Guide 5 Multiplexer Driver Developer s Guide for Windows 2000 and Windows XP 6 Multiplexer Driver Installation Guide for Windows 2000 and Windows XP For further documents regarding your GSM engine please refer to the latest Release Notes supplied with the module To visit the Siemens Website you can use the following link http www siemens com wm 1 2 R...

Page 8: ... Ready DTR Data Terminal Ready FC Flow Control FFC Flat Flex Cable GPRS General Packet Radio Service GSM Global System of Mobile Communication IEI Information Element Identifier IP Internet Protocol MO Mobile originated MP Multiplexer Protocol MS Mobile Station MSDN Microsoft Developer Network MT Mobile terminated MUX Multiplexer OS Operating System PC Personal Computer PSC Power saving control RT...

Page 9: ...an be created with the multiplexer This is of great advantage when several independent electronic devices or interfaces are used To access the three virtual interfaces both the GSM engine and the customer application must contain Mux components which communicate over the multiplexer protocol In multiplexer mode AT commands and data are encapsulated into packets Each packet has a channel identifica...

Page 10: ...incoming outgoing SMS incoming outgoing GPRS connection Phonebook management AT commands Channel 1 2 Channel 2 3 2 1 indicates that the functionality is available on the channel indicates that the functionality is not available on the channel 1 except for AT commands related to data and fax calls 2 only two channels can be used parallel to transmit GPRS data Examples While a data call is in progre...

Page 11: ...ed whenever the module is powered up again In this case the multiplexer fails to start To avoid this it is recom mended to re synchronize all settings before using the multiplexer mode again Before closing the multiplexer make sure that there is no ongoing activity on one of the channels For example check that voice CSD or GPRS connections have ended and wait until all pending AT command responses...

Page 12: ...essage text which may be specific to each channel The URC CALA will be issued only on the channel where the last alarm setting was made For details see 2 Device locks set with AT CLCK SIM card access RF settings Example An ongoing fax call has been established on channel 1 When answering an incoming voice call on channel 2 or 3 and terminating it the held fax call will be ended as well 3 1 4 Funct...

Page 13: ...ook may cause problems if a fax transmission is ongoing at the same time When switching on the module after a firmware update we recommend to wait 5 seconds before entering the first AT command 3 1 6 Operation of a second physical serial interface ASC1 if applicable This chapter applies only to Siemens GSM modules equipped with a second physical serial interface referred to as ASC1 If your product...

Page 14: ...As already pointed out the logical flow control operates like RTS CTS but with FC BIT on every channel The RTS CTS are not used for flow control because the traffic on the logical channels may cause a temporary loss of bandwidth on another channel This behavior has no impact on the handshake V 24 lines RTS CTS on the physical channels Hardware flow control AT Q3 is recommended for use with multipl...

Page 15: ...flow Figure 2 Logical flow control and RTS CTS signaling behind the decoder RING DCD Unlike all other lines DCD and RING are transmitted additionally on the UART directly by the module These signals are logical ORs from the three logical channel status lines However the customer application must carefully decide how to handle these lines and ensure that no conflicts occur between the different cha...

Page 16: ...e AT CFUN command which provides the choice of the functionality levels fun 0 1 5 6 7 or 8 For further details on power saving see 1 and 2 If the module is in multiplexer mode it is not recommended to activate SLEEP mode with AT CFUN n For products supporting Multiplexer Protocol version 3 the best approach to properly control SLEEP mode in this case is to issue the PSC messages described in Chapt...

Page 17: ...plexer protocol 4 1 Introduction of the multiplexer protocol The supported multiplexer protocol conforms to the GSM 07 10 Multiplexer Protocol The non error recovery mode was implemented with the basic option The frames have a start and a stop byte A checksum is calculated to protect the transferred data Frame repetition is not enabled Data and fax calls are transferred in the logical channel DLCI...

Page 18: ...for the Data Link Connection Identifier DLCI are dynamically defined apart from DLCI 0 DLCI DLCI Data Link Connection Identifier C R Command Response EA extension bit EA 1 EA C R Table 3 Assignment of the DLCI DLCI number decimal Priority Multiplexer control channel see chapter 4 3 6 0 0 highest priority AT commands data fax GPRS 1 7 AT commands GPRS 2 3 7 The command response bit identifies the f...

Page 19: ...1 2 3 4 5 6 7 8 SABM set asynchronous balanced mode 1 1 1 1 P F 1 0 0 UA unnumbered acknowledgement 1 1 0 0 P F 1 1 0 DM disconnected mode 1 1 1 1 P F 0 0 0 DISC disconnect 1 1 0 0 P F 0 1 0 UIH unnumbered information with header check 1 1 1 1 P F 1 1 1 P F Poll Final bit Commands P 1 Responses F 1 For each DLCI only one frame with P 1 may ever be expected Table 5 Coding of the control field ...

Page 20: ...ne octet for the Length Indicator E A 0 two octets for the Length Indicator 4 2 5 Information field The information field contains the data and has an octet structure The field only exists for UIH frames unnumbered information with header check To transfer information fields the P F bit is set to 0 a response is not necessarily expected 4 2 6 Frame checking sequence field FCS The Frame Checking Se...

Page 21: ...nd immediately have the option of setting up the multiplexer control channel DLCI 0 and other logical channels The logical channels are then set up DLC establishment If the DLC has been established successfully the state machine for that particular channel changes to CONNECTED If the request is unsuccessful the logical channel cannot be established and the state machine remains in DISCONNECTED on ...

Page 22: ...ION CONNECTED CLOSED DOW N Start Up DLC Establishm ent Close Down Close Down Close Down DLC param eter negotiation DLC Release Inform ation Transfer DIS CONNECTED DIS CONNECTED NEGOTIATION CONNECTED CLOSED DOW N Start Up DLC Establishm ent Close Down Close Down Close Down DLC param eter negotiation DLC Release Inform ation Transfer Customer µC Master state machine GSM engine µC Slave state machine...

Page 23: ...sconnected Serial interface Start Up AT CMUX Connected RequestSABM IndicationSABM ResponseDM ConfirmDM DLC Establishment DLC created Disconnected Disconnected RequestSABM IndicationSABM ResponseUA ConfirmUA DLC Establishment DLC not created Connected Connected Connected Connected RequestUIH IndicationUIH IndicationUIH RequestUIH Connected Information Transfer Figure 5 MPI Startup DLC establishment...

Page 24: ...cted Serial interface DLC Release Connected Connected RequestDISC IndicationDISC ResponseUA ConfirmUA RequestCloseDown IndicationCloseDown ResponseCloseDown ConfirmCloseDown Close Down Closed Down Disconnected Disconnected Negotiation Connected Closed Down Disconnected Disconnected Negotiation Connected Figure 6 MP DLC release and close down ...

Page 25: ...ither with a UA frame if the DLCI was set up or with a DM frame if the DLCI was not set up No provision is made for repeating the request if a response is not received The state machine requesting the multiplexer control channel DLCI 0 is the initiating station while the other is called the responding station Customer µC GSM engine SABM P 1 Address Field DLCI of channel to be established UA F 1 DL...

Page 26: ...he initiating station and the responding station revert to AT command mode Before closing the multiplexer make sure that there is no ongoing activity on one of the channels For example check that voice CSD or GPRS connections have ended and wait until all pending AT command responses are received 4 3 6 Multiplexer control channel DLCI 0 Type 1 Octet Length n Octets Value 1 1 Octet Value 2 1 Octet ...

Page 27: ...nds can be sent in a single frame only 4 3 7 Multiplexer close down CLD Type field Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 Bit 8 1 C R 0 0 0 0 1 1 Length byte 0 no value octet 4 3 8 Test command Test The test command is intended to test the connection between MS and TE Type field Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 Bit 8 1 C R 0 0 0 1 0 0 The length byte indicates the number of test bytes ...

Page 28: ...V 24 signals Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 Bit 8 1 FC RTC RTR reserved 0 reserved 0 RING DCD FC bit Flow control included in all multiplexer versions FC 1 no frames are accepted The following bits for V24 status lines as described in this chapter are included in multiplexer protocol version 3 only However if you wish to use the advantages of this version it is absolutely necessary to s...

Page 29: ...n control handshake see Chapter 5 More detailed information on older multiplexer versions are available in Chapter 5 2 Break signal optional Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 Bit 8 1 Not supported Usually the break signal octet carries information about a break condition detected from the host application in the data stream for the DLC Note This command supports no parameters Instead we us...

Page 30: ...arameter value In commands Bit 1 Bit 2 Bit 3 Bit 4 Description 0 0 0 0 Switches to the same mode as without a value octet 1 0 0 0 Switches into full functionality mode like AT CFUN 1 0 1 0 0 Switches into NON CYCLIC SLEEP mode like AT CFUN 0 1 1 0 0 Switches into CYCLIC SLEEP mode like AT CFUN 5 0 0 1 0 Switches into CYCLIC SLEEP mode like AT CFUN 6 1 0 1 0 Switches off like AT SMSO 0 1 1 0 Resets...

Page 31: ... received URC the logical ring line has been activated for 1 second and deactivated again Please note that the behavior of the logical ring line is identical with the behavior of the physical RING0 line described in 1 4 3 11 Non supported command response NSC This response is sent whenever a command type is not supported by the receiving entity Type field Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 ...

Page 32: ...Transfer Customer µC Closed Down Closed Down RequestStartUp ResponseStartUp ConfirmStartUp IndicationStartUp Disconnected Disconnected Serial interface Start Up AT CMUX Connected DLCI 0 DLC Establishment Create DLCI 0 Disconnected DLCI 0 Disconnected DLCI 0 RequestSABM DLCI 0 IndicationSABM DLCI 0 ResponseUA DLCI 0 ConfirmUA DLCI 0 Connected DLCI 0 Connected DLCI 1 DLC Establishment Create DLCI 1 ...

Page 33: ...ultiplexer protocol the lower version will be agreed upon If no version check is done the TE reverts due to lack of version information to multiplexer version 1 This means that both sides only agree on version 1 even though they may have the same and even higher version The TE and MS multiplexer version numbers can be traced on the serial interface They appear as follows TE version e g version 1 T...

Page 34: ... from module to host after version check on every channel to signal the initial state Modem status command MSC Command 1 octet Length 1 octet DLCI 1 octet V 24 signals 1 octet Break Signals optional 1 octet Command Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 Bit 8 1 C R 0 0 0 1 1 1 Figure 14 MSC as used in version 3 Version specific differences in handling the modem status command MSC are explained ...

Page 35: ...multiplexer protocol version 5 3 1 Troubleshooting When the MS realizes the implemented software but the TE does not respond correctly the following errors might occur The Request Test message is not sent from the TE No version check takes place No retransmission for Request Test message is triggered The multiplexer starts with protocol version 1 because no version information was exchanged betwee...

Page 36: ...N MSMUXVERSION send as ASCII 3 Version Number 1 999 send as ASCII The message part after the Version IEI is coded with ASCII characters This allows to read the version information from the trace file The version number must have a value between 1 999 If not all digits of the version number are used only the used digits are coded as ASCII sign s Digits that are not used are sent as zero string in t...

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