Siemens Mux_guide_v06, AC43, AC45, MC35i, MC39i User Manual

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User’s Guide

Multiplexer User's Guide

Siemens Cellular Engines

Version: 06 DocID: Mux_guide_v06

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Document Name:

Multiplexer User's Guide

Version:

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.

The documentation and/or Product are provided for testing, evaluation, integration and information purposes. The documentation and/or Product are provided on an “as is” basis only and may contain deficiencies or inadequacies. The Documentation and/or Product are provided without warranty of any kind, express or implied. To the maximum extent permitted by applicable law, Siemens further disclaims all warranties, including without limitation any implied warranties of merchantability, completeness, fitness for a particular purpose and non-infringement of third-party rights. The entire risk arising out of the use or performance of the Product and documentation remains with Recipient. This Product is not intended for use in life support appliances, devices or systems where a malfunction of the product can reasonably be expected to result in personal injury. Applications incorporating the described product must be designed to be in accordance with the technical specifications provided in these guidelines. Failure to comply with any of the required procedures can result in malfunctions or serious discrepancies in results. Furthermore, all safety instructions regarding the use of mobile technical systems, including GSM products, which also apply to cellular phones must be 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 Documentation and/or Product, even if Siemens has been advised of the possibility of such damages. The foregoing limitations of liability shall not apply in case of mandatory liability, e.g. under the German Product Liability Act, in case of intent, gross negligence, injury of life, body or health, or breach of a condition which goes to the root of the contract. However, Claims for Damages arising from a breach of a condition which goes to the root of the contract shall be limited to the foreseeable damage which is intrinsic to the contract, unless caused by intent or gross negligence or based on liability for injury of life, body or health. The above provision does not imply a change on the burden of proof to the detriment of the Recipient. Subject to change without notice at any time. The interpretation of this general note shall be governed and construed according to German law without reference to any other substantive law.

Transmittal, reproduction, dissemination and/or editing of this document as well as utilization of its contents and communication thereof to others without express authorization are prohibited. Offenders will be held liable for payment of damages. All rights created by patent grant or registration of a utility model or design patent are reserved.

Trademark notice

MS Windows



is a registered trademark of Microsoft Corporation.

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Contents

0 Document history..........................................................................................................5

1 Introduction ...................................................................................................................6

1.1 Supported products and related documents..........................................................7

1.2 References ............................................................................................................7

1.3 Term and abbreviations .........................................................................................8

2 Multiplexer protocol – an overview .............................................................................9

2.1 Product concept and architecture ..........................................................................9

2.2 Virtual channels and AT commands ....................................................................10

3 Integrating multiplexer into the customer application ............................................ 11

3.1 Characteristics .....................................................................................................11

3.1.1 Basic requirements ................................................................................11

3.1.2 Restrictions ............................................................................................11

3.1.3 Dependencies between multiplexer channels and restrictions of use ...12

3.1.4 Functions without channel dependencies..............................................12

3.1.5 Timing conditions...................................................................................13

3.1.6 Operation of a second physical serial interface ASC1 (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 .....................................................................................20

4.2.6 Frame checking sequence field (FCS)...................................................20

4.3 State diagrams.....................................................................................................21

4.3.1 Start-up procedure.................................................................................25

4.3.2 DLC establishment.................................................................................25

4.3.3 Information transfer................................................................................ 25

4.3.4 DLC release...........................................................................................26

4.3.5 Close-down procedure........................................................................... 26

4.3.6 Multiplexer control channel ....................................................................26

4.3.7 Multiplexer close down (CLD) ................................................................ 27

4.3.8 Test command (Test).............................................................................27

4.3.9 Modem status command (MSC) ............................................................ 28

4.3.10 Power saving control (PSC)...................................................................30

4.3.11 Non-supported command response (NSC)............................................31

4.4 Example: Establishing logical channels without parameter negotiation ..............32

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5 Multiplexer protocol version control.........................................................................33

5.1 Introduction ..........................................................................................................33

5.2 Multiplexer protocol versions ...............................................................................34

5.3 Implementing version control...............................................................................35

5.3.1 Troubleshooting .....................................................................................35

5.3.2 Coding of “TestCommand” message .....................................................36

5.3.3 Example of “TestCommand” message ..................................................36

Figures

Figure 1: Multiplexer architecture ............................................................................................. 9

Figure 2: Logical flow control and RTS/CTS signaling behind the decoder ........................... 15

Figure 3: Data link layer .........................................................................................................17

Figure 4: Relationship between the customer µC and the GSM engine 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 channel ................... 32

Figure 14: MSC as used in version 3 ..................................................................................... 34

Tables

Table 1: Comparison of multiplexer channels ........................................................................ 10

Table 2: Address field.............................................................................................................18

Table 3: Assignment of the DLCI ...........................................................................................18

Table 4: Use of the command/response bit............................................................................ 18

Table 5: Coding of the control field......................................................................................... 19

Table 6: Version differences for MSC ....................................................................................34

Table 7: IEI coding .................................................................................................................36

Table 8: Coding of “TestCommand” (Example)...................................................................... 36

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0 Document history

This chapter reports modifications and improvements over previous versions of this document.

Preceding document: “Multiplexer User's Guide” Version 05 New document: “Multiplexer User's Guide” Version 06

Chapter What is new

1.1 Added further supported products.

3.1.1 Added note about closing Multiplexer.

3.1.2 Added note about maximum frame size N1.

4.2.4 Second byte for frame size greater than 127 bytes is 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 interface ASC1 (if applicable)”

Preceding document: “Multiplexer User's Guide” Version 03 New document: “Multiplexer User's Guide” Version 04

Chapter What is new

1.1 Added further supported products.

3 - 3.4 Restructured and revised all chapters.

3.1.2, 3.3,

4.3.10

To control SLEEP mode use PSC messages rather than entering AT+CFUN=<n>

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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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1.1 Supported products and related documents

Supported products

• AC43

• AC45

• MC35i

• MC35i Terminal

• MC39i

• MC45

• MC46

• MC388

• MC5x

• TC35i

• TC35i Terminal

• TC45

• XT55

Related documents [1] Hardware Interface Description supplied with your GSM engine [2] AT Command-Set supplied with your GSM engine [3] Release Notes supplied 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 References

[1] Digital Cellular Telecommunications Systems (Phase 2+); Terminal Equipment to

Mobile Station (TE-MS) "Multiplexer Protocol"; ETSI TS 101 369 V7.1.0 (1999-11), GSM 07.10 Version 7.1.0, Release 199

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1.3 Term and abbreviations

Abbreviation Description

CSD Circuit Switched Data

CTS Clear to Send

DCD Data Carrier Detect

DLCI Data Link Control Identifier

DSB Developer Support Box

DSR Data Set 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

RTS Request to Send

TE Terminal Equipment

UART Universal Asynchronous Receiver Transmitter

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2 Multiplexer protocol – an overview

2.1 Product concept and architecture

The multiplexer mode enables one serial interface to transmit data to three different customer applications. This is achieved by providing three virtual channels using a multiplexer (Mux).

This is especially advantageous when a fax/data/GPRS call is ongoing. Using the multiplexer features, e.g. controlling the module or using the SMS service can be done via the additional channels without disturbing the data flow; access to the second UART is not necessary. Furthermore, several accesses to the module can 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 identification and may vary in length.

Note:

All statements regarding GPRS are valid only for Siemens wireless products capable of GPRS.

Figure 1: Multiplexer architecture

Terminal programs or internal programs integrated in customer application platform

User application

GSM engine

Channel 1

Channel 2

Channel 3

Terminal 1

Terminal 2

Terminal 3

Data/Fax/ GPRS supported

Data/Fax not supported

Serial

I/O

MUX conforming to GSM 07.10

Serial

I/O

MUX conforming to GSM 07.10

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2.2 Virtual channels and AT commands

Please note that a cellular engine designed for multiplex operation does not include three different devices. Only one single air interface (RF part) is available.

As mentioned before the multiplexer enables one serial interface to run three sessions simultaneously. All incoming or outgoing calls are connected to the device. Channel 1 supports the full range of functions, which is available without multiplexer tool. Channel 2 and 3 are connected to a different AT interpreter and support a subset of the functional range of channel 1, for more details refer to Table 1.

Table 1: Comparison of multiplexer channels

Voice calls incoming outgoing

Data / fax calls 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

except for AT commands related to data and fax calls

only two channels can be used parallel to transmit GPRS data

Examples

• While a data call is in progress on channel 1, you can send a short message on channel 2 and edit the phonebook on channel 3.

• When receiving a fax on channel 1, you are able to check the battery capacity using the appropriate AT command on channel 2 or 3.

Note

Due to the technical requirements of multiplexer mode, data and fax calls can only be set up on logical channel 1 while GPRS connections can be established on every channel. Several AT commands have a different behavior on channels 2 and 3. Additional information regarding restrictions and interferences between the channels can be found in chapter 3.1 and in [2].

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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 request by Siemens. The Siemens sources are packed in a *.zip file which includes a driver for Windows 2000 and Windows XP. See [5] for a detailed description.

3.1 Characteristics

After establishing the multiplexer mode according to the multiplexer protocol, three logical channels are available. Please keep the following restrictions and requirements in mind:

3.1.1 Basic requirements

• The GSM engine supports the basic option and UIH Framing according to GSM 07.10.

• Character

framing must be configured for 8 data bits, no parity and 1 stop bit.

If you wish to use multiplexer mode with TC35i modules, be sure not to change this setting.

• Hardware flow control AT\Q3 is recommended for use with multiplexer mode. If used, it needs to be set before multiplexer mode is entered.

• Several customer software applications may be able to change the selected settings. These settings will be stored in the non-volatile memory and used whenever the module is powered up again. In this case the multiplexer fails to start. To avoid this, it is recommended 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 are received.

3.1.2 Restrictions

If the GSM engine is operated in multiplexer mode, the following restrictions apply:

• MO and MT circuit-switched data and fax calls can only be set up on channel 1.

• It is not recommended to use AT+CFUN=<n> for selecting one of the SLEEP modes. 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 Chapter 4.3.10.

The multiplexer cannot be started if one of the following features is activated, nor can these features be used when multiplexer is active:

• Multiplex mode cannot be started while autobauding (AT+IPR=0) is enabled.

• The multiplexer is not available in charge-only mode and in alarm mode.

• XON/OFF flow control is not supported in multiplexer mode.

The maximum frame size N1 (defined in GSM 07.10) is fixed to 98 bytes and cannot be changed. The maximum frame size is the same for sending and receiving. See also Chapter 4 in this manual and GSM 07.10.

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