Siemens AC45 Manuals

Table of Contents

• • 3

    Table of Contents
  • 5

    Document History

• 6

  1 Introduction

  • 7

    Supported Products and Related Documents
  • 7

    References
  • 8

    Term and Abbreviations

• 9

  2 Multiplexer Protocol - an Overview

  • 9

    Product Concept and Architecture
  • 9

    Figure 1: Multiplexer Architecture
  • 10

    Virtual Channels and at Commands
  • 10

    Table 1: Comparison of Multiplexer Channels

• 11

  3 Integrating Multiplexer Into the Customer Application

  • 11

    Characteristics
    • 11

      Basic Requirements
    • 11

      Restrictions
    • 12

      Dependencies Between Multiplexer Channels and Restrictions of Use
    • 12

      Functions Without Channel Dependencies
    • 13

      Timing Conditions
    • 13

      Operation of a Second Physical Serial Interface ASC1 (If Applicable)
  • 14

    Multiplexer Control and Signaling Lines
    • 14

      Flow Control
    • 15

      Figure 2: Logical Flow Control and RTS/CTS Signaling Behind the Decoder
    • 16

      Escape Sequence
  • 16

    Power Saving
  • 16

    Bandwidth of Logical Channels

• 17

  4 Structure of the Multiplexer Protocol

  • 17

    Introduction of the Multiplexer Protocol
  • 17

    Data Link Layer
    • 17

      Figure 3: Data Link Layer
    • 18

      Address Field
    • 18

      Flag Sequence
    • 18

      Table 2: Address Field
    • 18

      Table 3: Assignment of the DLCI
    • 18

      Table 4: Use of the Command/Response Bit
    • 19

      Control Field
    • 19

      Table 5: Coding of the Control Field
    • 20

      Frame Checking Sequence Field (FCS)
    • 20

      Information Field
    • 20

      Length Indicator
  • 21

    State Diagrams
    • 22

      Figure 4: Relationship Between the Customer ΜC and the GSM Engine ΜC
    • 23

      Figure 5: MPI - Startup, DLC Establishment and Information Transfer
    • 24

      Figure 6: MP - DLC Release and Close Down
    • 25

      DLC Establishment
    • 25

      Figure 7: DLC Establishment
    • 25

      Figure 8: Information Transfer
    • 25

      Information Transfer
    • 25

      Start-Up Procedure
    • 26

      Close-Down Procedure
    • 26

      DLC Release
    • 26

      Figure 10: Multiplexer Control Channel
    • 26

      Figure 9: DLC Release
    • 26

      Multiplexer Control Channel
    • 27

      Multiplexer Close Down (CLD)
    • 27

      Test Command (Test)
    • 28

      Figure 11: Modem Status Command (MSC)
    • 28

      Modem Status Command (MSC)
    • 30

      Figure 12: Power Saving Control (PSC)
    • 30

      Power Saving Control (PSC)
    • 31

      Non-Supported Command Response (NSC)
  • 32

    Example: Establishing Logical Channels Without Parameter Negotiation
  • 32

    Figure 13: Establishing the Multiplexer Control Channel and the Logical Channel

• 33

  5 Multiplexer Protocol Version Control

  • 33

    Introduction
  • 34

    Multiplexer Protocol Versions
  • 34

    Figure 14: MSC As Used in Version 3
  • 34

    Table 6: Version Differences for MSC
  • 35

    Implementing Version Control
    • 35

      Troubleshooting
    • 36

      Coding of "Testcommand" Message
    • 36

      Example of "Testcommand" Message
    • 36

      Table 7: IEI Coding
    • 36

      Table 8: Coding of "Testcommand" (Example)