NETGEAR XM128 ISDN specification

Reference Guide for the Model XM128 ISDN Digital Modem

Although not defined in X.75, the XID frame is based on the encoding in ISO Standard 8885 and on being used in V.42/V.42bis. In addition to the compression parameters, XID can be used to negotiate such packet parameters as window or packet size.

Bundle Connection with V.42bis Data Compression

If both sites have set AT&K44 to enable V.42bis negotiation, XID frames can be exchanged through the main B channel, which corresponds to the call established by the first setup message.

Only one data compression channel can be used in bundle connection, which means that the compression is done before packet disassembly and the decompression is done after packet assembly. The compression ratio of V.42bis is commonly recognized as up to 4:1 for text files. If the line speed is 128 Kbps, the DTE speed may reach 460 Kbps. This circumstance makes the normal RS-232 serial port of the DTE unsuitable for bundle applications. A special I/O card on the computer side is required in this situation for external models.

ISDN Overview

6-19

Image 67

NETGEAR XM128 ISDN manual Bundle Connection with V.42bis Data Compression

Contents

USA NETGEAR, Inc Statement of Conditions TrademarksEN 55 022 Declaration of Conformance Customer Support Bestätigung des Herstellers/ImporteursCertificate of the Manufacturer/Importer VCCI-2 Statement World Wide Web Bulletin Board Service Contents Reference Guide for the Model XM128 Isdn Digital Modem Error Correction and Data Compression with Chapter Advanced Isdn Appendix a Technical Specifications Appendix E Connector Pin Assignments Figures Xii Tables Xiii Tables 10-1 Table F-1 Xvi Tables Purpose Preface Special Message Formats ConventionsUse of Enter, Type, and Press Related Publication Manual contentsOther Conventions DSU Manuals Chapter Introduction Features Reference Guide for the Model XM128 Isdn Digital Modem Interface Options Front PanelInterface options Label Color Activity Description LED descriptionsPWR CTS DTRDSR RTS Rear panel of the Model XM128 modem with S interface Rear Panel ON/OFF PowerRear panel components Label DescriptionPage Package Contents Chapter Installation Model XM128 modem connections Installing the Modem Verifying Hardware Installation Page Selecting the Appropriate Windows 95 Driver INF file Setup for Windows 95 and Windows NT Click on Close Configuring Your Isdn Line and Network Chapter ConfigurationConfiguring Your Modem Using a Terminal Program Unix Understanding AT CommandsTerminal programs Operating system Program Supported AT command types Quick Tips for Issuing AT CommandsType of AT command Example Command Description Communication Speed SetupUsing AT Commands to Verify Modem Response Result codes commands Switches supported by the Model XM128 modem Switch Type Setup for North America Type ATSPIDO=n and Enter Spid Setup for North America Entering DNs Setup for Europe and the United Kingdom Multiple subscriber number AT command AT commands for setting protocolsAT commands for setting MSN Protocol AT command Chapter Async to Sync PPP Internet and Remote Access PPP and SlipMaking Async to Sync PPP and Slip calls Keeping a Line Connection During Idle Time Model XM128 modem modem responds Answering Async to Sync PPP calls Making a call using Multilink PPPMultilink PPP Value Description Dialing Pre-stored Phone NumbersEndpoint Discriminator S85 register values Call Bumping Dynamic Channel Allocation Page Dialing Out Using Isdn Mode Commands for Outgoing CallsChapter Isdn Overview Manually Switching Communication Modes Dialing Out Using Isdn Mode Optional Speech Bearer ServiceDialing Out for Analog Adapter Port Placing the Call Dialing commandsCall placing commands AT Command Dial string it maps to Digital Data Commands for Incoming Calls Determining the Packet Length Commands for assigning Isdn numbers Answering a Call Using MSN Best-effort Call Answering Data over Speech Channel Multi Auto-Answering of Data Calls Ambiguity Resolution Switch for Voice CallsBest-effort call answering bit commands Command Function Understanding Isdn Communication Protocols Isdn protocol specificationsParameter 110 120 Answering a V.110 Call Configuration commandsAT Command Description Isdn Communications Selecting V.120 for German National Isdn 1TR6 Selecting V.120 for European Isdn DSS1 Switch Making a V.120 Call Answering a V.120 Call Dialing in V.120 Mode Identifying Your Line Provisioning Kbps Speeds Answering an X.75 Call Isdn Communications EuropeMaking an X.75 Call Making a Bundled Call with Dialing Prestored Phone Numbers Bundle Connection with V.42bis Data Compression Page Call Control for DSS1 Chapter Advanced Isdn Register values and functions Control of Outgoing Service IndicatorS108+n= Function Control of Isdn Phone Numbers and Subaddresses Outgoing low-layer compatibility commandsS108.n= Function Reference Guide for the Model XM128 Isdn Digital Modem Call Control for 1TR6 Old German Isdn Control of EAZ Endgeräteauswahlziffer Command Function Answering a Call for DSS1 Answering a Call Best-effort Call Answering Answering a Call for 1TR6 Multi-Auto-Answering of Data Calls Ambiguity Resolution Switch for Voice Calls Data Call Indication Disable Inbound Call Connection Placing a Call Point-to-Point ConfigurationPlacing a Call for DSS1 Placing a Call for 1TR6 User-To-User Information Page Chapter Analog Call Handling AT Command Description of command AT Commands for Analog CallsFrequently used AT commands Frequently used AT commands European switches Placing a Call from the Analog Adapter Making and Receiving Analog Calls Accepting an Incoming Call Modifier Definition Chapter Modem UpgradeUpgrading with Flash Eprom Definitions for the d modifier Kernel Mode Upgrade Instructions Test Description Chapter TroubleshootingPower-on Self-test Test Sequence Isdn Loopback test AT&T9 Loopback TestsLoopback with Self-test AT&T10 B1/B2 Loopback with Self-test Diagnostic Command Using The Embedded Protocol Analyzer Modem Reset Capturing the Protocol Data Setting up the Embedded EPA Atct EPA CommandsCommands for analyzing captured data Analyzing the Captured Data Key Function Description Control key functionsPage Security Appendix a Technical SpecificationsGeneral Specifications Network Protocols and Standards Compatibility Data Compression Power AdapterPhysical Specifications Environmental Specifications Security Types and Levels Appendix B Security Functions Type 1 Security Type 2 Security Level 1 SecurityLevel 2 Security Table B-1 Types of security Level Setting and Modifying PasswordsLevel 3 Security Table B-2 Levels of security AT*GC1 Nonpassword Auto Callback FunctionTable B-3 Auto callback commands AT*GC0 Operation Mode of the DTE Interface Appendix C AT Command Set ReferenceSimplex Mode Table C-1 Basic AT command set AT Command DescriptionsCommand Options Function and description CL? CE0CE1 CH? CP1 CP0Dtmf USA Model XM128 modem returns result code SPID? Description of ATI3 OutputSPID0 SPID1 Table C-3 Extended AT& command set Table C-2 ATI3 command outputOutput parameter Output value description Result Codes Knn =phone number Table C-4 Extended AT* command set Table C-4 lists the extended AT* command set Appendix D Status Registers and Result Codes Viewing and Setting S-Registers Examples for Setting S-Registers Setting S-Registers Operation Example Decimal Hexadecimal Binary Table D-2 Setting bitTable D-1 Binary conversion table Bit Binary Decimal Hexadecimal Value Register Descriptions Command Function and description DefaultTable D-3 Basic S-registers ATSn=x Table D-4 Extended S-registers ATSn=x See also S-register ATX2 ATX3 ATX4 ATX1 S24= Bitmapped register S35= Bitmapped register When Data/Voice is pressed Do not send low-layer compatibility Enables loopback 4 test DCA function is enabled Reference Guide for the Model XM128 Isdn Digital Modem Reference Guide for the Model XM128 Isdn Digital Modem Reference Guide for the Model XM128 Isdn Digital Modem Message handling systems MHS Reference Guide for the Model XM128 Isdn Digital Modem Speed is greater than 19200 bps ATXn Result Code Option Table Table D-5 ATXn command setting options Connect Table D-6. Result code chart Result Code Chart Symbol ReferenceSupported Table D-7 Result code field descriptions Result Code Field DescriptionsField name Possible values Table D-8 Connect strings Connect Strings for Error Corrected ConnectionsPage RJ-45 Plug and Connector Appendix E Connector Pin Assignments RCV + XMT + Pin Assignment Table E-3. RJ-11 connector pin assignments RJ-11 Plug and ConnectorPage Table F-1 Serial port interface Signal/pin description Signal direction Signal nameAppendix F Serial Port Interface RS-232 Serial Interface CD DCD DTR Asynchronous Cable ConnectionsTable F-2 Asynchronous flow control cable connection TXD RXD RTS CTS DSR Isdn Overview Appendix G Isdn Reference Basic Rate Interface Out-of-Band Signaling Isdn Basic Rate Interface Points Terminal Adapter or Digital Modem Spid Setup Ordering Isdn Service Reference Guide for the Model XM128 Isdn Digital Modem Table G-1 Isdn line configuration Order Form for AT&T 5ESS Switch NI-1 Isdn Table G-2 Isdn line configuration Order Form for DMS-100 Switch NI-1 or Custom Isdn Order Form for Ewsd NI-1 Isdn Table G-3 Isdn line configuration Numerics Index Isdn Reference Guide for the Model XM128 Isdn Digital Modem Reference Guide for the Model XM128 Isdn Digital Modem