Basic Rate Interface, Out-of-Band Signaling | NETGEAR XM128 ISDN

Reference Guide for the Model XM128 ISDN Digital Modem

Basic Rate Interface

When you order a Basic Rate Interface (BRI) ISDN line, you receive what is known as the 2B+D service. This service provides two B channels that can transmit at 64 Kbps per channel for user information and a D channel that can communicate between the user and the ISDN network at 16 Kbps.

The D channel is used to manage communication between the equipment and the switch. It is used mainly to exchange signal messages with the switch and to set up and release calls. In most cases, if there is any incompatibility issue raised, it is the D channel signaling protocol that is causing the problem. The Model XM128 modem does not allow the user to use the D channel for sending and receiving user data.

Out-of-Band Signaling

Some switches transmit all the network signals through the D channel, freeing both B channels to be used exclusively for your communication. This arrangement allows a throughput of 128 Kbps (64 Kbps per channel). However, not all switches support out-of-band signaling at this time. For the switches that do not support out-of-band signaling, network signals are transmitted through B channels only, which reduces the bandwidth to 56 Kbps.

The Model XM128 modem currently supports the following switch types and D channel protocols:

•DSS1

•1TR6

•AT&T 5ESS Custom and National ISDN-1 protocol

•Northern Telecom DMS-100 Custom and National ISDN-1 protocol

•Siemens EWSD National ISDN-1 protocol

•Rate Adaption & B channel protocol

The Model XM128 modem currently supports the following protocols:

•V.120

•X.75

•V.110

•Asyn-to-sync PPP and PPP/MP

G-2	ISDN Reference

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NETGEAR XM128 ISDN manual Basic Rate Interface, Out-of-Band Signaling

Contents

NETGEAR, Inc USA EN 55 022 Declaration of Conformance TrademarksStatement of Conditions VCCI-2 Statement Bestätigung des Herstellers/ImporteursCertificate of the Manufacturer/Importer Customer Support Bulletin Board Service World Wide Web 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 Tables Xiii 10-1 Table F-1 Xvi Tables Preface Purpose Use of Enter, Type, and Press ConventionsSpecial Message Formats Other Conventions Manual contentsRelated Publication Manuals DSU Features Chapter Introduction Reference Guide for the Model XM128 Isdn Digital Modem Interface options Front PanelInterface Options PWR LED descriptionsLabel Color Activity Description RTS DTRDSR CTS Rear Panel Rear panel of the Model XM128 modem with S interface Label Description PowerRear panel components ON/OFFPage Chapter Installation Package Contents Installing the Modem Model XM128 modem connections Verifying Hardware Installation Page Setup for Windows 95 and Windows NT Selecting the Appropriate Windows 95 Driver INF file Click on Close Configuring Your Modem Using a Terminal Program Chapter ConfigurationConfiguring Your Isdn Line and Network Operating system Program Understanding AT CommandsTerminal programs Unix Type of AT command Example Quick Tips for Issuing AT CommandsSupported AT command types Result codes commands Communication Speed SetupUsing AT Commands to Verify Modem Response Command Description Switch Type Setup for North America Switches supported by the Model XM128 modem Spid Setup for North America Type ATSPIDO=n and Enter Setup for Europe and the United Kingdom Entering DNs Protocol AT command AT commands for setting protocolsAT commands for setting MSN Multiple subscriber number AT command Making Async to Sync PPP and Slip calls Internet and Remote Access PPP and SlipChapter Async to Sync PPP Model XM128 modem modem responds Keeping a Line Connection During Idle Time Multilink PPP Making a call using Multilink PPPAnswering Async to Sync PPP calls S85 register values Dialing Pre-stored Phone NumbersEndpoint Discriminator Value Description Call Bumping Dynamic Channel Allocation Page Chapter Isdn Overview Commands for Outgoing CallsDialing Out Using Isdn Mode Dialing Out for Analog Adapter Port Dialing Out Using Isdn Mode Optional Speech Bearer ServiceManually Switching Communication Modes AT Command Dial string it maps to Dialing commandsCall placing commands Placing the Call Commands for Incoming Calls Digital Data Determining the Packet Length Answering a Call Using MSN Commands for assigning Isdn numbers Data over Speech Channel Best-effort Call Answering Command Function Ambiguity Resolution Switch for Voice CallsBest-effort call answering bit commands Multi Auto-Answering of Data Calls Parameter 110 120 Isdn protocol specificationsUnderstanding Isdn Communication Protocols Isdn Communications Configuration commandsAT Command Description Answering a V.110 Call Selecting V.120 for European Isdn DSS1 Switch Selecting V.120 for German National Isdn 1TR6 Answering a V.120 Call Making a V.120 Call Dialing in V.120 Mode Identifying Your Line Provisioning Kbps Speeds Making an X.75 Call Isdn Communications EuropeAnswering an X.75 Call Making a Bundled Call with Dialing Prestored Phone Numbers Bundle Connection with V.42bis Data Compression Page Chapter Advanced Isdn Call Control for DSS1 S108+n= Function Control of Outgoing Service IndicatorRegister values and functions S108.n= Function Outgoing low-layer compatibility commandsControl of Isdn Phone Numbers and Subaddresses Reference Guide for the Model XM128 Isdn Digital Modem Call Control for 1TR6 Old German Isdn Command Function Control of EAZ Endgeräteauswahlziffer Answering a Call Answering a Call for DSS1 Answering a Call for 1TR6 Best-effort Call Answering Ambiguity Resolution Switch for Voice Calls Multi-Auto-Answering of Data Calls Disable Inbound Call Connection Data Call Indication Placing a Call for DSS1 Point-to-Point ConfigurationPlacing a Call Placing a Call for 1TR6 User-To-User Information Page Chapter Analog Call Handling Frequently used AT commands European switches AT Commands for Analog CallsFrequently used AT commands AT Command Description of command Making and Receiving Analog Calls Placing a Call from the Analog Adapter Accepting an Incoming Call Definitions for the d modifier Chapter Modem UpgradeUpgrading with Flash Eprom Modifier Definition Upgrade Instructions Kernel Mode Test Sequence Chapter TroubleshootingPower-on Self-test Test Description Loopback with Self-test AT&T10 Loopback TestsIsdn Loopback test AT&T9 Diagnostic Command B1/B2 Loopback with Self-test Modem Reset Using The Embedded Protocol Analyzer Setting up the Embedded EPA Capturing the Protocol Data Analyzing the Captured Data EPA CommandsCommands for analyzing captured data Atct Control key functions Key Function DescriptionPage Network Protocols and Standards Compatibility Appendix a Technical SpecificationsGeneral Specifications Security Environmental Specifications Power AdapterPhysical Specifications Data Compression Appendix B Security Functions Security Types and Levels Table B-1 Types of security Level 1 SecurityLevel 2 Security Type 1 Security Type 2 Security Table B-2 Levels of security Setting and Modifying PasswordsLevel 3 Security Level AT*GC0 Nonpassword Auto Callback FunctionTable B-3 Auto callback commands AT*GC1 Simplex Mode Appendix C AT Command Set ReferenceOperation Mode of the DTE Interface Command Options Function and description AT Command DescriptionsTable C-1 Basic AT command set CH? CE0CE1 CL? Dtmf CP0CP1 USA Model XM128 modem returns result code SPID1 Description of ATI3 OutputSPID0 SPID? Output parameter Output value description Table C-2 ATI3 command outputTable C-3 Extended AT& command set Result Codes Knn =phone number Table C-4 lists the extended AT* command set Table C-4 Extended AT* command set Viewing and Setting S-Registers Appendix D Status Registers and Result Codes Setting S-Registers Examples for Setting S-Registers Bit Binary Decimal Hexadecimal Value Table D-2 Setting bitTable D-1 Binary conversion table Operation Example Decimal Hexadecimal Binary Table D-3 Basic S-registers ATSn=x Command Function and description DefaultRegister Descriptions Table D-4 Extended S-registers ATSn=x See also S-register ATX1 ATX2 ATX3 ATX4 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 Table D-5 ATXn command setting options ATXn Result Code Option Table Connect Supported Result Code Chart Symbol ReferenceTable D-6. Result code chart Field name Possible values Result Code Field DescriptionsTable D-7 Result code field descriptions Connect Strings for Error Corrected Connections Table D-8 Connect stringsPage Appendix E Connector Pin Assignments RJ-45 Plug and Connector Pin Assignment RCV + XMT + RJ-11 Plug and Connector Table E-3. RJ-11 connector pin assignmentsPage RS-232 Serial Interface Signal/pin description Signal direction Signal nameAppendix F Serial Port Interface Table F-1 Serial port interface TXD RXD RTS CTS DSR Asynchronous Cable ConnectionsTable F-2 Asynchronous flow control cable connection CD DCD DTR Appendix G Isdn Reference Isdn Overview Out-of-Band Signaling Basic Rate Interface Terminal Adapter or Digital Modem Isdn Basic Rate Interface Points Ordering Isdn Service Spid Setup Reference Guide for the Model XM128 Isdn Digital Modem Order Form for AT&T 5ESS Switch NI-1 Isdn Table G-1 Isdn line configuration Order Form for DMS-100 Switch NI-1 or Custom Isdn Table G-2 Isdn line configuration Table G-3 Isdn line configuration Order Form for Ewsd NI-1 Isdn Index Numerics Isdn Reference Guide for the Model XM128 Isdn Digital Modem Reference Guide for the Model XM128 Isdn Digital Modem