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NETGEAR XM128 ISDN 128 Kbps Speeds, Error Correction and Data Compression with V.120

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Reference Guide for the Model XM128 ISDN Digital Modem

ISDN Overview 6-15

128 Kbps Speeds

BRI ISDN consists of three (2B+D) logical channels. Each B channel can be used independently

for a dial-up connection running at 56 Kbps or 64 Kbps (bits per second).

The two B channels can be used together for a single data connection to provide 112K (with

In-Band Signaling) or 128K (when Out-of-Band Signaling is used). It is called a Bundle

Connection (different from BONDING).

The type of channel bundling described in the V.120 section is supported only between the

following NETGEAR products: Model XM128 modem. Dialing Prestored Phone Numbers

Use ATDSn, n=0,1,...,39, to dial th e (n+1) th phone number twice for both the bundle connections.

Use ATDSn+Sm, (n and n=0,1,...,39) to dial the (n+1)th phone number for the fir st connect ion and

the (m+1)th phone number for the second connection.

For example, ATDIS0+S1[Enter] dials the number stor ed in location 0, and the number stored in

location 1 for the bundle connection.

Error Correction and Data Compression with V.120

With V.120, the default setting is for Link Access Protocol Digital (LAPD) error correction only.

No data compression is negotiated. The following AT commands are used to switch the V.42bis

data compression on or off for ISDN data calls when using V.120 protocol:

• AT&K44 (enable V.42bis on ISDN call)

• AT&K00 (disable V.42bis on ISDN call)

With the &K44 setting, the Model XM128 modem tries to connect using V.42bis data

compression. If the remote device does not support V.42, then LAPD error correction can be used.

When a connection is made using V.42bis compression, the following connect message is

displayed:

CONNECT 115200/V120 56 000/LAPD/V42b.

It takes extra time for the calling ISDN devi ce to negot iate V.42bis. If you know in a dv ance t hat the

called site has no V.42bis capability, it would be better to issue the AT&K00 command beforehand

in order to get a quick connection.

V.42bis is an international data compression standar d commonly used in modem communications.

This standard provides real-time data compression. The NETGEAR expertise in data compression

has been brought into its ISDN applications, which are much higher in speed than modem

communications.

Contents

Main ii Trademarks Statement of Conditions Federal Communications Commission (FCC) Compliance Notice: Radio Frequency Notice EN 55 022 Declaration of Conformance iii Besttigung des Herstellers/Importeurs Certificate of the Manufacturer/Importer VCCI-2 Statement Customer Support Page Contents Page Page Reference Guide for the Model XM128 ISDN Digital Modem Page Page Page Page Tables Page Page Page Preface Purpose Conventions Special Message Formats Use of Enter, Type, and Press Other Conventions Related Publication Table2 lists the manuals that are available for various localized products. xx Preface Getting Started Using FirstGear Table2. Manuals Table1. Manual contents (continued) Chapter 1 Introduction Features Page Interface Options Front Panel 1-4 Introduction Figure 1-2. Front panel of the Model XM128 modem (with U interface) Table1-2 . LED descriptions Introduction 1-5 Table1-2 . LED descriptions (continued) 1-6 Introduction Rear Panel 4 5 Figure 1-4. Rear panel of the Model XM128 modem (with U interface) Figure 1-3. Rear panel of the Model XM128 modem (with S inter face) Table1-3 describes the components on the rear panel of the Model XM128 modem. Table1-3. Rear panel components Page Chapter 2 Installation Package Contents Installing the Modem Verifying Hardware Installation Page Chapter 3 Setup for Windows 95 and Windows NT 4.0 Selecting the Appropriate Windows 95 Driver (INF fi le) Page Chapter 4 Configuration Configuring Your ISDN Line and Network Configuring Your Modem Using a Terminal Program Understanding AT Commands Page Communication Speed Setup Page Page Entering DNs Page Chapter 5 Async to Sync PPP Internet and Remote Access PPP and SLIP Making Async to Sync PPP and SLIP c alls Page Answering Async to Sync PPP calls Multilink PPP Dialing Pre-stored Phone Numbers Call Bumping Dynamic Channel Allocation Page Chapter 6 ISDN Overview Commands for Outgoing Calls Dialing Out Using ISDN Mode Dialing Out Using ISDN Mode Optional Spe ech Bearer Service Dialing Out for Analog Adapter Port 1 Dialing Out for Analog Adapter Port 2 Manually Switching Communication Modes Placing the Call Commands for Inco ming Calls Digital Data Determining the Packet Length Answering a Call Using MSN Page Page Understanding ISDN Communication Protocols V.110 ISDN Communications V.120 ISDN Communications Configuring the V.120 Mode Dialing in V.120 Mode Making a Bundled Call with V.120 Identifying Your Line Provisioning 128 Kbps Speeds Error Correction and Data Compression with V.120 X.75 ISDN Communications (Europe) Making a Bundled Call with X.75 Dialing Prestored Phone Numbers Invoking V.42bis Data Compression Bundle Connection with V.42bis Data Compression Page Chapter 7 Advanced ISDN Call Control for DSS1 Control of Outgoing Service Indicator Control of ISDN Phone Numbers and Subaddresses Page Call Control for 1TR6 (Old German ISDN) Control of Outgoing Service Indicator Control of EAZ (ENDGERTEAUSWAHLZIFFER) 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 Page Placing a Call Placing a Call for DSS1 Placing a Call for 1TR6 User-To-User Information Page Chapter 8 Analog Call Handling AT Commands for Analog Calls Making and Receiving Analog Calls Placing a Call from the Analog Adapter Accepting an Incoming Call Chapter 9 Modem Upgrade Upgrading with Flash EPROM Upgrade Instructions Kernel Mode Chapter 10 Troubleshooting Power-on Self-test Loopback Tests ISDN Loopback test (AT&T9) Loopback with Self-test (AT&T10) B1/B2 Loopback with Self-test The Diagnostic Command Modem Reset Using The Embedded Protocol Analyzer Page Page Page Page Appendix A Technical Specifications General Specifications Page Appendix B Security Functions Security Types and Levels Level 1 Security Level 2 Security Level 3 Security Setting and Modifying Passwords Nonpassword Auto Callback Fun ction Appendix C AT Command Set Reference Operation Mode of the DTE Interface Simplex Mode AT Command Descriptions AT Command Set Reference C-3 C-4 AT Command Set Reference AT Command Set Reference C-5 C-6 AT Command Set Reference AT Command Set Reference C-7 Description of ATI3 Output The Link Status Report output is displayed on the screen as follows: C-8 AT Command Set Reference TableC-2 shows the outputs for the AT13 commands. TableC-3 lists the extended AT& command set. TableC-2. ATI3 command out put TableC-3. Extended AT& command set AT Command Set Reference C-9 TableC-3. Extended AT& command set (continued ) C-10 AT Command Set Reference TableC-3. Extended AT& command set (conti nued) AT Command Set Reference C-11 TableC-3. Extended AT& command set (continued ) C-12 AT Command Set Reference TableC-4 lists the extended AT* command set. TableC-4. Extended AT* command set Appendix D Status Registers and Result Codes Viewing and Setting S-Register s Setting S-Registers AND operation to set bit 3 to 0 (binary). D-4 Status Registers and Result Codes S-Register Descriptions TableD-3. Basic S-registers ATSn=x Status Registers and Result Codes D-5 TableD-4. Extended S-registers ATSn=x D-6 Status Registers and Result Codes Status Registers and Result Codes D-7 D-8 Status Registers and Result Codes Status Registers and Result Codes D-9 D-10 Status Registers and Result Codes Status Registers and Result Codes D-11 D-12 Status Registers and Result Codes Status Registers and Result Codes D-13 Reference Guide for the Model XM128 ISDN Digital Modem D-14 Status Registers and Result Codes Status Registers and Result Codes D-15 D-16 Status Registers and Result Codes Status Registers and Result Codes D-17 D-18 Status Registers and Result Codes Status Registers and Result Codes D-19 ATXn Result Code Option Table TableD-5. ATXn command setting options D-20 Status Registers and Result Codes TableD-5. ATXn comman d setting options (continued) Status Registers and Result Codes D-21 Result Code Chart Symbol Reference TableD-6 lists the result codes. TableD-6. Result code chart D-22 Status Registers and Result Codes Result Code Field Desc riptions TableD-7 lists the result code field descriptions. TableD-7. Result code field descriptions Connect Strings for Error Corrected Connections Page Appendix E Connector Pin Assignments RJ-45 Plug and Connector E-2 Connector Pin Assignments TableE-1 lists the pin assignments for the RJ-45 plug and RJ-45 connector for the S/T interface. TableE-2 lists the pin assignments for the RJ-45 plug and RJ-45 connector for the U interface. TableE-1. RJ-45 plug and RJ-45 connector pin assignments for the S/T interface TableE-2. RJ-45 plug and RJ-45 connector pin assignments for the U interface RJ-11 Plug and Connector Page Serial Port Interface F-1 Appendix F Serial Port Interface RS-232 Serial Interface TableF-1 describes the RS-232 25-pin serial port interface for the Model XM128 modem. Table F-1. Serial port int erface F-2 Serial Port Interface Asynchronous Cable Connections TableF-2 provides information about the asynchronous flow control cable connection. TableF-2. Asynchronous flow control cable connection TableF-1. Serial port interface (continued) Appendix G ISDN Reference ISDN Overview Basic Rate Interface Out-of-Band Signaling Terminal Adapter or Digital Modem ISDN Basic Rate Interface Points SPID Setup Ordering ISDN Service Page Order Form for AT&T 5ESS Switch (NI-1 ISDN) Order Form for DMS-100 Switch (NI-1 or Custom ISDN) Order Form for EWSD (NI-1 ISDN ) Index Numerics A B C D E F H I O P R S T V W X