ZyXEL Communications omni series guide

to dial the (n+1)th phone number for the first connection and the (m+1)th phone number for the second connection.

For example, ATDIS0+S1<Enter> will dial the number stored 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 LAPD error correction only. No data compression will be 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 - enables V.42bis on ISDN calls.

∙AT&K00 - disables V.42bis on ISDN calls.

With the &K44 setting, the TA will try to connect using V.42bis data compression. If the remote device doesn’t support V.42, then LAPD error correction will be used.

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

CONNECT 115200/V120 56000/LAPD/V42b.

It takes extra time for the calling ISDN TA to negotiate V.42bis. If you know in advance that 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.

Since the V.42bis algorithm needs an error-free transmission channel between the compression and decompression processes, it can only work with a protocol with error control competence. X.75 and V.120 are such protocols that can be used together with V.42bis data compression. V.110, on the other hand, is just an R-interface layer 1 adaptation protocol without error-control and is thus inadequate for V.42bis.

62 V.120 ISDN Communications

Image 74

ZyXEL Communications omni series user manual Error Correction and Data Compression with

Contents

ZyXEL ZyXEL Limited Warranty Acknowledgments FCC Part 15 InformationCopyright 1997 by ZyXEL Page Contacting ZyXEL ∙ E-mailPage Contents Outgoing Calls Understanding AT CommandsInstalling the Windows 95 Driver INF file Incoming Calls Error Correction and Data Compression with Configuring Windows 95 Dial-Up Networking Capi InstallationIntroduction Feature list Placing outgoing calls Call Control for DSS1 Answering an X.75 call Making an X.75 CallInvoking V.42bis Data Compression Call Control for 1TR6 Old German Isdn Placing a Call Diagnostics 100Resetting The omni 103 Using The Embedded Protocol Analyzer Upgrading with Flash Eprom Register Descriptions 127 AT Command Descriptions 109Viewing and Setting S-Registers 125 Introduction Speed and Compatibility Key Features of the omniKey to Model Differentiation Intelligent Features Technical Specifications Interface Option Physical CharacteristicsUnpacking Your omni How to Become a Registered Owner Introduction Front Panel Installing omni External ModelsLED Indicators Page Front Panel Switch Back Panel Connecting to the Power Supply Connecting to Your Computer Connecting the omni.net to Your Computer Connecting to Your Isdn Line Interface Model Power On and Self Diagnostics Interface Installing omni External Models Installing omni Internal Models Selecting the Baud Rate Multiplier Connecting the TA to your PC Plug and Play Press Y to continue Following message will appear Connecting to Your Isdn Line Interface Model Omni.net Internal Card Installation S/T interface Configuring your TA using a Terminal program Configuring Your Isdn Line and NetworkConfiguring Your TA Type A\setup.exe and press Enter TA should respond Type Page Configuring Your Isdn Line and Network Understanding AT Commands Isdn Communication Basics Type of AT Command Example Supported AT command typesQuick Tips when issuing AT commands Outgoing Calls Dialing out using Isdn modeCommand Description ATV0 Dialing out for Analog Adapter Port 2 omni.net Dialing out for Analog Adapter Port 1 omni.net InternalDialing out for Analog Adapter Port 1 omni.net Incoming Calls Manually switching communication modes non-dataAT Command Dial string it will map to Placing the Call Digital Data Determining the Packet Length Answering a Call using MSN AT&ZIn=s where ‘s’ is the MSN Data over Speech Channel Ambiguity resolution switch for voice calls omni.netCommand Function Best-effort call answering non-data Multi auto-answering of data calls Setup for Windows 95 and NT Installing the Windows 95 Driver INF filePage Page Configuring Windows 95 Dial-Up Networking Page Page Click on TCP/IP Settings IPX/SPX Compatible Capi Installation Page Point-to-Point Protocol PPP Introduction Feature list Async to Sync Conversion external Compression Control Protocol CCP Multilink PPP Bandwidth On Demand BOD BACP/BAP Point-to-Point Protocol PPP 110 and Synchronous Mode Communications Answering a V.110 call Synchronous Connections external AT Command DescriptionMaking V.110 Calls CIC 25bis Command SetCommand Messages DIC Indicator Messages DTR Drop-Dialing Operation AT*D0 56 V.110 and Synchronous Mode Communications 120 Isdn Communications Placing outgoing calls Configuring the V.120 mode Dialing in V.120 mode Answering incoming calls Making a Bundled Call with Speeds of 128KbpsIdentifying your line provisioning Dialing pre-stored phone numbers Error Correction and Data Compression with Bundle Connection with V.42bis Data Compression Selecting V.120 for European Isdn DSS1Selecting V.120 for Germany National Isdn 1TR6 Page 10 X.75 Isdn Communications Answering an X.75 call Making an X.75 Call ATDIphonenumber1+phonenumber2 Invoking V.42bis Data Compression Bundle Connection with V.42bis Data Compression 70 X.75 Isdn Communications AT&V7 Handling Analog Calls non-dataAT&V6 European switch specific Placing a Call from the Analog Adapter Accepting an Incoming Call Scenarios of an Incoming Voice Call Outcome AT Commands Description Flash key Feature Phone omni.netCommands Description InterCom Receiving a second call Call WaitingPlacing a second call Call Transfer Call BrokerCall Reject Three-way Conference Call HFlash è H#3 Call Control for DSS1 Control of Outgoing Service IndicatorAdvanced Isdn Call Control S108.n= Function S108+n= FunctionS80 bit ‘n’ as follows Control of Isdn Phone Number and Sub-address = YnNnown-number/Znown-Subaddress Call Control for 1TR6 Old German Isdn G3 Fax Control of Endgerä Teauswahlziffer EAZModem Command Function Answering a Call Answering a Call for DSS1 Answering a Call for 1TR6 Best-effort Call Answering Data Call Indication Ambiguity Resolution Switch for Voice Calls non-dataMulti-Auto-Answering of Data Calls Disable inbound call connection Placing a call for DSS1 Point-to-Point ConfigurationPlacing a Call ATDxYnNncalledpartynumber/Zncalled-party- subaddress Placing a call for 1TR6 Leased Line Isdn ATDB3 ATDB1ATDB2 ATAB1 Security Functions Security Types and Levels Level 3 security Level 1 securityLevel 2 security Level Setting and Modifying Passwords Non-password Auto Call Back Function Security Functions Upgrading Your omni Upgrading with Flash Eprom Kernel Mode Test DiagnosticsDiagnostics Test Description Loopback with Self-test AT&T10 Power-on Self-testIsdn Loopback test AT&T9 Diagnostic Command Atcg B1/B2 Loopback with Self-test AT&T11 Resetting The omni Using The Embedded Protocol Analyzer Capturing the Protocol Data CB0 CD0CD1 CB1 ATC$ Key Function Description Diagnostics Multiplex mode AT Command Set ReferenceSimplex mode Operation Modes of the DTE Interface AT Command Descriptions Basic AT Command Set Command Options Function & Description All the Following Commands Require a AT Prefix CE0 BP0BP1 CL? CE1CH? CP0 Command Options Function & Description DB3 DB1DB2 DN? ATI USA SPID1 IsdnSPID0 SPID? Output Parameter Output Value Description Description of ATI3 OutputUPX Extended AT& Command Set Isdn Command Options Function & Description Command Options Function & Description Extended AT* Command Set Command Options Function & Description AT Command Set Reference Viewing S-registers Viewing and Setting S-RegistersStatus Registers and Result Codes Setting S-registers Operation Example-1 Example-2 Binary Dec Hex Register DescriptionsBit Binary value Decimal value Hexadecimal value Not Basic S-Registers ATSn=x Command Function & DescriptionCommand Bit Dec Hex Function and description Extended S-Registers ATSn=x Command Bit Dec Hex Function and description ATX2 ATX3 ATX4 ATX0ATX1 Command Bit Dec Hex Function and description Command Bit Dec Hex Function and description Command Bit Dec Hex Function and description Complete Command Bit Dec Hex Function and description Enable loopback 4 test DCA function enabled Command Bit Dec Hex Function and description SI= Fernsprechen analog 48000 bps PPP/MLPPP Command Bit Dec Hex Function and description PPP ATXn Result Code Option Table ATV0 ATV1 Connect Field Name Possible Values Result Code Chart Symbol ReferenceResult Code Field Descriptions Connect Strings for Error Corrected Connections Status Registers and Result Codes Phone Jack Pinout Assignments Not Connected Phone Jack Pinout Assignments Pin Signal/Pin Number Description Direction NameSerial Port Interface DCE TXD RXD RTS CTS DSR DTEMAC CD DCD DTR Index Index Bundled Index