Data Transfer Problems | ZyXEL Communications U-336R/RE specification

Data Transfer Problems

Problem

You can make a data connection with a remote modem, but encounter frequent errors during data transfers.

Solutions

1.Your modem and communications software may be configured for different flow control methods. Be sure your modem and software are both using hardware (RTS/CTS) flow control or software (XON/XOFF) flow control.

2.To verify that your modem and communications software are using the same flow control method, type AT&T8 and press the Enter key with your modem in the command state. You should see a smooth “stair-stepping” ASCII test pattern flowing diagonally across your screen.

Connect Problems

Problem

Your modem disconnects while communicating with a remote system.

Solutions

1.The remote system may have hung up. Type ATI2 and press Enter to view the link status report, which will include the reason for the disconnect. For information on understanding this report, refer to your ZyXEL Modem Reference Manual.

2.You may have subscribed to Call Waiting and received an incoming call that interrupted your data connection. See your telephone directory for information on disabling Call Waiting.

130 Diagnostics & Troubleshooting

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ZyXEL Communications U-336R/RE manual Data Transfer Problems, Connect Problems

Contents

ZyXEL ZyXEL Limited Warranty Acknowledgments FCC Part 15 InformationCopyright 1997 by ZyXEL Iii Information for Canadian Users Page Contacting ZyXEL ∙ E-mail Vii Contents Synchronous Mode Operation Leased Line Operation Special Functions Fax Operation Status Registers & Result Codes AT Command Set SummariesDiagnostics & Troubleshooting Upgrading Your Modem Index Terminal PinoutsXii Standard Features Modem FeaturesIntroduction Intelligent Features Technical Specifications Fax Compatibility Enclosed Equipment Unpacking Your ModemRequired Equipment Becoming a Registered Owner Introduction 336R/RE Modem Card InstallationInstallation Name Blinking DTR TXDRXD DSR Required Steps for U-336R/RE Installation Installing the modem card Connect to phone lines Fax/Modem Communication Software Installation Hooking Up PowerConnect to Computers Setting Value AT&F For troubleshooting suggestions Installation Basic Modem Operation Understanding AT CommandsUsing the Windows 95 Hyper Terminal Program Basic Modem Operation ATEnter Dialing using the ATD Command Dialing and Answering Techniques ATS0=n Making Your First ConnectionAuto-Answer and Hook Controls ATS0=0 Quick Tips when issuing AT Commands Command Description AT Command Set/Type Example Modem Result Codes Viewing S Register Values Changing S Register Values Dialing Stored Phone Numbers Non-Volatile MemoryStoring Phone Numbers AT&Zs=n Saving Settings and User Profiles Helpful Hints for PC Computers AT Command Description Default Modem Settings for PC’sZyXEL Serial/Parallel I/O Card Macintosh Serial Port Special AT Command Settings for MacintoshHelpful Hints for Macintosh Computers Mac Software Tips Helpful Hints for UNIX-Based Computers Basic Modem Settings for UnixSerial Cable Unix Software Tips 25bis Command Set Synchronous Mode OperationSynchronous Mode Operation Syntax Command with Description Parameters Clock Options RTS Options Sync AT&M1 Command State OptionsDialing from Synchronous Mode Data Auto-Answer Answering from Synchronous ModeManual Answer Synchronous Mode Operation AT-Command Description Connecting to a Leased LineLine Type Setting Leased Line Operation Manual Connect Power Level SettingLeased Line Handshaking Auto Handshake AT*M0 Leased-Line Dial BackupDial Backup AT*M1 Terminating a Leased Line Connection Aborting from Leased-Line Operation Levels of Security Special FunctionsSecurity Functions Special Functions User Passwords Command Function Enters the callback number AT*Rab Remote ConfigurationAT*Wab Caller Number Delivery Caller ID Ring Here is an example Distinctive Ring Extended Distinctive Ring EDR Type Bit Ring Sequence Special Functions Setting Up EDR S51 Bit-mapped register default Bits Bin Dec Description EDR Application Example CID/EDR RD Special Functions Special Functions Modem as Fax Machine Fax OperationFax Operation Defining the Fax Command Sets Fax Command setsITU-T T.30 Fax Protocol Class 1 Command Set Command Value Description Class 2 Command Set +FTH and +FRH support value 3 V.21 ch / 300 bps only Value Command Syntax Description+FCIG=string +FDCC=vr,br,wd Ln,df,ec,bf,st Df,ec,bf,st +FDCS=vr,br,wd+FDIS=vr,br,wd,l +FDR +FMDL? +FK+FLID=string +FMFR? Response Value Function and Description +FREV?+FCFR +FPOLL +FVOICE +FCC=vr,br,w Class 2.0 Command Set+FBS? +FCO +FDT +FLI=string +FIS=vr,br,wdTpr,idr,nsr DCE +FNS=string+FPI=string +FRQ=pgl,cbl HEX +FCICSI ID NSC FIF A0-BF+FNC +FNF +FPI +FNSNSS FIF CIG ID Extended Fax AT Command Set Modem will wait for DC2 at the beginning of every Tone No Carrier #PstringNo Dial Busy Snnnn Field DescriptionPstring Flow Control Fax Reception from a BBS String Error LevelConnect Init AT&FX7S0=1#B1+FCLASS=6 ExtrnMail ZyXEL errorlevel Command Options Function & Description AT Command Set SummariesBasic AT Command Set AT Command Set Summaries Command Options Function & Description UPX Description of ATI2 Output Link Status Report output appears as follows Data Type Description Output Parameter Output Value Description DTE Extended AT& Command Set DTE/DCE Command Options Function & Description Command Options Function & Description Command Options Function & Description Command Options Function & Description Command Options Function & Description Extended AT* Command Set Command Options Function & Description Command Options Function & Description Register Descriptions Command Function & Description +RefStatus Registers & Result Codes Basic S-Registers ATSn=x Command Bit Dec Hex Function and description Extended S-Registers ATSn=x Command Bit Dec Hex Function and description Command Bit Dec Hex Function and description Command Bit Dec Hex Function and description Command Bit Dec Hex Function and description ATX1 ATX2 ATX3 ATX4 Command Bit Dec Hex Function and description Command Bit Dec Hex Function and description Command Bit Dec Hex Function and description Command Bit Dec Hex Function and description ATA Command Bit Dec Hex Function and description Command Bit Dec Hex Function and description Command Bit Dec Hex Function and description Command Bit Dec Hex Function and description Command Bit Dec Hex Function and description Command Bit Dec Hex Function and description Register bit number, b, used in ATSr.b=n ATSr.b=? ATXn Result Code Option Table Result Code Options+nnn Supported Field Name Possible Values Connect Strings for Error Corrected ConnectionsResult Code Field Descriptions Numerical Verbose 24000 Status Registers & Result Codes Diagnostics Diagnostics & TroubleshootingDiagnostics & Troubleshooting Power-On Self Test Loopback Tests FR Calibration Indicator Lights Line Condition Status Display Received Signal Power Level RX Link Status Report ATI2 Characters sent from the DTE to the modem for transmission Data bytes sent to the remote modem ∙ Local Hang-up ∙ Remote Hang-up ∙ Carrier Lost ∙ On Line Trouble Shooting AT Command Set Problems Your modem fails to execute AT commands Command Echo Problems Answer Problems Dialing Problems Data Transfer Problems Connect Problems Type ATUPXenter Upgrading Your ModemUpgrading by Flash Eprom Upgrading Your Modem Kernel Recovery Mode TIP Terminal PinoutsTerminal Blocks Terminal Pinouts Signa Pin/Signal Direction DescriptionPC Serial Port Pinouts Name Macintosh Serial Port Pinouts Mac Modem Description Din Terminal Pinouts Index Index Smartdrv