Kernel Recovery Mode | ZyXEL Communications U-336R/RE guide

10.When the installation is complete, the modem restarts automatically.

Kernel Recovery Mode

Your modem is equipped with ZyXEL’s exclusive Kernel Recovery Mode. This unique feature enables quick recovery from failed flash uploads. With other modems, a failed flash upload usually results in the user having to return the modem to the factory for repair.

In the unlikely event that your modem fails to respond to AT commands after upgrading the flash EPROM:

1.Turn off the modem.

2.Press and hold down the A/O button while turning on the modem, then release the button after 5 seconds.

3.A Kernel Program responsible for the update process takes control of the modem. It accepts a limited set of AT commands, including the ATUPX command.

Repeat steps 1 through 6 from the directions above to upload a file that contains valid firmware for your modem.

132 Upgrading Your Modem

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ZyXEL Communications U-336R/RE manual Kernel Recovery Mode

Contents

ZyXEL ZyXEL Limited Warranty FCC Part 15 Information Copyright 1997 by ZyXELAcknowledgments Iii Information for Canadian Users Page Contacting ZyXEL ∙ E-mail Vii Contents Synchronous Mode Operation Leased Line Operation Special Functions Fax Operation AT Command Set Summaries Diagnostics & TroubleshootingStatus Registers & Result Codes Upgrading Your Modem Terminal Pinouts IndexXii Modem Features Standard FeaturesIntroduction Intelligent Features Technical Specifications Fax Compatibility Unpacking Your Modem Enclosed EquipmentRequired Equipment Becoming a Registered Owner Introduction Installation Installation336R/RE Modem Card Name Blinking TXD RXDDTR DSR Required Steps for U-336R/RE Installation Installing the modem card Connect to phone lines Hooking Up Power Fax/Modem Communication Software InstallationConnect to Computers Setting Value AT&F For troubleshooting suggestions Installation Understanding AT Commands Using the Windows 95 Hyper Terminal ProgramBasic Modem Operation Basic Modem Operation ATEnter Dialing using the ATD Command Dialing and Answering Techniques Making Your First Connection Auto-Answer and Hook ControlsATS0=n 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 Non-Volatile Memory Storing Phone NumbersDialing Stored Phone Numbers AT&Zs=n Saving Settings and User Profiles Helpful Hints for PC Computers Default Modem Settings for PC’s AT Command DescriptionZyXEL Serial/Parallel I/O Card Special AT Command Settings for Macintosh Helpful Hints for Macintosh ComputersMacintosh Serial Port Mac Software Tips Basic Modem Settings for Unix Helpful Hints for UNIX-Based ComputersSerial Cable Unix Software Tips Synchronous Mode Operation 25bis Command SetSynchronous Mode Operation Syntax Command with Description Parameters Clock Options RTS Options Command State Options Dialing from Synchronous ModeSync AT&M1 Data Answering from Synchronous Mode Auto-AnswerManual Answer Synchronous Mode Operation Connecting to a Leased Line Line Type SettingAT-Command Description Leased Line Operation Power Level Setting Leased Line HandshakingManual Connect Auto Handshake Leased-Line Dial Backup Dial BackupAT*M0 AT*M1 Terminating a Leased Line Connection Aborting from Leased-Line Operation Special Functions Security FunctionsLevels of Security Special Functions User Passwords Command Function Enters the callback number Remote Configuration AT*RabAT*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 Fax Operation Modem as Fax MachineFax Operation Fax Command sets Defining the 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 Command Syntax Description Value+FCIG=string +FDCC=vr,br,wd Ln,df,ec,bf,st +FDCS=vr,br,wd +FDIS=vr,br,wd,lDf,ec,bf,st +FDR +FK +FLID=string+FMDL? +FMFR? +FREV? Response Value Function and Description+FCFR +FPOLL +FVOICE Class 2.0 Command Set +FBS?+FCC=vr,br,w +FCO +FDT +FIS=vr,br,wd +FLI=stringTpr,idr,nsr +FNS=string +FPI=stringDCE +FRQ=pgl,cbl HEX +FCICSI ID A0-BF +FNCNSC FIF +FNF +FNS NSS FIF+FPI CIG ID Extended Fax AT Command Set Modem will wait for DC2 at the beginning of every #Pstring No DialTone No Carrier Busy Field Description SnnnnPstring Flow Control String Error Level Fax Reception from a BBSConnect Init AT&FX7S0=1#B1+FCLASS=6 ExtrnMail ZyXEL errorlevel AT Command Set Summaries Basic AT Command SetCommand Options Function & Description 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 Command Function & Description +Ref Status Registers & Result CodesRegister Descriptions 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=? Result Code Options ATXn Result Code Option Table+nnn Supported Connect Strings for Error Corrected Connections Result Code Field DescriptionsField Name Possible Values Numerical Verbose 24000 Status Registers & Result Codes Diagnostics & Troubleshooting DiagnosticsDiagnostics & 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 Upgrading Your Modem Upgrading by Flash EpromType ATUPXenter Upgrading Your Modem Kernel Recovery Mode Terminal Pinouts Terminal BlocksTIP Terminal Pinouts Pin/Signal Direction Description PC Serial Port PinoutsSigna Name Macintosh Serial Port Pinouts Mac Modem Description Din Terminal Pinouts Index Index Smartdrv