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ZyXEL Communications U-336SA user manual Kernel Recovery Mode

Models: U-336S U-336SA

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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 the D/V button while turning on the modem, then release the button after 5 seconds.

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.

3.Repeat steps 1 through 9 from the previous directions above to upload a file that contains the valid firmware for your modem.

Upgrading Your Modem 141

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ZyXEL Communications U-336SA user manual Kernel Recovery Mode

Contents

ZyXEL ZyXEL Limited Warranty Acknowledgments FCC Part 15 InformationCopyright 1999 by ZyXEL Information for Canadian Users Page ∙ E-mail Contacting ZyXELVii Viii Contents LCD Panel Operation Leased Line Operation Fax Operation Upgrading Your Modem Page Required Equipment IntroductionStandard Features Modem FeaturesIntelligent Features Fax Compatibility Technical Specifications∙ Audio Monitor programmable volume control Introduction Front Panel InstallationU-336SA Front Panel Front Panel LEDsRear Panel Markings Front Panel Switches∙ EIA-232D Modem ConnectionU-336S Modem Connections Idle Screen Powering UpBasic Modem Operation Understanding AT CommandsUsing the Windows 95 Hyper Terminal Program Dialing and Answering Techniques Dialing using the ATD Command+++ ATH Auto-Answer and Hook ControlsATS0=n ATS0=0ATV0 ATV1 Quick Tips when issuing AT CommandsCommand Description AT Command Set/Type Example Viewing S Register Values Modem Result CodesChanging S Register Values Non-Volatile MemoryDialing Stored Phone Numbers Saving Settings and User ProfilesStoring Phone Numbers Helpful Hints for PC Computers ZyXEL Serial/Parallel I/O Card Default Modem Settings for PC’sAT Command Description Mac Software Tips Special AT Command Settings for MacHelpful Hints for Mac Computers Mac Serial PortSerial Cable Basic Modem Settings for UnixHelpful Hints for UNIX-Based Computers Unix Software Tips Basic Modem Operation LCD Panel LCD Panel Operation2LA Panel OperationInformation Example 2LOLED Status Screen Menu TreeDouble Arrows on The Screen DialingStoring a Number Dial MemoryDialing a Number View and Store a NumberATD ATA Manual DialATD Atdl Repeat Last DialAuto Answer ATHDialing Messages Disconnecting On-line Status Screen On-line Status Screen Display Unit/MeaningOn-line Status Screen Display Unit On OFF Status Display UnitMIN MAX DISCONNECTING……Panel Lock Syntax Command with Description Parameters 25bis Command SetClock Options RTS Options Command State OptionsDialing from Synchronous Mode Manual Answer Answering from Synchronous ModeAuto-Answer Leased Line Operation Connecting to a Leased LinePower Level Setting AT-Command DescriptionAT*M0 Manual ConnectAuto Handshake Aborting from Leased-Line OperationTerminating a Leased Line Connection Leased Line Operation Levels of Security Special FunctionsSecurity Functions User Passwords Command Function AT*Wab Remote ConfigurationAT*Rab Caller Number Delivery Caller ID Ring Here is an example Distinctive Ring Type Bit on Ring Sequence Extended Distinctive Ring EDR S51 Bit-mapped register default Bits Bin Dec Description Setting Up EDRCID/EDR RD RD EDR EDR Application ExampleBits Bin Dec Description Report Ring six times Special Functions Special Functions Fax Basics Fax OperationITU-T T.30 Fax Protocol Modem as Fax MachineDefining the Fax Command Sets Fax Command sets+FTH=MOD Class 1 Command SetCommand Value Description +FTM=MODCommand Syntax Description Class 2 Command Set+FCON +FBADLIN=+FBUF? Fax Operation +FMDL? +FDR+FK +FREV? +FMFR?+FPHCTO= +FCFR Command Value Description Enable pollingClass 2 Command Responses Value Function and Description +FVOICE Class 2.0 Command SetResponse Value Function and Description +FPOLL+FCO +FBS?+FKS +FDT+FIP +FMR? +FMI?+FMM? HEX DCE+FCICSI ID +FNS A0-BF+FNC +FNF+FVO Extended Fax AT Command Set+FTI ID TSISet the modem into V17G3 FAX mode same function #Pstring Field Description DISCONNECT1 Flow ControlDISCONNECT0 Fax Reception from a BBS Connect String Error LevelCommand Options Function & Description AT Command Set SummariesBasic AT Command Set AT Command Set Summaries AT Command Set Summaries UPX Description of ATI2 OutputOutput Output Value Description Parameter Data Type DescriptionAT Command Set Summaries DTE/DCE Extended AT& Command SetAT Command Set Summaries AT Command Set Summaries AT Command Set Summaries AT Command Set Summaries AT Command Set Summaries Extended AT* Command Set AT Command Set Summaries AT Command Set Summaries AT Command Set Summaries AT Command Set Summaries Basic S-Registers ATSn=x Command Function & Description +RefStatus Registers & Result Codes Register DescriptionsExtended S-Registers ATSn=x Command Bit Dec Hex Function and descriptionStatus Registers & Result Codes Status Registers & Result Codes Status Registers & Result Codes Speed detection ATX1 ATX2 ATX3 ATX4 Status Registers & Result Codes Status Registers & Result Codes Status Registers & Result Codes Status Registers & Result Codes ATA Status Registers & Result Codes Status Registers & Result Codes Status Registers & Result Codes Status Registers & Result Codes Status Registers & Result Codes +FCLASS=? ATXn Result Code Option Table Result Code Options@ $ Lapm Result Code Field DescriptionsField Name Possible Values NONE, ARQNumerical Verbose Connect Strings for Error Corrected ConnectionsPower-On Self Test Diagnostics TroubleshootingDiagnostics Resetting The Modem Loopback Tests Local Digital Loopback Test AT&T3 Line Condition Status Display Indicator LightsReceived Signal Power Level RX Count of the local modems requests to change the rate AT Command Set Problems Trouble ShootingCommand Echo Problems Answer Problems Data Transfer Problems Dialing ProblemsConnection Problems Upgrading by Flash Eprom Upgrading Your ModemKernel Recovery Mode PC Serial Port Pinouts Connector PinoutsPhone Jack Pinouts Connector Pinouts Mac Modem Description Din Macintosh Serial Port PinoutsConnector Pinouts Index Basics ITU-T T.30 fax protocol, 64 Using Modem as FaxSerial cable Software tips