3Com 1.024.1644-00 manual Possible Solution

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Troubleshooting

PROBLEM: Errors are constantly occurring in your V.17 fax transmissions.

POSSIBLE SOLUTION

Your modem initialisation string may be insufficient for fax transmissions. In terminal mode, type the following initialisation string: AT&F&H3&I2&R2S7=90 and then press ENTER. The standard string for faxing is AT&F1S36=0

POSSIBLE SOLUTION

There may be a Terminate and Stay Resident (TSR) program (such as a screen saver or virus scanner) running in the background, disrupting data communications. Disable any Terminate and Stay Resident (TSR) programs running in the background. If you have software running as a TSR, check the software’s manual for information about disabling its ability to operate as a TSR.

POSSIBLE SOLUTION

Your baud rate may be set too high. In your communications software, lower the baud rate to 9600, 7200, or 4800.

POSSIBLE SOLUTION

You may be trying to fax a compressed file. Decompress the file using the application with which it was compressed. Then open it in the application with which it was created. Select your fax software as the printer and then print the file.

PROBLEM: Your communications software fails to initialise the modem.

POSSIBLE SOLUTION

Your software’s port settings may be incorrect. Make sure the software’s port settings match those for your modem.

POSSIBLE SOLUTION

Make sure the modem is turned on. An internal modem should turn on automatically when the computer is turned on.

36 56K Voice Faxmodem Internal - User’s Guide

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Contents 56K Voice Faxmodem Internal Page Table of Contents Page Table of Contents Page Welcome to 56K*Information Access Product Features Back Channel Link Rates Upload Speeds Flash ROM Upgradable Determining Available Resources Control PanelDetermining Your Version of Windows Click PropertiesWindows 95 version Plug and Play Installation How to Prepare for Plug and Play InstallationHow to Insert the Modem into the Computer Serial NumberPage Page Page Page Installing Modem Drivers With Windows Versions 950 and 950a Moving Through the New Hardware Found ScreensPage COM Port Click More Info… Installing Modem Drivers With Windows Version 950b Using the Update Device Driver Wizard ScreensPage COM Port Click More Info… Word about COM Ports and IRQs How to Change the Modem’s Settings Page How to Insert the Modem into the Computer Page Page Page Page Restart Now Software Installation WindowsType of Modem Initialisation StringFlow Control Possible Solution Read This First Troubleshooting Possible Solution Possible Solution Possible Solution Troubleshooting Possible Solution Support Resources Are You Still Having Problems? Support ResourcesAnalogue loopback Analogue signalsAnswer mode ApplicationGlossary Binary digit bit Glossary Auto dialBaud rate Bit rateCharacters per second CPS Data modeGlossary Character Class 1Digital signals DefaultDetect phase GlossaryFacsimile Glossary Error controlFax mode Flow controlNonvolatile memory Nvram Local echoModem OFF/ON hookParity Originate modeGlossary Online fallback/fall forward ProtocolStart/stop bits Terminal modeSerial transmission Terminal32 bis 22 bis27ter See online fall back/fall forwardYmodem 42 bisXmodem Ymodem GTechnical Reference Dials the specified phone number, includes the following Technical ReferenceITU-T answer sequence En Sets local echoDisplays the following information Ln Controls speaker volume internals onlyTechnical Reference Hn Controls ON/OFF hook Mn Operates speakerNumeric codes Verbal codesTechnical Reference Sets result code displayed, default is 11/RINGINGTechnical Reference An Enables/disables additional result code subsets see Xn Resets modemDisplays a list of ampersand & commands Cn Controls Carrier Detect CD signalSets Guard Tone Fn Loads a read-only non-programmable factory configurationKn Enables/disables data compression Hn Sets Transmit Data TD flow control see also &Rn300 bps Sets pulse rotary dial make/break ratio No restrictions on the minimum speed for Wn Writes current configuration to Nvram templates Yn Sets break handling64 56K Voice Faxmodem Internal User’s Guide Register Default Function RegistersDefault Function Bit Value ResultTechnical Reference Register Default Function S13Timer S27 See the instructions for S13 S34 Bit Fax Commands +FCLASS=n Sets the mode of operation+FTH=n +FRH=nDisplayed As a number Words Description Regulatory CE ComplianceLimited Warranty