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One of the following IRQs needs to be free: 3, 4, 5, or 7 (or 9 if you have a Winmodem). If there are no IRQ settings free in this range, you need to move a device off of one of these IRQs, in order to free it for use byOne of the following IRQs needs to be free: 3, 4, 5, or 7 (or 9 if you have a Winmodem). If there are no IRQ settings free in this range, you need to move a device off of one of these IRQs, in order to free it for use by your modem. We recommend removing other modems or disabling COM ports that may be using one of these IRQs.your modem. We recommend removing other modems or disabling COM ports that may be using one of these IRQs.# After you have made these changes, reinstall the modem using the instructions in the "Installation Guide". Once your modem is properly installed, make sure you have the correct COM port and IRQ settings in your software and/or in the Windows Device Manager.# After you have made these changes, reinstall the modem using the instructions in the "Installation Guide". Once your modem is properly installed, make sure you have the correct COM port and IRQ settings in your software and/or in the Windows Device Manager.POSSIBLE SOLUTION If you are using an external modem, the COM port may not be enabled. Refer to your computer’s manual forinformation about enabling COM ports. This usually involves altering the bios settings, motherboard jumpers,and the operating system. POSSIBLE SOLUTION You may be using the wrong serial cable with your external modem. Make sure you are using an RS-232 modemcable. You will need to make sure you are using a 25-pin male to 25-pin female, if your COM port is a 25-pinport or a 25-pin male to 9-pin female, if your COM port is a 9-pin port. PROBLEM The modem will not go off hook to dial or does not answer the phone.POSSIBLE SOLUTIONIf you have an external modem, you may be using the wrong power adapter for your modem. Use only the poweradapter that came with your modem. POSSIBLE SOLUTION You may have plugged your modem’s phone cord into a digital line. Plugging your modem’s phone cord into adigital phone line can damage the modem. Call your phone company if you are unsure whether or not your phoneline is digital.Page 6 POSSIBLE SOLUTION You may have plugged your modem’s phone cord into the wrong socket on the modem. Make sure the phonecord is plugged into a socket labelled with the word TELCO (marked with a wall socket icon on externals).POSSIBLE SOLUTIONYou might have a bad phone cord connection to your modem. The phone cord should be plugged into theTELCO socket on the modem (marked with a wall socket icon on externals) and the wall phone socket. Thephone cord should be no longer than 12 feet in length. Use the phone cord included with your modem if possible. POSSIBLE SOLUTION Your phone socket may have been wired incorrectly. Contact your telephone company. Ask them to make surethe tip and ring are on the outside pair of wires. POSSIBLE SOLUTION You may have devices between the modem and the wall phone socket. There should be no line splitters, faxmachines, or other devices between the modem and the phone wall socket. POSSIBLE SOLUTION You may have a poor line connection. Place the call again. Calls are routed differently each time. POSSIBLE SOLUTION If you have voice mail, your dial tone may be altered because messages are waiting. Retrieve your voice mailmessages to restore your normal dial tone. POSSIBLE SOLUTION Your software may not have auto answer enabled. Enable the auto answer feature. In your communicationsoftware’s terminal mode, type ATS0=1 and press ENTER.You need to enable auto answer before every session unless you alter your software’s initialization string topermanently enable auto answer. PROBLEM Both modems sound like they are exchanging carrier signals, but fail to establish a connection.POSSIBLE SOLUTIONYou may have a poor line connection. Place the call again. Calls are routed differently each time. POSSIBLE SOLUTION Your phone wall socket may have been wired incorrectly. Contact your telephone company. Ask them to makesure the tip and ring are on the outside pair of wires. PROBLEM Your 56K* modem cannot achieve a 56K Internet connection. POSSIBLE SOLUTION This modem is capable of 56 Kbps downloads. However, the download speeds you experience may be lower dueto varying line conditions and other factors. Uploads from users to server equipment travel at speeds up to 31.2Kbps. An analogue phone line compatible with the ITU V.90 standard or 3Com U.S. Robotics proprietary 56Ktechnology, and an Internet provider or corporate host site with the ITU V.90 standard or 3Com U.S. Roboticsproprietary 56K technology are necessary for these high-speed downloads. Check http://www.3com.com/56k fora list of ISPs that observe the ITU V.90 standard and/or offer 3Com’s proprietary 56K technology. POSSIBLE SOLUTION The phone lines in your area may not be 56K compatible. Call your phone company to find out if your phone lineis compatible with the ITU standard for 56K and/or is compatible with 3Com’s proprietary 56K technology. POSSIBLE SOLUTION You may have devices between the modem and the phone wall socket. There should be no line splitters, faxmachines, or other devices between the modem and the phone wall socket. PROBLEM Errors are constantly occurring in your V.17 fax transmissions. POSSIBLE SOLUTION Your modem initialization string may be insufficient for fax transmissions. In terminal mode, type the followinginitialization string: AT&F&H3&I2&R2S7=90 and then press ENTER. POSSIBLE SOLUTION There may be a Terminate and Stay Resident (TSR) program (such as a screen saver or virus scanner) running inthe background, disrupting data communications. Disable any Terminate and Stay Resident (TSR) programsrunning in the background. If you have software running as a TSR, check the software’s manual for informationabout 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, or4800. POSSIBLE SOLUTION You may be trying to fax a compressed file. Decompress the file using the application with which it wascompressed. Then open it in the application with which it was created. Select your fax software as the printer andthen print the file. PROBLEM Your communications software fails to initialize the modem. POSSIBLE SOLUTION Your software’s port settings may be incorrect. Make sure the software’s port settings match those for yourmodem. POSSIBLE SOLUTION If you are using an external modem, make sure the modem is plugged in and turned on. Use only the poweradapter included with the modem. The power switch is located on the top of the external case. The CS light onthe front panel should be lit. An internal modem should turn on automatically when the computer is turned on. PROBLEM If Plug and Play does not detect your modem. You have installed the modem and Windows hasrestarted, but you see only your normal desktop. You do not see any screens indicating newhardware has been detected.POSSIBLE SOLUTION The Plug and Play installation was not successful. Try the following:# Click Windows 95 Start and click Shut Down.# When asked if you wish to shut down your computer, click Yes.# When Windows 95 indicates that it is safe to turn off your computer, turn it off# Wait 15 seconds before turning the computer back on.# Windows 95 may detect your modem upon this restart, even if it did not detect the modem during the initial installation. If you see screens indicating that new hardware has been detected by Windows 95, follow the on-screeninstruction to install the modem. If you do not see the new hardware screens, continue with step 6.# Click Windows 95 Start# Point to Settings# Click Control Panel.# Double-click the System icon.# Click the Device Manager tab on the “System Properties” screen.# Look for “Other Devices” or “Unknown Devices” in the list that appears. If you do not see either of these options in the list, please contact technical support.• If you do see one of these options, double-click the option and continue with step 12. # If the description that appears matches the modem you are trying to install, click Remove.# Click OK when Windows asks if you wish to remove the device.# Restart the computer and continue with the on-screen instructions. If the computer does not detect the modem after this second restart, please contact technical support. PROBLEM A software application displays a screen reading that it cannot find or initialize the modem. POSSIBLE SOLUTION If you have a Winmodem, check with the software’s manufacturer to determine whether or not the software isfully Windows-based. Some software runs in Windows but has DOS components. Such software will not workwith Winmodems. If Plug and Play Does Not Detect Your Modem Try the following: 1. Click Windows 95 Start and click Shut Down. When asked if you wish to shut down your computer,click Yes. When Windows 95 indicates that it is safe to turn off your computer, turn it off and wait 15seconds. Then turn the computer back on. Windows 95 may detect your modem upon this restarteven if it did not detect the modem during the initial installation. If you see screens indicating thatnew hardware has been detected by Windows 95, turn to “Installing the Modem Drivers withWindows 95”. If not, continue with the next step. 2. Click Windows 95 Start, point to Settings, and click Control Panel. Double-click the System iconand then click the Device Manager tab on the “System Properties” screen. Look for “Other Devices”or “Unknown Devices” in the list that appears. If you do not see either of these options in the list,continue with the next section to learn about our support options. If you do see one of these options,double-click the option. If the description that appears matches the modem you are trying to install,click Remove. Click OK when Windows asks if you wish to remove the device. Next, restart thecomputer as described in step 1 on this page. If the computer does not detect the modem after thissecond restart, please refer to our support options.