TROUBLE.TXT file
3Com Corporation
3Com Megahertz LAN + Modem PC Card (3CXEM556 PC Card family)
Troubleshooting
Always check the 3Com Website at http:/www.3com.com for the
latest information regarding the 3CXEM556. To get to support,
click the Support button and select either "file downloads"
or "support documentation".
TABLE OF CONTENTS
---------------------------------------------------------------
Windows 95B (OSR 2)
---------------------------------------------------------------
1. Adapter did not install correctly, is not attaching to the
network, or modem is not functioning
2. SETUP.EXE fails to complete
3. Card fails to install properly or will not connect to
the network
4. Card is not detected
5. Unable to create multiple configurations
6. On a Fujitsu 655TX, sound is distorted while using the
modem
7. Card fails to install or function correctly
---------------------------------------------------------------
Windows 95
---------------------------------------------------------------
8. Card did not install correctly, is not attaching to the
network, or modem is not functioning
9. SETUP.EXE fails to complete
10. In several Texas Instruments (TI) series notebooks running
Phoenix Card Services, the system will lock up during
setup
11. Card is not detected
12. When installing from floppy disk on certain Toshiba
laptops, setup cannot read Installation Disk #2
13. Card fails to install or function correctly
---------------------------------------------------------------
Windows NT 4.0
---------------------------------------------------------------
14. The 3CXEM556 LAN + 56K Modem Card Doesn’t Install or Work
Correctly under Windows NT 4.0
---------------------------------------------------------------
DOS
---------------------------------------------------------------
15. AutoLink Hangs Without Completing
16. Cannot Connect to the Network Using TI 600CD, TI650CD,
TI900, Micron, NEC Versa 6000 Series, or Other Notebooks
17. Error "Unable to configure the card"
18. System Fails to Run and Computer Must Be Rebooted when
trying to run CONFIG on NEC 6030H and NEC6030X
Cardbus Machines
19. Enabling Full Duplex
---------------------------------------------------------------
Windows 98 and Windows NT 5.0
---------------------------------------------------------------
20. For Your Information
---------------------------------------------------------------
General Hardware Troubleshooting Tips
---------------------------------------------------------------
21. If the Card Diagnostic Tests in CONFIG.EXE Run Smoothly
---------------------------------------------------------------
General Modem Troubleshooting Tips
---------------------------------------------------------------
22. Loopback Tests
23. If You are Using Quicken Version 6
24. Receiving Faxes in ProComm Plus
25. Using Automatic Credit Card Dialing
26. If You Don't Use Error Correction or Data Compression
27. Where is the Script file for XXXXX?
28. You can't achieve 56K or 53.3K connections
29. You Can't Get a 33,600bps Connection
30. Adjusting the Dialtone Volume
-----------------------------------------------------------------
CELLULAR
-----------------------------------------------------------------
31. The Modem Won't Work
32. You Can't Hear Modem Noises During Dialing and Connection
33. The Cellular Phone Keeps Turning Off
34. Dial-up Networking Won't Work With Cellular
35. CRC Errors or Dropped Connections
---------------------------------------------------------------
RAPIDCOMM VOICE
---------------------------------------------------------------
36. You Get the Message "Wrong Token Error 1001"
37. Monitor Function Doesn't Work
38. Auto Detect Won't Work
===============================================================
===============================================================
Windows 95B (OSR 2)
---------------------------------------------------------------
1. Adapter did not install correctly, is not attaching to the
network, or modem is not functioning
Many times this is due to a faulty installation of some sort.
Run UNINSTAL.EXE from the Installation CD and run SETUP.EXE
again. If this doesn't work, run UNINSTAL.EXE and install
using the Plug and Play method.
---------------------------------------------------------------
2. SETUP.EXE fails to complete
Reboot to see if the installation will complete. If not, run
UNINSTAL.EXE and reinstall using the Plug and Play method
described in the manual and W95NDIS3.TXT file.
---------------------------------------------------------------
3. Card fails to install properly or will not connect to
the network
Install the card into a different slot in the Laptop.
---------------------------------------------------------------
4. Card is not detected, but PCMCIA controllers are installed
and working. Other cards function correctly. If I go to
Control Panel/PC CARD, the 3Com Megahertz adapter appears
with a yellow question mark or modem or other symbol than a
multi-function adapter (white diamond).
The 3Com Network Adapter has been misinstalled. Run UNINSTAL.EXE
from the Installation CD and run SETUP.EXE again. If this
doesn't work, run UNINSTAL.EXE and install using the Plug and
Play method.
---------------------------------------------------------------
5. Unable to create multiple configurations with one portion
of the card disabled and the other enabled in Device
Manager
This feature is not supported for this card.
---------------------------------------------------------------
6. On a Fujitsu 655TX, sound is distorted while using the
modem
Enter the computer's BIOS and under "Audio Features" change
the I/O address to "Disabled" (the sound will still function
in Windows 95).
---------------------------------------------------------------
7. Card fails to install or function correctly
Install the card in another PC card slot.
---------------------------------------------------------------
Windows 95
---------------------------------------------------------------
8. Card did not install correctly, is not attaching to the
network, or modem is not functioning
Many times this is due to a faulty installation. Run
UNINSTAL.EXE and then run SETUP.EXE again. If this doesn't
work, run UNINSTAL.EXE and install using the Plug and Play
method.
---------------------------------------------------------------
9. SETUP.EXE fails to complete
Reboot to see if the installation will complete. If not, run
UNINSTALL.EXE and reinstall using the Plug and Play method.
---------------------------------------------------------------
10. In several Texas Instruments (TI) series notebooks running
Phoenix Card Services, the system will lock up during
setup
The card can usually be set up on these machines by removing
Phoenix Card Services and placing the machine in PCIC or
compatible mode. Contact Acer (Acer currently supports the TI
Laptop line) for more information on how to accomplish this.
For additional information, refer to either Acer’s or 3Com’s
Web site.
---------------------------------------------------------------
11. Card is not detected, but my PCMCIA controllers are
installed and working. Other Cards function correctly. If
I go to Control Panel/PC CARD, the 3Com Megahertz card
appears with a yellow question mark or modem or other
symbol than a white diamond (signifying a multi-function
card)
The 3Com Network card has not installed correctly. Run
UNINSTAL.EXE from the Installation CD and then run SETUP.EXE
again. If this doesn't work, run UNINSTAL.EXE and install
using the Plug and Play method.
---------------------------------------------------------------
12. When installing from floppy disk on certain Toshiba
laptops, setup cannot read Installation Disk #2. It may
return an "Invalid Disk!" error message
To use certain Toshiba laptops with multiple disks, you may
need to replace file
C:\WINDOWS\SYSTEM\IOSUBSYS\HSFLOP.PDR
with a new one from Toshiba. This information and the required
replacement file should be on the Toshiba Web site.
---------------------------------------------------------------
13. Card fails to install or function correctly
Install the card in another slot.
---------------------------------------------------------------
Windows NT 4.0
---------------------------------------------------------------
14. The 3CXEM556 doesn’t install or work properly under
Windows NT 4.0
Service Pack 3 or above must be applied with NT 4.0 for the
3CXEM556 LAN+Modem card to work correctly.
NOTE: Some laptop vendors have custom versions of Service Pack
3. If you have Service Pack 3 installed and still have
problems, we recommend using Microsoft's Service Pack 3.
See Microsoft's Web site.
---------------------------------------------------------------
DOS
---------------------------------------------------------------
15. AutoLink Hangs Without Completing
Remove SMARTDRV.EXE from the AUTOEXEC.BAT file.
---------------------------------------------------------------
16. TI 600CD, TI650CD, TI900, Micron, NEC Versa 6000 series, or
other laptops cannot connect to the network
Use a different interrupt such as 5, 7, or 11. Use one of the
following commands in the AUTOEXEC.BAT file to change the
interrupt:
EMENABLE /IRQ=5
EMENABLE /IRQ=7
EMENABLE /IRQ=B
You may also need to increase the memory exclusion on the
EMM386.EXE line in the CONFIG.SYS file to something like this:
DEVICE=C:\DOS\EMM386.EXE X=D000-DFFF
If you are using Phoenix Card and Socket Services for DOS, edit
the PCM.INI in the Phoenix Card Services directory to include
IRQ 5 and exclude IRQs 3 and 4.
---------------------------------------------------------------
17. Error "Unable to configure the card"
Change the Plug and Play entry in the BIOS to OFF.
---------------------------------------------------------------
18. When trying to run CONFIG on an NEC 6030H and NEC6030X
cardbus machine, the system fails to run and the computer
must be rebooted
You should still be able to connect to your network. See item
15 above, and use IRQ 11.
---------------------------------------------------------------
19. Enabling Full Duplex
----------------
DOS:
In file C:\NWCLIENT\NET.CFG, add the keyword:
full duplex
under the [LINK DRIVER] section.
-----------------
WFW:
In file C:\WFW\PROTOCOL.INI, add the keyword:
fullduplex
under the [NWLINK] section.
-----------------
LANMANAGER:
In file C:\LANMAN.DOS\PROTOCOL.INI, add the keyword:
full_duplex=yes
under the [EM556N2_NIF] section.
-----------------
IBM DOS Lan Server:
In file C:\NET\PROTOCOL.INI, add the keyword:
full_duplex=yes
under the [IBM$NETBEUI] section.
---------------------------------------------------------------
Windows 98 and Windows NT 5.0
---------------------------------------------------------------
20. For Your Information
At the time of this release of the LAN + 56K Modem card,
Windows 98 and Windows NT 5.0 were not available and are not
currently supported. We suggest you use a plug and play
installation.
As Windows 98 and Windows NT 5.0 become available, check the
3Com web site at http://www.3com.com for information on using
the LAN + 56K Modem card.
---------------------------------------------------------------
General Hardware Troubleshooting Tips
---------------------------------------------------------------
21. If the card diagnostic tests in CONFIG.EXE run smoothly,
the problem may not be the card. Check the following:
CONFIG.EXE
----------
- Make sure the card is operating in a computer containing
Personal Computer Memory Card International Association
(PCMCIA) Release 2.01, Type II or Type III slots. Usually,
CONFIG.EXE will work best on an INTEL PCIC or compatible
controller.
- Make sure the card is completely seated in its slot. Review
the installation instructions.
- Make sure your computer is running DOS 3.1 or higher, and
no device drivers or memory managers are loaded.
DOS 6.22
--------------
Reboot and click F5 when the message "Starting MS-DOS"
appears on the screen.
Windows 95
--------------
Reboot and press F8 when the message "Starting Windows 95"
appears on the screen. The Windows 95 boot menu should then
appear. Select "Safe Mode Command Prompt Only" (usually
option 7).
- Inspect all cables and connections. Try the laptop at a known
good port. For twisted pair, attach the card directly to the
hub or switch. If this works, there is probably an intermediate
wiring problem. Contact your System Administrator.
- If you are running the Echo Server test, make sure the card is
securely connected to a properly cabled network and an echo
server is set up on the network.
- If you are configuring the I/O base address or interrupt request
level, make sure the settings you choose for these parameters do
not conflict with any other peripheral device or software
program installed in the computer.
- Make sure the configuration setting for the transceiver type is
correct.
- The computer in which the card is installed might be defective.
Install the card in a known functioning computer and run the
tests again.
- Replace the failed card with a known working card with the
same configuration. If the second card fails, something is
probably wrong with the test environment, not with the card.
---------------------------------------------------------------
General Modem TroubleShooting Tips
---------------------------------------------------------------
22. Loopback Tests
The following loopback AT commands are not supported: Local
Analog Loopback (AT&T8), Remote Analog Loopback (AT&T1, Local
Digital Loopback (AT&T6), and Remote Digital Loopback (AT&T3).
---------------------------------------------------------------
23. If You are Using Quicken Version 6
The default maximum baud rate of a modem in Quicken 6 is
19,200bps. Follow the instructions in the Quicken 6 manual to
increase this baud rate for your Megahertz modem.
---------------------------------------------------------------
24. Receiving Faxes in ProComm Plus
The auto-answer detect feature of ProComm Plus does not work
with your 3CXEM556 series modem. Turn auto-answer detect off.
---------------------------------------------------------------
25. Using Automatic Credit Card Dialing
When you enter the dial string for a credit card call, place an
ampersand (&) at the end of the phone number, before the
credit card number.
---------------------------------------------------------------
26. If You Don't Use Error Correction or Data Compression
To enhance performance when not using error correction or data
compression, set S24=64.
---------------------------------------------------------------
27. Where is the Script file for XXXXX?
There are several script files included on Installation CD.
Check WWW.3COM.COM for more available Script files. If you are
unable to find one for your communications software, check with
the vendor or the vendor's Web site for a script file.
---------------------------------------------------------------
28. You can't achieve 56K or 53.3K connections
The maximum rate currently allowed by the FCC is 53.3K. You can
only achieve these by connecting to a compatible 56K protocol.
Your speed may be limited by the number of different nodes
between your modem and your ISP.
----------------------------------------------------------------
29. You Can't Get a 33,600bps Connection
Your modem connect speed of 33,600bps is defaulted OFF. To
enable a 33,600bps connection, set S33=0. Also, connection
and data transfer rates will be dependent on several factors
including (but not limited to) the type of modem you are connecting
to and the amount of line noise.
----------------------------------------------------------------
30. Adjusting the Dialtone Volume
Your modem is designed to support only one dialtone volume. It
cannot be changed.
-----------------------------------------------------------------
CELLULAR
-----------------------------------------------------------------
31. The Modem Won't Work
Your cellular phone battery may be low. Insert a fully powered
battery.
---------------------------------------------------------------
32. You Can't Hear Modem Noises During Dialing and Connection
Your 3CXEM556 series modem is designed not to produce audio
until a connection is being negotiated.
---------------------------------------------------------------
33. The Cellular Phone Keeps Turning Off
The modem is designed to turn off the cellular phone whenever
the modem power is turned off.
---------------------------------------------------------------
34. Dial-up Networking Won't Work With Cellular
Windows 95 OSR 2 has a feature in the Control Panel under the
Power icon (PC-Card Modems tab) called "Turn off PC-Card
modems when not in use" that must be disabled during dial-up
networking. This should allow you to hear the beep-up tones
when the modem is inserted and active, and to use dial-up
networking.
---------------------------------------------------------------
35. CRC Errors or Dropped Connections
In cellular or data mode, if you are experiencing CRC errors or
dropped connections, turn off "Selective Reject" in V.42 by
issuing ATS27=64.
---------------------------------------------------------------
RAPIDCOMM VOICE
---------------------------------------------------------------
36. You Get the Message "Wrong Token Error 1001"
This error occurs when a greeting or auxiliary message is
recorded when calling in remotely to RapidComm Voice without
pressing pound (#) following the recording.
---------------------------------------------------------------
37. Monitor Function Doesn't Work
Dual functionality of modem and LAN does not support the
monitor function at this time.
---------------------------------------------------------------
38. Auto Detect Won't Work
Auto Detect doesn't work when set to Voice/Data/Fax when
receiving a fax from some modems. The default setting for
RapidComm Voice Auto Detect that is shipped with your modem
is set to Data/Fax, so Auto Detect should work.
(%VER Troubleshooting v5.56.1)
Download Driver Pack
After your driver has been downloaded, follow these simple steps to install it.
Expand the archive file (if the download file is in zip or rar format).
If the expanded file has an .exe extension, double click it and follow the installation instructions.
Otherwise, open Device Manager by right-clicking the Start menu and selecting Device Manager.
Find the device and model you want to update in the device list.
Double-click on it to open the Properties dialog box.
From the Properties dialog box, select the Driver tab.
Click the Update Driver button, then follow the instructions.
Very important: You must reboot your system to ensure that any driver updates have taken effect.
For more help, visit our Driver Support section for step-by-step videos on how to install drivers for every file type.