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Evaluating Symptoms and Solutions 89
Calls continue to reconnect or
calls do not timeout and
disconnect.
An application or LAN device is
sending IP packets.
Enable NetBIOS filtering. To do so, access the LAN
Parameters screen and click the box to enable
NetBIOS filtering. When this box is checked, NetBIOS
packets are prevented from initiating an outgoing call,
but they will be passed if the call is already
established. NetBIOS filtering is disabled by default.
Set the workgroup of all attached PCs to
WORKGROUP in the Network control panel.
Or, turn off Microsoft’s print/file sharing or use
NetBEUI for local service (that is, within the LAN). To
turn off print/file sharing, from Control Panel select
Network and then the Configuration tab. Click the File
and Print Sharing button. Clear both check boxes and
then click OK.
Make sure that the timeout value is not set to “0”.
Check the timeouts configured for the 56K LAN
Modem as explained in “Changing Data Call
Parameters” in Chapter 5.
Drop the call via the Manual Calling screen, wait for
the spurious call to be re-connected, and check the
Current Call Information from the Statistics page for
the Reason for call coming up
.
If the situation persists, disconnect each attached
LAN device to locate the source of the IP packet
generation.
Or you can turn off Automatic Call Initiation, located
on each service provider parameter page.
Some application software
does not work properly
The application may have an
embedded IP address, which
causes a problem when NAT is
enabled on the LAN Modem.
If you have a static network, disable NAT and try the
application again.
A complete list of applications tested for use with the
LAN Modem is located at
http://www.remoteaccess.3com.com/support/d
ocs/lanmodem/documentation/interop.html
Unable to connect at 56Kbps 56K may not be supported by
your remote server
In order to take advantage of 56K-based analog
connections, your remote server (such as an ISP) must
support 56K technology. To locate a 56K-enabled ISP
in your area, visit http://www.3com.com/56K.
FCC limitations Current FCC rules restrict the power output of a Service
Provider’s modems, limiting download speeds to
53Kbps.
Poor line conditions Check with your telephone company to ensure
maximum clarity exists for your telephone line.
(continued)
Table 8 Symptoms, Causes, and Solutions
Symptom Possible Cause Solution