3com 3C886 Manual De Usuario

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 

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 

.

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