LANCOM 3850 UMTS
Chapter 9: Troubleshooting
81
EN
One common problem occurs when large amounts of data are sent and recei-
ved simultaneously with a Windows PC using an asynchronous connection.
This can cause a severe decrease in download speed. The cause of this pro-
blem is what is known as the TCP/IP receive window size of the Windows ope-
rating system that is set to a value too small for asynchronous connections.
Instructions on how to increase the Windows size can be found in the Know-
ledge Base of the support section of the LANCOM web site (
9.4
Unwanted connections under Windows XP
Windows XP computers attempt to compare their clocks with a timeserver on
the Internet at start-up. This is why when a Windows XP in the WLAN is star-
ted, a connection to the Internet is established by the LANCOM.
To resolve this issue, you can turn off the automatic time synchronization on
the Windows XP computers under
Right mouse click on the time of day
Properties
Internet time
.
