Lancom Systems 3550 - Manual (Page 74)

LANCOM 3550 Wireless
࡯ Chapter 9: Troubleshooting
74
EN
9.3 DSL data transfer is slow
The data transfer rate of an broadband (Internet) DSL connection is dependent
upon numerous factors, most of which are outside of one's own sphere of
influence. Important factors aside from the bandwidth of one's own Internet
connection are the Internet connection and current load of the desired target.
Numerous other factors involving the Internet itself can also influence the
transfer rate.
Increasing the TCP/IP window size under Windows
If the actual transfer rate of a DSL connection is significantly below the fastest
rate listed by the provider, there are only a few possible causes (apart from the
above-mentioned external factors) which may involve one's own equipment.
One common problem occurs when large amounts of data are sent and
received simultaneously with a Windows PC using an asynchronous connec-
tion. This can cause a severe decrease in download speed. The cause of this
problem is what is known as the TCP/IP receive window size of the Windows
operating system that is set to a value too small for asynchronous connec-
tions.
Instructions on how to increase the Windows size can be found in the Knowl-
edge Base of the support section of the LANCOM web site (
www.lancom-
systems.com ).
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
started, 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.