Lancom 800+ User Manual

Also see for 800+: Installation guide

Contents

Lancom 800+ User Manual Manual pdf 72 page image

LANCOM 800+ – LANCOM DSL/I- 10+ – LANCOM DSL/I- 1611 Office Chapter 9: Troubleshooting72EN9.2 DSL data transfer is slowThe data transfer rate of an broadband (Internet) DSL connection is dependentupon numerous factors, most of which are outside of one's own sphere ofinfluence. Important factors aside from the bandwidth of one's own Internetconnection are the Internet connection and current load of the desired target.Numerous other factors involving the Internet itself can also influence thetransfer rate.Increasing the TCP/IP window size under WindowsIf the actual transfer rate of a DSL connection is significantly below the fastestrate listed by the provider, there are only a few possible causes (apart from theabove-mentioned external factors) which may involve one's own equipment.One common problem occurs when large amounts of data are sent andreceived simultaneously with a Windows PC using an asynchronous connec-tion. This can cause a severe decrease in download speed. The cause of thisproblem is what is known as the TCP/IP receive window size of the Windowsoperating 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.de).9.3 Unwanted connections under Windows XPWindows XP computers attempt to compare their clocks with a timeserver onthe Internet at start-up. This is why when a Windows XP in the WLAN isstarted, a connection to the Internet is established by the LANCOM.To resolve this issue, you can turn off the automatic time synchronization onthe Windows XP computers under Right mouse click on the time of day Properties Internet time.