"Uhm, DSL & Cable modems connect with 10baseT ethernet cords. Thats less bandwith than Airport, correct? The "Highest level" of business class DSL is only 1Mbps here I think. Even having multiple users at the same time won't crows airport. Because they all share the same cable/dsl connection."
Not mine. The bottleneck in my home network is the router box. When I plug my iMac straight into the cable modem, Network Utility shows a change in the connection speed from 10Mbps to 100Mbps.
(tig)
That just means that your cable modem has a 100 Mbps Ethernet port, vs your router's 10 Mbps Ethernet ports. This in no way means, however, that you have a 100Mbps connection to the internet. If you want to test your bandwith, a good web-based test is at:
http://webservices.cnet.com/Bandwidth/
For example, I did that test right now and got about 1.2 Mbps, which is in line with that I've seen with other bandwidth test tools. (I'm currently connected via Airport to a D-Link Wi-Fi router connected to my cable modem).
Actually, I've run the same test (or a similar one), and I get about the same as you down, about 200-300kbps up. I guess what I was trying to say (not very clearly
There are other considerations as well, at least on my hacked-together home network. Sometimes transfer speeds between my local machines bog down for no apparent reason. I thought it was my router, but I've since obtained a second one, and it still happens.
Ah, technology has made my life SO much easier...
(tig)