I think he means kbps not KB/s so 50,000kbps = ~50Mbps or 6.25 MB/sec which makes more sense.
Instead of posting your cfg just use the default cfg from the arma wiki.
your dsl's ping might be a problem, more so then the cfg. With only 5-10 people on a dedi or non-dedi default cfg will work. Unless you make missions that would make NASA's server sweat...
And make sure your ports are open.
incoming ports:
port UDP (used for game)
port+1 UDP (used for server reporting)
port+3 UDP (used for VoN transmissions)
Following outgoing ports need to be open as well:
port UDP (used for game)
port+3 UDP (used for VoN transmissions)
Default value of port is 2302, but you may change it by -port command line argument.