Keep in mind a source might be T1 or T3 but they might be sharing their upload bandwidth amongst a very large no. of people. (Too many slots.) So it depends on your luck sometimes as to how good a speed you can get from a high calibre source connection.) I've been downlding some large files over last few weeks from a single source (cable/dsl) at speeds I'm happy with & yet they only show a 2 star connection quality. (I seem to reconnect to them very easily despite that. Either thru a manual search or direct connecting or browsing indirectly or directly.)

3 MB (megabits not megabytes!!!) DSL will be approx. 3 Mbits/8=375 KBytes/s - overhead (20 to 25%) = 285 to 300 KB/s approx. (KiloBytes)