My modem is a Motorola SB6120. my router is not the issue - I get the same results by connecting the modem directly to my pc and bypassing the router. Also, I seriously doubt that my uplink channel is any where near saturated... I have an upload bandwidth of 20mbps (tested) and when I do an NNTP download my upload pipe never uses even 1mbps.. I don't use bit torrent or other p2p protocols which could saturate the upload pipe. I have not tested ftp - that would be an interesting test. And btw, my router is NOT using any QOS
if you are 105/20 and you are maxing out your downlink for extended periods, I would not be shocked to find you are falling into the congestion management system, but there is no way to be sure of that from your end.
Have you tried several different concurrent download sources? As many as needed to fill the pipe? -- My place : »www.schettino.us