The major reason that upload speeds tend to be far lower is that they are the lowest part of the spectrum on a cable network. As everything on a shared cable ne

The major reason that upload speeds tend to be far lower is that they are the lowest part of the spectrum on a cable network. As everything on a shared cable network is receiving everything else, encryption and noise filters are imperative. The higher the frequency of your noise, the more likely it is to cause issues on the rest of the hardware. There are high-pass filters all over the coax network to ensure that nothing over a certain frequency is able to get out on the network and screw things up for other customers. In order to expand the bandwidth by making the coax frequency pie larger, CATV providers would not only need to replace everybodys equipment to ensure it could handle the increased noise but also check every single meter of cable to find and remove all the high-pass filters.