On a related note, for those with really bad Infinitum service, the Telcel wireless cell modem can be a good option if fiber is not available or too $$$.
Telmex - not Telcel - "can" provide one at n/c....IF one goes in and makes a good enough case, that the Infinitum is really bad.... thus saving the 2500 pesos purchase price.
The setup process is a bit of a pain, the registration does not work via a Windows PC, one must use a cell phone, found this out the hard way....
However, it does work well, serves 5 devices, has both WiFi and ethernet connections, is only 399 pesos / month, and 10 meg download speed is the minimum, so streaming video is no issue at all. Uploads are more than fast enough as well.