56 Kbps modem technology (2)
Before switching to 56K modem we should take into account that:
- only the best phone lines (with the lowest noise level) can handle 56-Kbps transmission. According to analysts, only 50% of US connections are clean enough
- Some ISPs need to upgrade their connections to carrier phone networks
- If lines are not pure digital and additional conversions take place, 56 K cannot be obtained.
- There is also legal limit on speed: an FCC regulation dating back 20 years does not allow for higher modem transmission than 53.3 Kbps