3 ms·

Not to mention the fact that telephone lines are bandlimited at about 3000 Hz.

• wmf 12y ago
  That only applies to voice calls, not DSL.
  • quink 12y ago
    It does apply if you've got a pair gain system sitting in the middle, but you're essentially right.
  • te_platt 12y ago
    It applies to any call outside of the local loop. From the dsl wikipedia entry: Because DSL operates above the 3.4 kHz voice limit, it cannot pass through a load coil. Load coils are, in essence, filters that block out any non-voice frequency. They are commonly set at regular intervals in lines placed only for POTS service. A DSL signal cannot pass through a properly installed and working load coil, while voice service cannot be maintained past a certain distance without such coils. Therefore, some areas that are within range for DSL service are disqualified from eligibility because of load coil placement. Because of this, phone companies endeavor to remove load coils on copper loops that can operate without them, and by conditioning other lines to avoid them through the use of fiber to the neighborhood or node