44 ms·
Phone lines operate at way above 5V, so you'd need some level shifting at least.
by foldr 3y ago
Phone lines operate at way above 5V, so you'd need some level shifting at least.
- mtve 3y ago9V battery was enough for two modems to communicate back-to-back, without dial tone or ringing signals, just "ATD" command on one and "ATA" on another.