According to my information a tone detector shall recognize a dialtone of 2 seconds with a level between 80mV and 2 Vrms with frequencies between 340 Hz and 550 Hz (T11-03 pt 3.7.2 dd 4 sep 1991).
note that this voltage is applied through a 600 Ohm series resistor and the actual voltage at your modem is depending on it's impedance . Hope this can help regards Marc Decre Duane J. Marcroft wrote: > TREG'rs, > > I don't have the latest TE approval specifications for Holland. Could > > someone confirm the Dutch require a modem to detect a dialtone signal > at 2 > volts rms. NET 4 has a voltage much lower than this. > > The DAA is connected to a codec with a 3.3 V. supply and we are having > a > problem detecting a 2V rms dialtone signal. A signal this large > overloads > the codec front end. > > Any help provided would be appreciated. > > Thank you in advance. > > Regards, > > Duane
