Jay, You asked: > I am trying to find the DTMF transmitter specifications for USA. I am most interested > in the level output and the twist. Can anyone tell me where to find this? > >Thanks! > >Jay D. Hall >[email protected]
You should be able to find what you're looking for (& more) about DTMF in the following docs: EIA/TIA 464A, Section 4.6.2 EIA-470-A, Section 4.3.2 These docs may be dated, so get the current versions. Best regards, Ron Pickard [email protected]
