From: "Rene Debets" <[email protected]> Subject: RE: Dialtone Detection for Netherlands Approval
Dear Duane T11 series of specification is still in effect. Might be TBR21 soon. T11 still requires 2V rms (open circuit) for dialtone and 1V (again open circuit) for Busy tone detection. Into 6oo ohms the above numbers are 1Vrms (2.2dBm) and 0.5Vrms (-3.8dBm) so that is not so bad. Wouldn't you want to have a bit of headroom for V.34 or the like anyway? I had the impression that the transmit side of things is a lot more difficult at 3.3V compared to the receive side. All this was as of four weeks ago. Regards, Rene ---------- From: [email protected] on behalf of Duane J. Marcroft Sent: Wednesday, October 22, 1997 7:30 PM To: [email protected] Subject: Dialtone Detection for Netherlands Approval 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
